man POSIX () - Perl interface to IEEE Std 1003.1

NAME

POSIX - Perl interface to IEEE Std 1003.1

SYNOPSIS

    use POSIX;
    use POSIX qw(setsid);
    use POSIX qw(:errno_h :fcntl_h);

    printf "EINTR is %d\n", EINTR;

    $sess_id = POSIX::setsid();

    $fd = POSIX::open($path, O_CREAT|O_EXCL|O_WRONLY, 0644);
        # note: that's a filedescriptor, *NOT* a filehandle

DESCRIPTION

The POSIX module permits you to access all (or nearly all) the standard POSIX 1003.1 identifiers. Many of these identifiers have been given Perl-ish interfaces.

Everything is exported by default with the exception of any POSIX functions with the same name as a built-in Perl function, such as CWabs, CWalarm, CWrmdir, CWwrite, etc.., which will be exported only if you ask for them explicitly. This is an unfortunate backwards compatibility feature. You can stop the exporting by saying CWuse POSIX () and then use the fully qualified names (ie. CWPOSIX::SEEK_END).

This document gives a condensed list of the features available in the POSIX module. Consult your operating system's manpages for general information on most features. Consult perlfunc for functions which are noted as being identical to Perl's builtin functions.

The first section describes POSIX functions from the 1003.1 specification. The second section describes some classes for signal objects, TTY objects, and other miscellaneous objects. The remaining sections list various constants and macros in an organization which roughly follows IEEE Std 1003.1b-1993.

NOTE

The POSIX module is probably the most complex Perl module supplied with the standard distribution. It incorporates autoloading, namespace games, and dynamic loading of code that's in Perl, C, or both. It's a great source of wisdom.

CAVEATS

A few functions are not implemented because they are C specific. If you attempt to call these, they will print a message telling you that they aren't implemented, and suggest using the Perl equivalent should one exist. For example, trying to access the setjmp() call will elicit the message setjmp() is C-specific: use eval {} instead.

Furthermore, some evil vendors will claim 1003.1 compliance, but in fact are not so: they will not pass the PCTS (POSIX Compliance Test Suites). For example, one vendor may not define EDEADLK, or the semantics of the errno values set by open(2) might not be quite right. Perl does not attempt to verify POSIX compliance. That means you can currently successfully say use POSIX, and then later in your program you find that your vendor has been lax and there's no usable ICANON macro after all. This could be construed to be a bug.

FUNCTIONS

_exit

This is identical to the C function CW_exit(). It exits the program immediately which means among other things buffered I/O is not flushed. Note that when using threads and in Linux this is not a good way to exit a thread because in Linux processes and threads are kind of the same thing (Note: while this is the situation in early 2003 there are projects under way to have threads with more POSIXly semantics in Linux). If you want not to return from a thread, detach the thread.

abort

This is identical to the C function CWabort(). It terminates the process with a CWSIGABRT signal unless caught by a signal handler or if the handler does not return normally (it e.g. does a CWlongjmp).

abs

This is identical to Perl's builtin CWabs() function, returning the absolute value of its numerical argument.

access

Determines the accessibility of a file.

        if( POSIX::access( "/", &POSIX::R_OK ) ){
                print "have read permission\n";
        }

Returns CWundef on failure. Note: do not use CWaccess() for security purposes. Between the CWaccess() call and the operation you are preparing for the permissions might change: a classic race condition.

acos

This is identical to the C function CWacos(), returning the arcus cosine of its numerical argument. See also Math::Trig.

alarm

This is identical to Perl's builtin CWalarm() function, either for arming or disarming the CWSIGARLM timer.

asctime

This is identical to the C function CWasctime(). It returns a string of the form

        "Fri Jun  2 18:22:13 2000\n\0"

and it is called thusly

        $asctime = asctime($sec, $min, $hour, $mday, $mon, $year,
                           $wday, $yday, $isdst);

The CW$mon is zero-based: January equals CW0. The CW$year is 1900-based: 2001 equals CW101. The CW$wday, CW$yday, and CW$isdst default to zero (and the first two are usually ignored anyway).

asin

This is identical to the C function CWasin(), returning the arcus sine of its numerical argument. See also Math::Trig.

assert

Unimplemented, but you can use die in perlfunc and the Carp module to achieve similar things.

atan

This is identical to the C function CWatan(), returning the arcus tangent of its numerical argument. See also Math::Trig.

atan2

This is identical to Perl's builtin CWatan2() function, returning the arcus tangent defined by its two numerical arguments, the y coordinate and the x coordinate. See also Math::Trig.

atexit

atexit() is C-specific: use CWEND {} instead, see perlsub.

atof

atof() is C-specific. Perl converts strings to numbers transparently. If you need to force a scalar to a number, add a zero to it.

atoi

atoi() is C-specific. Perl converts strings to numbers transparently. If you need to force a scalar to a number, add a zero to it. If you need to have just the integer part, see int in perlfunc.

atol

atol() is C-specific. Perl converts strings to numbers transparently. If you need to force a scalar to a number, add a zero to it. If you need to have just the integer part, see int in perlfunc.

bsearch

bsearch() not supplied. For doing binary search on wordlists, see Search::Dict.

calloc

calloc() is C-specific. Perl does memory management transparently.

ceil

This is identical to the C function CWceil(), returning the smallest integer value greater than or equal to the given numerical argument.

chdir

This is identical to Perl's builtin CWchdir() function, allowing one to change the working (default) directory, see chdir in perlfunc.

chmod

This is identical to Perl's builtin CWchmod() function, allowing one to change file and directory permissions, see chmod in perlfunc.

chown

This is identical to Perl's builtin CWchown() function, allowing one to change file and directory owners and groups, see chown in perlfunc.

clearerr

Use the method CWIO::Handle::clearerr() instead, to reset the error state (if any) and EOF state (if any) of the given stream.

clock

This is identical to the C function CWclock(), returning the amount of spent processor time in microseconds.

close

Close the file. This uses file descriptors such as those obtained by calling CWPOSIX::open.

        $fd = POSIX::open( "foo", &POSIX::O_RDONLY );
        POSIX::close( $fd );

Returns CWundef on failure. See also close in perlfunc.

closedir

This is identical to Perl's builtin CWclosedir() function for closing a directory handle, see closedir in perlfunc.

cos

This is identical to Perl's builtin CWcos() function, for returning the cosine of its numerical argument, see cos in perlfunc. See also Math::Trig.

cosh

This is identical to the C function CWcosh(), for returning the hyperbolic cosine of its numeric argument. See also Math::Trig.

creat

Create a new file. This returns a file descriptor like the ones returned by CWPOSIX::open. Use CWPOSIX::close to close the file.

        $fd = POSIX::creat( "foo", 0611 );
        POSIX::close( $fd );

See also sysopen in perlfunc and its CWO_CREAT flag.

ctermid

Generates the path name for the controlling terminal.

