man posix_openpt (Fonctions bibliothèques) - open a pseudo-terminal device
NAME
posix_openpt - open a pseudo-terminal device
SYNOPSIS
#define _XOPEN_SOURCE
#include <stdlib.h> #include <fcntl.h> char *posix_openpt(int flags);
DESCRIPTION
The posix_openpt() function opens an unused pseudo-terminal master device, returning a file descriptor that can be used to refer to that device.
The flags argument is a bit mask that ORs together zero or more of the following flags:
- O_RDWR
- Open the device for both reading and writing. It is usual to specify this flag.
- O_NOCTTY
- Do not make this device the controlling terminal for the process.
RETURN VALUE
On success, ptsname() returns a non-negative file descriptor which is the lowest numbered unused descriptor. On failure, -1 is returned, and errno is set to indicate the error.
ERRORS
CONFORMING TO
posix_openpt() is part of the Unix98 pseudo-terminal support (see pts(4)). This function is specified in POSIX 1003.1-2001.
NOTES
This function is a recent invention in POSIX. Some Unix implementations that support System V (aka Unix 98) pseudo-terminals don't have this function, but it is easy to implement:
int posix_openpt(int flags) { return open("/dev/ptmx", flags); }