TIOCSPGRP - process group and session ID

NAME LIBRARY SYNOPSIS DESCRIPTION RETURN VALUE ERRORS SEE ALSO

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

TIOCGPGRP

When successful, equivalent to *argp = tcgetpgrp(fd).

Get the process group ID of the foreground process group on this terminal.

TIOCSPGRP

Equivalent to tcsetpgrp(fd, *argp).

Set the foreground process group ID of this terminal.

TIOCGSID

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

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