        $path = POSIX::ctermid();

ctime

This is identical to the C function CWctime() and equivalent to CWasctime(localtime(...)), see asctime and localtime.

cuserid

Get the login name of the owner of the current process.

        $name = POSIX::cuserid();

difftime

This is identical to the C function CWdifftime(), for returning the time difference (in seconds) between two times (as returned by CWtime()), see time.

div

div() is C-specific, use int in perlfunc on the usual CW/ division and the modulus CW%.

dup

This is similar to the C function CWdup(), for duplicating a file descriptor. This uses file descriptors such as those obtained by calling CWPOSIX::open. Returns CWundef on failure.

dup2

This is similar to the C function CWdup2(), for duplicating a file descriptor to an another known file descriptor. This uses file descriptors such as those obtained by calling CWPOSIX::open. Returns CWundef on failure.

errno

Returns the value of errno.

        $errno = POSIX::errno();

This identical to the numerical values of the CW$!, see $ERRNO in perlvar.

execl

execl() is C-specific, see exec in perlfunc.

execle

execle() is C-specific, see exec in perlfunc.

execlp

execlp() is C-specific, see exec in perlfunc.

execv

execv() is C-specific, see exec in perlfunc.

execve

execve() is C-specific, see exec in perlfunc.

execvp

execvp() is C-specific, see exec in perlfunc.

exit

This is identical to Perl's builtin CWexit() function for exiting the program, see exit in perlfunc.

exp

This is identical to Perl's builtin CWexp() function for returning the exponent (e-based) of the numerical argument, see exp in perlfunc.

fabs

This is identical to Perl's builtin CWabs() function for returning the absolute value of the numerical argument, see abs in perlfunc.

fclose

Use method CWIO::Handle::close() instead, or see close in perlfunc.

fcntl

This is identical to Perl's builtin CWfcntl() function, see fcntl in perlfunc.

fdopen

Use method CWIO::Handle::new_from_fd() instead, or see open in perlfunc.

feof

Use method CWIO::Handle::eof() instead, or see eof in perlfunc.

ferror

Use method CWIO::Handle::error() instead.

fflush

Use method CWIO::Handle::flush() instead. See also $OUTPUT_AUTOFLUSH in perlvar.

fgetc

Use method CWIO::Handle::getc() instead, or see read in perlfunc.

fgetpos

Use method CWIO::Seekable::getpos() instead, or see seek in L.

fgets

Use method CWIO::Handle::gets() instead. Similar to <>, also known as readline in perlfunc.

fileno

Use method CWIO::Handle::fileno() instead, or see fileno in perlfunc.

floor

This is identical to the C function CWfloor(), returning the largest integer value less than or equal to the numerical argument.

fmod

This is identical to the C function CWfmod().

        $r = fmod($x, $y);

It returns the remainder CW$r = $x - $n*$y, where CW$n = trunc($x/$y). The CW$r has the same sign as CW$x and magnitude (absolute value) less than the magnitude of CW$y.

fopen

Use method CWIO::File::open() instead, or see open in perlfunc.

fork

This is identical to Perl's builtin CWfork() function for duplicating the current process, see fork in perlfunc and perlfork if you are in Windows.

fpathconf

Retrieves the value of a configurable limit on a file or directory. This uses file descriptors such as those obtained by calling CWPOSIX::open. The following will determine the maximum length of the longest allowable pathname on the filesystem which holds CW/var/foo.

        $fd = POSIX::open( "/var/foo", &POSIX::O_RDONLY );
        $path_max = POSIX::fpathconf( $fd, &POSIX::_PC_PATH_MAX );

Returns CWundef on failure.

fprintf

fprintf() is C-specific, see printf in perlfunc instead.

fputc

fputc() is C-specific, see print in perlfunc instead.

fputs

fputs() is C-specific, see print in perlfunc instead.

fread

fread() is C-specific, see read in perlfunc instead.

free

free() is C-specific. Perl does memory management transparently.

freopen

freopen() is C-specific, see open in perlfunc instead.

frexp

Return the mantissa and exponent of a floating-point number.

        ($mantissa, $exponent) = POSIX::frexp( 1.234e56 );

fscanf

fscanf() is C-specific, use <> and regular expressions instead.

fseek

Use method CWIO::Seekable::seek() instead, or see seek in perlfunc.

fsetpos

Use method CWIO::Seekable::setpos() instead, or seek seek in perlfunc.

fstat

Get file status. This uses file descriptors such as those obtained by calling CWPOSIX::open. The data returned is identical to the data from Perl's builtin CWstat function.

        $fd = POSIX::open( "foo", &POSIX::O_RDONLY );
        @stats = POSIX::fstat( $fd );

fsync

Use method CWIO::Handle::sync() instead.

ftell

Use method CWIO::Seekable::tell() instead, or see tell in perlfunc.

fwrite

fwrite() is C-specific, see print in perlfunc instead.

getc

This is identical to Perl's builtin CWgetc() function, see getc in perlfunc.

getchar

Returns one character from STDIN. Identical to Perl's CWgetc(), see getc in perlfunc.

getcwd

Returns the name of the current working directory. See also Cwd.

getegid

Returns the effective group identifier. Similar to Perl' s builtin variable CW$(, see $EGID in perlvar.

getenv

Returns the value of the specified enironment variable. The same information is available through the CW%ENV array.

geteuid

Returns the effective user identifier. Identical to Perl's builtin CW$> variable, see $EUID in perlvar.

getgid

Returns the user's real group identifier. Similar to Perl's builtin variable CW$), see $GID in perlvar.

getgrgid

This is identical to Perl's builtin CWgetgrgid() function for returning group entries by group identifiers, see getgrgid in perlfunc.

getgrnam

This is identical to Perl's builtin CWgetgrnam() function for returning group entries by group names, see getgrnam in perlfunc.

getgroups

Returns the ids of the user's supplementary groups. Similar to Perl's builtin variable CW$), see $GID in perlvar.

getlogin

This is identical to Perl's builtin CWgetlogin() function for returning the user name associated with the current session, see getlogin in perlfunc.

getpgrp

This is identical to Perl's builtin CWgetpgrp() function for returning the prcess group identifier of the current process, see getpgrp in perlfunc.

getpid

Returns the process identifier. Identical to Perl's builtin variable CW$$, see $PID in perlvar.

getppid

This is identical to Perl's builtin CWgetppid() function for returning the process identifier of the parent process of the current process , see getppid in perlfunc.

getpwnam

This is identical to Perl's builtin CWgetpwnam() function for returning user entries by user names, see getpwnam in perlfunc.

getpwuid

This is identical to Perl's builtin CWgetpwuid() function for returning user entries by user identifiers, see getpwuid in perlfunc.

