TCGETPGRP(3P)TCGETPGRP(3P)NAME
tcgetpgrp, tcsetpgrp - get and set foreground process group ID
SYNOPSIS
#include <sys/types.h>
int tcgetpgrp(int fildes);
int tcsetpgrp(int fildes, pid_t pgrp_id);
DESCRIPTION
Tcgetpgrp returns the value of the process group ID of the foreground
process group associated with the terminal, indicated through fildes.
It may be called from a process that is a member of a background
process group; however, the information may be changed by a process
that is a member of a foreground process group.
Tcsetpgrp sets the foreground process group ID associated with the
controlling terminal, indicated through fildes, to pgrp_id. The
controlling terminal must be currently associated with the session of
the calling process. The value of pgrp_id must match a process group
ID of a process in the same session as the calling process.
RETURN VALUE
Upon successful completion tcgetpgrp and tcsetpgrp return a value of
zero. Otherwise, a value of -1 is returned and errno is set to
indicate the error.
ERRORS
Tcgetpgrp and tcsetpgrp shall return -1 and set errno to the
corresponding value:
[EBADF] The fildes argument is not a valid file descriptor.
[ENOTTY] The calling process does not have a controlling
terminal.
[ENOTTY] The file given through fildes is not the controlling
terminal.
The following errors may be associated with tcsetpgrp:
[EINVAL] The value of the pgrp_id argument is not valid.
[ENOTTY] The controlling terminal is no longer associated with
the session of the calling process.
[EPERM] The value of pgrp_id is a valid value, but does not
match the process group ID of a process in the same
session as the calling process.
SEE ALSOsetsid(2P), setpgid(2P)4th Berkeley Distribution August 1, 1992 TCGETPGRP(3P)
