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Annotated edit history of getpgid(2) version 3, including all changes. View license author blame.
Rev Author # Line
1 perry 1 !!NAME
2 PerryLorier 2 getpgid - get process group
1 perry 3 !!SYNOPSIS
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2 PerryLorier 6 __#include <unistd.h>__
1 perry 7
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2 PerryLorier 9 pid_t getpgid(pid_t__ ''pid''__);
1 perry 10 !!DESCRIPTION
2 PerryLorier 11 getpgid(2) returns the process group ID of the process specified by ''pid''. If ''pid'' is zero, the process ID of the current process is used.
1 perry 12
3 PerryLorier 13 Process groups are used for distribution of signals, and by terminals to arbitrate requests for their input: Processes that have the same process group as the terminal are foreground and may read, while others will block with a signal if they attempt to read. These calls are thus used by programs such as csh(1) to create process groups in implementing job control. The [TIOCGPGRP] and [TIOCSPGRP] calls described in termios(3) are used to get/set the process group of the control terminal.
1 perry 14
2 PerryLorier 15 If a session has a controlling terminal, [CLOCAL] is not set and a hangup occurs, then the session leader is sent a [SIGHUP]. If the session leader exits, the [SIGHUP] signal will be sent to each process in the foreground process group of the controlling terminal.
1 perry 16
2 PerryLorier 17 If the exit of the process causes a process group to become orphaned, and if any member of the newly-orphaned process group is stopped, then a [SIGHUP] signal followed by a [SIGCONT] signal will be sent to each process in the newly-orphaned process group.
1 perry 18
19 !!RETURN VALUE
2 PerryLorier 20 __getpgid__ returns a process group on success. On error, -1 is returned, and ''errno'' is set appropriately.
1 perry 21
22 !!ERRORS
2 PerryLorier 23 ;[EINVAL]: ''pgid'' is less than 0.
24 ;[EPERM]: Various permission violations.
25 ;[ESRCH]: ''pid'' does not match any process.
1 perry 26
27 !!CONFORMING TO
2 PerryLorier 28 The function getpgid(2) conforms to SVr4.
1 perry 29 !!SEE ALSO
2 PerryLorier 30 getuid(2), setsid(2), tcsetpgrp(3), termios(4), [SIGHUP]
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