gets

Returns one line from CWSTDIN, similar to <>, also known as the CWreadline() function, see readline in perlfunc. NOTE: if you have C programs that still use CWgets(), be very afraid. The CWgets() function is a source of endless grief because it has no buffer overrun checks. It should never be used. The CWfgets() function should be preferred instead.

getuid

Returns the user's identifier. Identical to Perl's builtin CW$< variable, see $UID in perlvar.

gmtime

This is identical to Perl's builtin CWgmtime() function for converting seconds since the epoch to a date in Greenwich Mean Time, see gmtime in perlfunc.

isalnum

This is identical to the C function, except that it can apply to a single character or to a whole string. Note that locale settings may affect what characters are considered CWisalnum. Does not work on Unicode characters code point 256 or higher. Consider using regular expressions and the CW/[[:alnum:]]/ construct instead, or possibly the CW/\w/ construct.

isalpha

This is identical to the C function, except that it can apply to a single character or to a whole string. Note that locale settings may affect what characters are considered CWisalpha. Does not work on Unicode characters code point 256 or higher. Consider using regular expressions and the CW/[[:alpha:]]/ construct instead.

isatty

Returns a boolean indicating whether the specified filehandle is connected to a tty. Similar to the CW-t operator, see -X in perlfunc.

iscntrl

This is identical to the C function, except that it can apply to a single character or to a whole string. Note that locale settings may affect what characters are considered CWiscntrl. Does not work on Unicode characters code point 256 or higher. Consider using regular expressions and the CW/[[:cntrl:]]/ construct instead.

isdigit

This is identical to the C function, except that it can apply to a single character or to a whole string. Note that locale settings may affect what characters are considered CWisdigit (unlikely, but still possible). Does not work on Unicode characters code point 256 or higher. Consider using regular expressions and the CW/[[:digit:]]/ construct instead, or the CW/\d/ construct.

isgraph

This is identical to the C function, except that it can apply to a single character or to a whole string. Note that locale settings may affect what characters are considered CWisgraph. Does not work on Unicode characters code point 256 or higher. Consider using regular expressions and the CW/[[:graph:]]/ construct instead.

islower

This is identical to the C function, except that it can apply to a single character or to a whole string. Note that locale settings may affect what characters are considered CWislower. Does not work on Unicode characters code point 256 or higher. Consider using regular expressions and the CW/[[:lower:]]/ construct instead. Do not use CW/[a-z]/.

isprint

This is identical to the C function, except that it can apply to a single character or to a whole string. Note that locale settings may affect what characters are considered CWisprint. Does not work on Unicode characters code point 256 or higher. Consider using regular expressions and the CW/[[:print:]]/ construct instead.

ispunct

This is identical to the C function, except that it can apply to a single character or to a whole string. Note that locale settings may affect what characters are considered CWispunct. Does not work on Unicode characters code point 256 or higher. Consider using regular expressions and the CW/[[:punct:]]/ construct instead.

isspace

This is identical to the C function, except that it can apply to a single character or to a whole string. Note that locale settings may affect what characters are considered CWisspace. Does not work on Unicode characters code point 256 or higher. Consider using regular expressions and the CW/[[:space:]]/ construct instead, or the CW/\s/ construct. (Note that CW/\s/ and CW/[[:space:]]/ are slightly different in that CW/[[:space:]]/ can normally match a vertical tab, while CW/\s/ does not.)

isupper

This is identical to the C function, except that it can apply to a single character or to a whole string. Note that locale settings may affect what characters are considered CWisupper. Does not work on Unicode characters code point 256 or higher. Consider using regular expressions and the CW/[[:upper:]]/ construct instead. Do not use CW/[A-Z]/.

isxdigit

This is identical to the C function, except that it can apply to a single character or to a whole string. Note that locale settings may affect what characters are considered CWisxdigit (unlikely, but still possible). Does not work on Unicode characters code point 256 or higher. Consider using regular expressions and the CW/[[:xdigit:]]/ construct instead, or simply CW/[0-9a-f]/i.

kill

This is identical to Perl's builtin CWkill() function for sending signals to processes (often to terminate them), see kill in perlfunc.

labs

(For returning absolute values of long integers.) labs() is C-specific, see abs in perlfunc instead.

ldexp

This is identical to the C function CWldexp() for multiplying floating point numbers with powers of two.

        $x_quadrupled = POSIX::ldexp($x, 2);

ldiv

(For computing dividends of long integers.) ldiv() is C-specific, use CW/ and CWint() instead.

link

This is identical to Perl's builtin CWlink() function for creating hard links into files, see link in perlfunc.

localeconv

Get numeric formatting information. Returns a reference to a hash containing the current locale formatting values. Here is how to query the database for the de (Deutsch or German) locale.

        $loc = POSIX::setlocale( &POSIX::LC_ALL, "de" );
        print "Locale = $loc\n";
        $lconv = POSIX::localeconv();
        print "decimal_point    = ", $lconv->{decimal_point},   "\n";
        print "thousands_sep    = ", $lconv->{thousands_sep},   "\n";
        print "grouping = ", $lconv->{grouping},        "\n";
        print "int_curr_symbol  = ", $lconv->{int_curr_symbol}, "\n";
        print "currency_symbol  = ", $lconv->{currency_symbol}, "\n";
        print "mon_decimal_point = ", $lconv->{mon_decimal_point}, "\n";
        print "mon_thousands_sep = ", $lconv->{mon_thousands_sep}, "\n";
        print "mon_grouping     = ", $lconv->{mon_grouping},    "\n";
        print "positive_sign    = ", $lconv->{positive_sign},   "\n";
        print "negative_sign    = ", $lconv->{negative_sign},   "\n";
        print "int_frac_digits  = ", $lconv->{int_frac_digits}, "\n";
        print "frac_digits      = ", $lconv->{frac_digits},     "\n";
        print "p_cs_precedes    = ", $lconv->{p_cs_precedes},   "\n";
        print "p_sep_by_space   = ", $lconv->{p_sep_by_space},  "\n";
        print "n_cs_precedes    = ", $lconv->{n_cs_precedes},   "\n";
        print "n_sep_by_space   = ", $lconv->{n_sep_by_space},  "\n";
        print "p_sign_posn      = ", $lconv->{p_sign_posn},     "\n";
        print "n_sign_posn      = ", $lconv->{n_sign_posn},     "\n";

localtime

This is identical to Perl's builtin CWlocaltime() function for converting seconds since the epoch to a date see localtime in perlfunc.

log

This is identical to Perl's builtin CWlog() function, returning the natural (e-based) logarithm of the numerical argument, see log in perlfunc.

log10

This is identical to the C function CWlog10(), returning the 10-base logarithm of the numerical argument. You can also use

    sub log10 { log($_[0]) / log(1) }

    sub log10 { log($_[0]) / 2.30258509299405 }

    sub log10 { log($_[0]) * 0.434294481903252 }

longjmp

longjmp() is C-specific: use die in perlfunc instead.

lseek

Move the file's read/write position. This uses file descriptors such as those obtained by calling CWPOSIX::open.

