man getrusage () - get information about resource utilization
NAME
getrusage - get information about resource utilization
SYNOPSIS
#include <sys/resource.h>
int getrusage(int who, struct rusage *r_usage);
DESCRIPTION
The getrusage() function shall provide measures of the resources used by the current process or its terminated and waited-for child processes. If the value of the who argument is RUSAGE_SELF, information shall be returned about resources used by the current process. If the value of the who argument is RUSAGE_CHILDREN, information shall be returned about resources used by the terminated and waited-for children of the current process. If the child is never waited for (for example, if the parent has SA_NOCLDWAIT set or sets SIGCHLD to SIG_IGN), the resource information for the child process is discarded and not included in the resource information provided by getrusage().
The r_usage argument is a pointer to an object of type struct rusage in which the returned information is stored.
RETURN VALUE
Upon successful completion, getrusage() shall return 0; otherwise, -1 shall be returned and errno set to indicate the error.
ERRORS
The getrusage() function shall fail if:
- EINVAL
- The value of the who argument is not valid.
The following sections are informative.
EXAMPLES
Using getrusage()
The following example returns information about the resources used by the current process.
#include <sys/resource.h> ... int who = RUSAGE_SELF; struct rusage usage; int ret;
ret = getrusage(who, &usage);
APPLICATION USAGE
None.
RATIONALE
None.
FUTURE DIRECTIONS
None.
SEE ALSO
exit() , sigaction() , time() , times() , wait() , the Base Definitions volume of IEEE Std 1003.1-2001, <sys/resource.h>
COPYRIGHT
Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1, 2003 Edition, Standard for Information Technology -- Portable Operating System Interface (POSIX), The Open Group Base Specifications Issue 6, Copyright (C) 2001-2003 by the Institute of Electrical and Electronics Engineers, Inc and The Open Group. In the event of any discrepancy between this version and the original IEEE and The Open Group Standard, the original IEEE and The Open Group Standard is the referee document. The original Standard can be obtained online at http://www.opengroup.org/unix/online.html .