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TIOCSPGRP(2const) TIOCSPGRP(2const)

NAME

TIOCGPGRP, TIOCSPGRP, TIOCGSID - process group and session ID

LIBRARY

Standard C library (libc, -lc)

SYNOPSIS

#include <asm/termbits.h>  /* Definition of TIOC* constants */
#include <sys/ioctl.h>
int ioctl(int fd, TIOCGPGRP, pid_t *argp);
int ioctl(int fd, TIOCSPGRP, const pid_t *argp);
int ioctl(int fd, TIOCGSID, pid_t *argp);

DESCRIPTION

When successful, equivalent to *argp = tcgetpgrp(fd).
Get the process group ID of the foreground process group on this terminal.
Equivalent to tcsetpgrp(fd, *argp).
Set the foreground process group ID of this terminal.
When successful, equivalent to *argp = tcgetsid(fd).
Get the session ID of the given terminal. This fails with the error ENOTTY if the terminal is not a master pseudoterminal and not our controlling terminal. Strange.

RETURN VALUE

On success, 0 is returned. On error, -1 is returned, and errno is set to indicate the error.

ERRORS

The terminal is not a master pseudoterminal and not our controlling terminal.
Insufficient permission.

SEE ALSO

ioctl(2), ioctl_tty(2), tcgetpgrp(3), tcsetpgrp(3), tcgetsid(3)

2024-06-13 Linux man-pages (unreleased)