        $fd = POSIX::open( "foo", &POSIX::O_RDONLY );
        $off_t = POSIX::lseek( $fd, 0, &POSIX::SEEK_SET );

Returns CWundef on failure.

malloc

malloc() is C-specific. Perl does memory management transparently.

mblen

This is identical to the C function CWmblen(). Perl does not have any support for the wide and multibyte characters of the C standards, so this might be a rather useless function.

mbstowcs

This is identical to the C function CWmbstowcs(). Perl does not have any support for the wide and multibyte characters of the C standards, so this might be a rather useless function.

mbtowc

This is identical to the C function CWmbtowc(). Perl does not have any support for the wide and multibyte characters of the C standards, so this might be a rather useless function.

memchr

memchr() is C-specific, see index in perlfunc instead.

memcmp

memcmp() is C-specific, use CWeq instead, see perlop.

memcpy

memcpy() is C-specific, use CW=, see perlop, or see substr in perlfunc.

memmove

memmove() is C-specific, use CW=, see perlop, or see substr in perlfunc.

memset

memset() is C-specific, use CWx instead, see perlop.

mkdir

This is identical to Perl's builtin CWmkdir() function for creating directories, see mkdir in perlfunc.

mkfifo

This is similar to the C function CWmkfifo() for creating FIFO special files.

        if (mkfifo($path, $mode)) { ....

Returns CWundef on failure. The CW$mode is similar to the mode of CWmkdir(), see mkdir in perlfunc.

mktime

Convert date/time info to a calendar time. Synopsis:

        mktime(sec, min, hour, mday, mon, year, wday = 0, yday = 0, isdst = 0)

        $time_t = POSIX::mktime( 0, 30, 10, 12, 11, 95 );
        print "Date = ", POSIX::ctime($time_t);

Returns CWundef on failure.

modf

Return the integral and fractional parts of a floating-point number.

        ($fractional, $integral) = POSIX::modf( 3.14 );

nice

This is similar to the C function CWnice(), for changing the scheduling preference of the current process. Positive arguments mean more polite process, negative values more needy process. Normal user processes can only be more polite. Returns CWundef on failure.

offsetof

offsetof() is C-specific, you probably want to see pack in perlfunc instead.

open

Open a file for reading for writing. This returns file descriptors, not Perl filehandles. Use CWPOSIX::close to close the file. Open a file read-only with mode 0666.

        $fd = POSIX::open( "foo" );

Open a file for read and write.

        $fd = POSIX::open( "foo", &POSIX::O_RDWR );

Open a file for write, with truncation.

        $fd = POSIX::open( "foo", &POSIX::O_WRONLY | &POSIX::O_TRUNC );

Create a new file with mode 0640. Set up the file for writing.

        $fd = POSIX::open( "foo", &POSIX::O_CREAT | &POSIX::O_WRONLY, 0640 );

Returns CWundef on failure. See also sysopen in perlfunc.

opendir

Open a directory for reading.

        $dir = POSIX::opendir( "/var" );
        @files = POSIX::readdir( $dir );
        POSIX::closedir( $dir );

Returns CWundef on failure.

pathconf

Retrieves the value of a configurable limit on a file or directory. The following will determine the maximum length of the longest allowable pathname on the filesystem which holds CW/var.

        $path_max = POSIX::pathconf( "/var", &POSIX::_PC_PATH_MAX );

Returns CWundef on failure.

pause

This is similar to the C function CWpause(), which suspends the execution of the current process until a signal is received. Returns CWundef on failure.

perror

This is identical to the C function CWperror(), which outputs to the standard error stream the specified message followed by : and the current error string. Use the CWwarn() function and the CW$! variable instead, see warn in perlfunc and $ERRNO in perlvar.

pipe

Create an interprocess channel. This returns file descriptors like those returned by CWPOSIX::open.

        my ($read, $write) = POSIX::pipe();
        POSIX::write( $write, "hello", 5 );
        POSIX::read( $read, $buf, 5 );

See also pipe in perlfunc.

pow

Computes CW$x raised to the power CW$exponent.

        $ret = POSIX::pow( $x, $exponent );

You can also use the CW** operator, see perlop.

printf

Formats and prints the specified arguments to STDOUT. See also printf in perlfunc.

putc

putc() is C-specific, see print in perlfunc instead.

putchar

putchar() is C-specific, see print in perlfunc instead.

puts

puts() is C-specific, see print in perlfunc instead.

qsort

qsort() is C-specific, see sort in perlfunc instead.

raise

Sends the specified signal to the current process. See also kill in perlfunc and the CW$$ in $PID in perlvar.

rand

CWrand() is non-portable, see rand in perlfunc instead.

read

Read from a file. This uses file descriptors such as those obtained by calling CWPOSIX::open. If the buffer CW$buf is not large enough for the read then Perl will extend it to make room for the request.

        $fd = POSIX::open( "foo", &POSIX::O_RDONLY );
        $bytes = POSIX::read( $fd, $buf, 3 );

Returns CWundef on failure. See also sysread in perlfunc.

readdir

This is identical to Perl's builtin CWreaddir() function for reading directory entries, see readdir in perlfunc.

realloc

realloc() is C-specific. Perl does memory management transparently.

remove

This is identical to Perl's builtin CWunlink() function for removing files, see unlink in perlfunc.

rename

This is identical to Perl's builtin CWrename() function for renaming files, see rename in perlfunc.

rewind

Seeks to the beginning of the file.

rewinddir

This is identical to Perl's builtin CWrewinddir() function for rewinding directory entry streams, see rewinddir in perlfunc.

rmdir

This is identical to Perl's builtin CWrmdir() function for removing (empty) directories, see rmdir in perlfunc.

scanf

scanf() is C-specific, use <> and regular expressions instead, see perlre.

setgid

Sets the real group identifier and the effective group identifier for this process. Similar to assigning a value to the Perl's builtin CW$) variable, see $GID in perlvar, except that the latter will change only the real user identifier, and that the setgid() uses only a single numeric argument, as opposed to a space-separated list of numbers.

setjmp

CWsetjmp() is C-specific: use CWeval {} instead, see eval in perlfunc.

setlocale

Modifies and queries program's locale. The following examples assume

        use POSIX qw(setlocale LC_ALL LC_CTYPE);

has been issued. The following will set the traditional UNIX system locale behavior (the second argument CW"C").

        $loc = setlocale( LC_ALL, "C" );

The following will query the current LC_CTYPE category. (No second argument means 'query'.)

        $loc = setlocale( LC_CTYPE );

The following will set the LC_CTYPE behaviour according to the locale environment variables (the second argument CW""). Please see your systems CWsetlocale(3) documentation for the locale environment variables' meaning or consult perllocale.

        $loc = setlocale( LC_CTYPE, "" );

The following will set the LC_COLLATE behaviour to Argentinian Spanish. NOTE: The naming and availability of locales depends on your operating system. Please consult perllocale for how to find out which locales are available in your system.

        $loc = setlocale( LC_ALL, "es_AR.ISO8859-1" );

setpgid

This is similar to the C function CWsetpgid() for setting the process group identifier of the current process. Returns CWundef on failure.

setsid

This is identical to the C function CWsetsid() for setting the session identifier of the current process.

setuid

Sets the real user identifier and the effective user identifier for this process. Similar to assigning a value to the Perl's builtin CW$< variable, see $UID in perlvar, except that the latter will change only the real user identifier.

sigaction

Detailed signal management. This uses CWPOSIX::SigAction objects for the CWaction and CWoldaction arguments. Consult your system's CWsigaction manpage for details. Synopsis:

        sigaction(signal, action, oldaction = 0)

Returns CWundef on failure. The CWsignal must be a number (like SIGHUP), not a string (like SIGHUP), though Perl does try hard to understand you.

siglongjmp

siglongjmp() is C-specific: use die in perlfunc instead.

sigpending

Examine signals that are blocked and pending. This uses CWPOSIX::SigSet objects for the CWsigset argument. Consult your system's CWsigpending manpage for details. Synopsis:

        sigpending(sigset)

Returns CWundef on failure.

sigprocmask

Change and/or examine calling process's signal mask. This uses CWPOSIX::SigSet objects for the CWsigset and CWoldsigset arguments. Consult your system's CWsigprocmask manpage for details. Synopsis:

        sigprocmask(how, sigset, oldsigset = 0)

Returns CWundef on failure.

sigsetjmp

CWsigsetjmp() is C-specific: use CWeval {} instead, see eval in perlfunc.

sigsuspend

Install a signal mask and suspend process until signal arrives. This uses CWPOSIX::SigSet objects for the CWsignal_mask argument. Consult your system's CWsigsuspend manpage for details. Synopsis:

        sigsuspend(signal_mask)

Returns CWundef on failure.

sin

This is identical to Perl's builtin CWsin() function for returning the sine of the numerical argument, see sin in perlfunc. See also Math::Trig.

sinh

This is identical to the C function CWsinh() for returning the hyperbolic sine of the numerical argument. See also Math::Trig.

sleep

This is functionally identical to Perl's builtin CWsleep() function for suspending the execution of the current for process for certain number of seconds, see sleep in perlfunc. There is one significant difference, however: CWPOSIX::sleep() returns the number of unslept seconds, while the CWCORE::sleep() returns the number of slept seconds.

sprintf

This is similar to Perl's builtin CWsprintf() function for returning a string that has the arguments formatted as requested, see sprintf in perlfunc.

sqrt

This is identical to Perl's builtin CWsqrt() function. for returning the square root of the numerical argument, see sqrt in perlfunc.

srand

Give a seed the pseudorandom number generator, see srand in perlfunc.

sscanf

sscanf() is C-specific, use regular expressions instead, see perlre.

stat

This is identical to Perl's builtin CWstat() function for retutning information about files and directories.

strcat

strcat() is C-specific, use CW.= instead, see perlop.

strchr

strchr() is C-specific, see index in perlfunc instead.

strcmp

strcmp() is C-specific, use CWeq or CWcmp instead, see perlop.

strcoll

This is identical to the C function CWstrcoll() for collating (comparing) strings transformed using the CWstrxfrm() function. Not really needed since Perl can do this transparently, see perllocale.

strcpy

strcpy() is C-specific, use CW= instead, see perlop.

strcspn

strcspn() is C-specific, use regular expressions instead, see perlre.

strerror

Returns the error string for the specified errno. Identical to the string form of the CW$!, see $ERRNO in perlvar.

strftime

Convert date and time information to string. Returns the string. Synopsis:

        strftime(fmt, sec, min, hour, mday, mon, year, wday = -1, yday = -1, isdst = -1)

The month (CWmon), weekday (CWwday), and yearday (CWyday) begin at zero. I.e. January is 0, not 1; Sunday is 0, not 1; January 1st is 0, not 1. The year (CWyear) is given in years since 1900. I.e., the year 1995 is 95; the year 2001 is 101. Consult your system's CWstrftime() manpage for details about these and the other arguments. If you want your code to be portable, your format (CWfmt) argument should use only the conversion specifiers defined by the ANSI C standard (C89, to play safe). These are CWaAbBcdHIjmMpSUwWxXyYZ%. But even then, the results of some of the conversion specifiers are non-portable. For example, the specifiers CWaAbBcpZ change according to the locale settings of the user, and both how to set locales (the locale names) and what output to expect are non-standard. The specifier CWc changes according to the timezone settings of the user and the timezone computation rules of the operating system. The CWZ specifier is notoriously unportable since the names of timezones are non-standard. Sticking to the numeric specifiers is the safest route. The given arguments are made consistent as though by calling CWmktime() before calling your system's CWstrftime() function, except that the CWisdst value is not affected. The string for Tuesday, December 12, 1995.

        $str = POSIX::strftime( "%A, %B %d, %Y", 0, 0, 0, 12, 11, 95, 2 );
        print "$str\n";

strlen

strlen() is C-specific, use CWlength() instead, see length in perlfunc.

strncat

strncat() is C-specific, use CW.= instead, see perlop.

strncmp

strncmp() is C-specific, use CWeq instead, see perlop.

strncpy

strncpy() is C-specific, use CW= instead, see perlop.

strpbrk

strpbrk() is C-specific, use regular expressions instead, see perlre.

strrchr

strrchr() is C-specific, see rindex in perlfunc instead.

strspn

strspn() is C-specific, use regular expressions instead, see perlre.

strstr

This is identical to Perl's builtin CWindex() function, see index in perlfunc.

strtod

String to double translation. Returns the parsed number and the number of characters in the unparsed portion of the string. Truly POSIX-compliant systems set $! ($ERRNO) to indicate a translation error, so clear $! before calling strtod. However, non-POSIX systems may not check for overflow, and therefore will never set $!. strtod should respect any POSIX setlocale() settings. To parse a string CW$str as a floating point number use

    $! = 0;
    ($num, $n_unparsed) = POSIX::strtod($str);

The second returned item and $! can be used to check for valid input:

    if (($str eq '') || ($n_unparsed != 0) || $!) {
        die "Non-numeric input $str" . ($! ? ": $!\n" : "\n");
    }

When called in a scalar context strtod returns the parsed number.

strtok

strtok() is C-specific, use regular expressions instead, see perlre, or split in perlfunc.

strtol

String to (long) integer translation. Returns the parsed number and the number of characters in the unparsed portion of the string. Truly POSIX-compliant systems set $! ($ERRNO) to indicate a translation error, so clear $! before calling strtol. However, non-POSIX systems may not check for overflow, and therefore will never set $!. strtol should respect any POSIX setlocale() settings. To parse a string CW$str as a number in some base CW$base use

    $! = 0;
    ($num, $n_unparsed) = POSIX::strtol($str, $base);

The base should be zero or between 2 and 36, inclusive. When the base is zero or omitted strtol will use the string itself to determine the base: a leading 0x or 0X means hexadecimal; a leading 0 means octal; any other leading characters mean decimal. Thus, 1234 is parsed as a decimal number, 01234 as an octal number, and 0x1234 as a hexadecimal number. The second returned item and $! can be used to check for valid input:

    if (($str eq '') || ($n_unparsed != 0) || !$!) {
        die "Non-numeric input $str" . $! ? ": $!\n" : "\n";
    }

When called in a scalar context strtol returns the parsed number.

strtoul

String to unsigned (long) integer translation. strtoul() is identical to strtol() except that strtoul() only parses unsigned integers. See strtol for details. Note: Some vendors supply strtod() and strtol() but not strtoul(). Other vendors that do supply strtoul() parse -1 as a valid value.

strxfrm

String transformation. Returns the transformed string.

        $dst = POSIX::strxfrm( $src );

Used in conjunction with the CWstrcoll() function, see strcoll. Not really needed since Perl can do this transparently, see perllocale.

sysconf

Retrieves values of system configurable variables. The following will get the machine's clock speed.

        $clock_ticks = POSIX::sysconf( &POSIX::_SC_CLK_TCK );

Returns CWundef on failure.

system

This is identical to Perl's builtin CWsystem() function, see system in perlfunc.

tan

This is identical to the C function CWtan(), returning the tangent of the numerical argument. See also Math::Trig.

tanh

This is identical to the C function CWtanh(), returning the hyperbolic tangent of the numerical argument. See also Math::Trig.

tcdrain

This is similar to the C function CWtcdrain() for draining the output queue of its argument stream. Returns CWundef on failure.

tcflow

This is similar to the C function CWtcflow() for controlling the flow of its argument stream. Returns CWundef on failure.

tcflush

This is similar to the C function CWtcflush() for flushing the I/O buffers of its argument stream. Returns CWundef on failure.

tcgetpgrp

This is identical to the C function CWtcgetpgrp() for returning the process group identifier of the foreground process group of the controlling terminal.

tcsendbreak

This is similar to the C function CWtcsendbreak() for sending a break on its argument stream. Returns CWundef on failure.

tcsetpgrp

This is similar to the C function CWtcsetpgrp() for setting the process group identifier of the foreground process group of the controlling terminal. Returns CWundef on failure.

time

This is identical to Perl's builtin CWtime() function for returning the number of seconds since the epoch (whatever it is for the system), see time in perlfunc.

times

The times() function returns elapsed realtime since some point in the past (such as system startup), user and system times for this process, and user and system times used by child processes. All times are returned in clock ticks.

    ($realtime, $user, $system, $cuser, $csystem) = POSIX::times();

Note: Perl's builtin CWtimes() function returns four values, measured in seconds.

tmpfile

Use method CWIO::File::new_tmpfile() instead, or see File::Temp.

tmpnam

Returns a name for a temporary file.

        $tmpfile = POSIX::tmpnam();

For security reasons, which are probably detailed in your system's documentation for the C library tmpnam() function, this interface should not be used; instead see File::Temp.

tolower

This is identical to the C function, except that it can apply to a single character or to a whole string. Consider using the CWlc() function, see lc in perlfunc, or the equivalent CW\L operator inside doublequotish strings.

toupper

This is identical to the C function, except that it can apply to a single character or to a whole string. Consider using the CWuc() function, see uc in perlfunc, or the equivalent CW\U operator inside doublequotish strings.

ttyname

This is identical to the C function CWttyname() for returning the name of the current terminal.

tzname

Retrieves the time conversion information from the CWtzname variable.

        POSIX::tzset();
        ($std, $dst) = POSIX::tzname();

tzset

This is identical to the C function CWtzset() for setting the current timezone based on the environment variable CWTZ, to be used by CWctime(), CWlocaltime(), CWmktime(), and CWstrftime() functions.

umask

This is identical to Perl's builtin CWumask() function for setting (and querying) the file creation permission mask, see umask in perlfunc.

uname

Get name of current operating system.

        ($sysname, $nodename, $release, $version, $machine) = POSIX::uname();

Note that the actual meanings of the various fields are not that well standardized, do not expect any great portability. The CW$sysname might be the name of the operating system, the CW$nodename might be the name of the host, the CW$release might be the (major) release number of the operating system, the CW$version might be the (minor) release number of the operating system, and the CW$machine might be a hardware identifier. Maybe.

ungetc

Use method CWIO::Handle::ungetc() instead.

unlink

This is identical to Perl's builtin CWunlink() function for removing files, see unlink in perlfunc.

utime

This is identical to Perl's builtin CWutime() function for changing the time stamps of files and directories, see utime in perlfunc.

vfprintf

vfprintf() is C-specific, see printf in perlfunc instead.

vprintf

vprintf() is C-specific, see printf in perlfunc instead.

vsprintf

vsprintf() is C-specific, see sprintf in perlfunc instead.

wait

This is identical to Perl's builtin CWwait() function, see wait in perlfunc.

waitpid

Wait for a child process to change state. This is identical to Perl's builtin CWwaitpid() function, see waitpid in perlfunc.

        $pid = POSIX::waitpid( -1, POSIX::WNOHANG );
        print "status = ", ($? / 256), "\n";

wcstombs

This is identical to the C function CWwcstombs(). Perl does not have any support for the wide and multibyte characters of the C standards, so this might be a rather useless function.

wctomb

This is identical to the C function CWwctomb(). Perl does not have any support for the wide and multibyte characters of the C standards, so this might be a rather useless function.

write

Write to a file. This uses file descriptors such as those obtained by calling CWPOSIX::open.

        $fd = POSIX::open( "foo", &POSIX::O_WRONLY );
        $buf = "hello";
        $bytes = POSIX::write( $b, $buf, 5 );

Returns CWundef on failure. See also syswrite in perlfunc.

CLASSES

POSIX::SigAction

new

Creates a new CWPOSIX::SigAction object which corresponds to the C CWstruct sigaction. This object will be destroyed automatically when it is no longer needed. The first parameter is the fully-qualified name of a sub which is a signal-handler. The second parameter is a CWPOSIX::SigSet object, it defaults to the empty set. The third parameter contains the CWsa_flags, it defaults to 0.

        $sigset = POSIX::SigSet->new(SIGINT, SIGQUIT);
        $sigaction = POSIX::SigAction->new( \&main::handler, $sigset, &POSIX::SA_NOCLDSTOP );

This CWPOSIX::SigAction object is intended for use with the CWPOSIX::sigaction() function.

handler

mask

flags

accessor functions to get/set the values of a SigAction object.

        $sigset = $sigaction->mask;
        $sigaction->flags(&POSIX::SA_RESTART);

safe

accessor function for the safe signals flag of a SigAction object; see perlipc for general information on safe (a.k.a. deferred) signals. If you wish to handle a signal safely, use this accessor to set the safe flag in the CWPOSIX::SigAction object:

        $sigaction->safe(1);

You may also examine the safe flag on the output action object which is filled in when given as the third parameter to CWPOSIX::sigaction():

        sigaction(SIGINT, $new_action, $old_action);
        if ($old_action->safe) {
            # previous SIGINT handler used safe signals
        }

POSIX::SigSet

new

Create a new SigSet object. This object will be destroyed automatically when it is no longer needed. Arguments may be supplied to initialize the set. Create an empty set.

        $sigset = POSIX::SigSet->new;

Create a set with SIGUSR1.

        $sigset = POSIX::SigSet->new( &POSIX::SIGUSR1 );

addset

Add a signal to a SigSet object.

        $sigset->addset( &POSIX::SIGUSR2 );

Returns CWundef on failure.

delset

Remove a signal from the SigSet object.

        $sigset->delset( &POSIX::SIGUSR2 );

Returns CWundef on failure.

emptyset

Initialize the SigSet object to be empty.

        $sigset->emptyset();

Returns CWundef on failure.

fillset

Initialize the SigSet object to include all signals.

        $sigset->fillset();

Returns CWundef on failure.

ismember

Tests the SigSet object to see if it contains a specific signal.

        if( $sigset->ismember( &POSIX::SIGUSR1 ) ){
                print "contains SIGUSR1\n";
        }

POSIX::Termios

new

Create a new Termios object. This object will be destroyed automatically when it is no longer needed. A Termios object corresponds to the termios C struct. new() mallocs a new one, getattr() fills it from a file descriptor, and setattr() sets a file descriptor's parameters to match Termios' contents.

        $termios = POSIX::Termios->new;

getattr

Get terminal control attributes. Obtain the attributes for stdin.

        $termios->getattr()

Obtain the attributes for stdout.

        $termios->getattr( 1 )

Returns CWundef on failure.

getcc

Retrieve a value from the c_cc field of a termios object. The c_cc field is an array so an index must be specified.

        $c_cc[1] = $termios->getcc(1);

getcflag

Retrieve the c_cflag field of a termios object.

        $c_cflag = $termios->getcflag;

getiflag

Retrieve the c_iflag field of a termios object.

        $c_iflag = $termios->getiflag;

getispeed

Retrieve the input baud rate.

        $ispeed = $termios->getispeed;

getlflag

Retrieve the c_lflag field of a termios object.

        $c_lflag = $termios->getlflag;

getoflag

Retrieve the c_oflag field of a termios object.

        $c_oflag = $termios->getoflag;

getospeed

Retrieve the output baud rate.

        $ospeed = $termios->getospeed;

setattr

Set terminal control attributes. Set attributes immediately for stdout.

        $termios->setattr( 1, &POSIX::TCSANOW );

Returns CWundef on failure.

setcc

Set a value in the c_cc field of a termios object. The c_cc field is an array so an index must be specified.

        $termios->setcc( &POSIX::VEOF, 1 );

setcflag

Set the c_cflag field of a termios object.

        $termios->setcflag( $c_cflag | &POSIX::CLOCAL );

setiflag

Set the c_iflag field of a termios object.

        $termios->setiflag( $c_iflag | &POSIX::BRKINT );

setispeed

Set the input baud rate.

        $termios->setispeed( &POSIX::B9600 );

Returns CWundef on failure.

setlflag

Set the c_lflag field of a termios object.

        $termios->setlflag( $c_lflag | &POSIX::ECHO );

setoflag

Set the c_oflag field of a termios object.

        $termios->setoflag( $c_oflag | &POSIX::OPOST );

setospeed

Set the output baud rate.

        $termios->setospeed( &POSIX::B9600 );

Returns CWundef on failure.

Baud rate values

B38400 B75 B200 B134 B300 B1800 B150 B0 B19200 B1200 B9600 B600 B4800 B50 B2400 B110

Terminal interface values

TCSADRAIN TCSANOW TCOON TCIOFLUSH TCOFLUSH TCION TCIFLUSH TCSAFLUSH TCIOFF TCOOFF

c_cc field values

VEOF VEOL VERASE VINTR VKILL VQUIT VSUSP VSTART VSTOP VMIN VTIME NCCS

c_cflag field values

CLOCAL CREAD CSIZE CS5 CS6 CS7 CS8 CSTOPB HUPCL PARENB PARODD

c_iflag field values

BRKINT ICRNL IGNBRK IGNCR IGNPAR INLCR INPCK ISTRIP IXOFF IXON PARMRK

c_lflag field values

ECHO ECHOE ECHOK ECHONL ICANON IEXTEN ISIG NOFLSH TOSTOP

c_oflag field values

OPOST

PATHNAME CONSTANTS

Constants: _PC_CHOWN_RESTRICTED _PC_LINK_MAX _PC_MAX_CANON _PC_MAX_INPUT _PC_NAME_MAX _PC_NO_TRUNC _PC_PATH_MAX _PC_PIPE_BUF _PC_VDISABLE

POSIX CONSTANTS

Constants: _POSIX_ARG_MAX _POSIX_CHILD_MAX _POSIX_CHOWN_RESTRICTED _POSIX_JOB_CONTROL _POSIX_LINK_MAX _POSIX_MAX_CANON _POSIX_MAX_INPUT _POSIX_NAME_MAX _POSIX_NGROUPS_MAX _POSIX_NO_TRUNC _POSIX_OPEN_MAX _POSIX_PATH_MAX _POSIX_PIPE_BUF _POSIX_SAVED_IDS _POSIX_SSIZE_MAX _POSIX_STREAM_MAX _POSIX_TZNAME_MAX _POSIX_VDISABLE _POSIX_VERSION

SYSTEM CONFIGURATION

Constants: _SC_ARG_MAX _SC_CHILD_MAX _SC_CLK_TCK _SC_JOB_CONTROL _SC_NGROUPS_MAX _SC_OPEN_MAX _SC_PAGESIZE _SC_SAVED_IDS _SC_STREAM_MAX _SC_TZNAME_MAX _SC_VERSION

ERRNO

Constants: E2BIG EACCES EADDRINUSE EADDRNOTAVAIL EAFNOSUPPORT EAGAIN EALREADY EBADF EBUSY ECHILD ECONNABORTED ECONNREFUSED ECONNRESET EDEADLK EDESTADDRREQ EDOM EDQUOT EEXIST EFAULT EFBIG EHOSTDOWN EHOSTUNREACH EINPROGRESS EINTR EINVAL EIO EISCONN EISDIR ELOOP EMFILE EMLINK EMSGSIZE ENAMETOOLONG ENETDOWN ENETRESET ENETUNREACH ENFILE ENOBUFS ENODEV ENOENT ENOEXEC ENOLCK ENOMEM ENOPROTOOPT ENOSPC ENOSYS ENOTBLK ENOTCONN ENOTDIR ENOTEMPTY ENOTSOCK ENOTTY ENXIO EOPNOTSUPP EPERM EPFNOSUPPORT EPIPE EPROCLIM EPROTONOSUPPORT EPROTOTYPE ERANGE EREMOTE ERESTART EROFS ESHUTDOWN ESOCKTNOSUPPORT ESPIPE ESRCH ESTALE ETIMEDOUT ETOOMANYREFS ETXTBSY EUSERS EWOULDBLOCK EXDEV

FCNTL

Constants: FD_CLOEXEC F_DUPFD F_GETFD F_GETFL F_GETLK F_OK F_RDLCK F_SETFD F_SETFL F_SETLK F_SETLKW F_UNLCK F_WRLCK O_ACCMODE O_APPEND O_CREAT O_EXCL O_NOCTTY O_NONBLOCK O_RDONLY O_RDWR O_TRUNC O_WRONLY

FLOAT

Constants: DBL_DIG DBL_EPSILON DBL_MANT_DIG DBL_MAX DBL_MAX_10_EXP DBL_MAX_EXP DBL_MIN DBL_MIN_10_EXP DBL_MIN_EXP FLT_DIG FLT_EPSILON FLT_MANT_DIG FLT_MAX FLT_MAX_10_EXP FLT_MAX_EXP FLT_MIN FLT_MIN_10_EXP FLT_MIN_EXP FLT_RADIX FLT_ROUNDS LDBL_DIG LDBL_EPSILON LDBL_MANT_DIG LDBL_MAX LDBL_MAX_10_EXP LDBL_MAX_EXP LDBL_MIN LDBL_MIN_10_EXP LDBL_MIN_EXP

LIMITS

Constants: ARG_MAX CHAR_BIT CHAR_MAX CHAR_MIN CHILD_MAX INT_MAX INT_MIN LINK_MAX LONG_MAX LONG_MIN MAX_CANON MAX_INPUT MB_LEN_MAX NAME_MAX NGROUPS_MAX OPEN_MAX PATH_MAX PIPE_BUF SCHAR_MAX SCHAR_MIN SHRT_MAX SHRT_MIN SSIZE_MAX STREAM_MAX TZNAME_MAX UCHAR_MAX UINT_MAX ULONG_MAX USHRT_MAX

LOCALE

Constants: LC_ALL LC_COLLATE LC_CTYPE LC_MONETARY LC_NUMERIC LC_TIME

MATH

Constants: HUGE_VAL

SIGNAL

Constants: SA_NOCLDSTOP SA_NOCLDWAIT SA_NODEFER SA_ONSTACK SA_RESETHAND SA_RESTART SA_SIGINFO SIGABRT SIGALRM SIGCHLD SIGCONT SIGFPE SIGHUP SIGILL SIGINT SIGKILL SIGPIPE SIGQUIT SIGSEGV SIGSTOP SIGTERM SIGTSTP SIGTTIN SIGTTOU SIGUSR1 SIGUSR2 SIG_BLOCK SIG_DFL SIG_ERR SIG_IGN SIG_SETMASK SIG_UNBLOCK

STAT

Constants: S_IRGRP S_IROTH S_IRUSR S_IRWXG S_IRWXO S_IRWXU S_ISGID S_ISUID S_IWGRP S_IWOTH S_IWUSR S_IXGRP S_IXOTH S_IXUSR
Macros: S_ISBLK S_ISCHR S_ISDIR S_ISFIFO S_ISREG

STDLIB

Constants: EXIT_FAILURE EXIT_SUCCESS MB_CUR_MAX RAND_MAX

STDIO

Constants: BUFSIZ EOF FILENAME_MAX L_ctermid L_cuserid L_tmpname TMP_MAX

TIME

Constants: CLK_TCK CLOCKS_PER_SEC

UNISTD

Constants: R_OK SEEK_CUR SEEK_END SEEK_SET STDIN_FILENO STDOUT_FILENO STDERR_FILENO W_OK X_OK

WAIT

Constants: WNOHANG WUNTRACED
WNOHANG: Do not suspend the calling process until a child process changes state but instead return immediately.
WUNTRACED: Catch stopped child processes.
Macros: WIFEXITED WEXITSTATUS WIFSIGNALED WTERMSIG WIFSTOPPED WSTOPSIG
WIFEXITED: WIFEXITED($?) returns true if the child process exited normally (CWexit() or by falling off the end of CWmain())
WEXITSTATUS: WEXITSTATUS($?) returns the normal exit status of the child process (only meaningful if WIFEXITED($?) is true)
WIFSIGNALED: WIFSIGNALED($?) returns true if the child process terminated because of a signal
WTERMSIG: WTERMSIG($?) returns the signal the child process terminated for (only meaningful if WIFSIGNALED($?) is true)
WIFSTOPPED: WIFSTOPPED($?) returns true if the child process is currently stopped (can happen only if you specified the WUNTRACED flag to waitpid())
WSTOPSIG: WSTOPSIG($?) returns the signal the child process was stopped for (only meaningful if WIFSTOPPED($?) is true)

Sections du manuel

Commandes
Appels systèmes
Fonctions bibliothèques
- posix
- o
- ssl
- fun
- cc
- bind
- ncurses
- form
- menu
- curses
- erl
- perl
- tiff
- tcl
- iv
- iwidgets
- nas
- debug
- gdbm
- ggi
- ruby
- abz
- alleg
- ber
- caca
- el
- gle
- snmp
- ncp
- ossp
- diet
- m17n
- f
- plplot
- pub
- PVM
- rtl
- tclrl
- tclx
- tk
- WN
- blt
- readline
- pm
Fichiers spéciaux
Formats
Jeux
Conventions
Administration système
Fonctions noyau
Nouveau

cd ~tigrou/pwet.fr/man/linux/Fonctions bibliothèques/perl/POSIX

man POSIX () - Perl interface to IEEE Std 1003.1

NAME

SYNOPSIS

DESCRIPTION

NOTE

CAVEATS

FUNCTIONS

CLASSES

POSIX::SigAction

POSIX::SigSet

POSIX::Termios

PATHNAME CONSTANTS

POSIX CONSTANTS

SYSTEM CONFIGURATION

ERRNO

FCNTL

FLOAT

LIMITS

LOCALE

MATH

SIGNAL

STAT

STDLIB

STDIO

TIME

UNISTD

WAIT

Sections du manuel

Blog Linux