1GETPGID(3P)                POSIX Programmer's Manual               GETPGID(3P)
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PROLOG

6       This  manual  page is part of the POSIX Programmer's Manual.  The Linux
7       implementation of this interface may differ (consult the  corresponding
8       Linux  manual page for details of Linux behavior), or the interface may
9       not be implemented on Linux.
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NAME

12       getpgid — get the process group ID for a process
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SYNOPSIS

15       #include <unistd.h>
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17       pid_t getpgid(pid_t pid);
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DESCRIPTION

20       The getpgid() function shall return the process group ID of the process
21       whose  process  ID  is  equal  to pid.  If pid is equal to 0, getpgid()
22       shall return the process group ID of the calling process.
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RETURN VALUE

25       Upon successful completion, getpgid() shall return a process group  ID.
26       Otherwise,  it  shall  return  (pid_t)-1  and set errno to indicate the
27       error.
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ERRORS

30       The getpgid() function shall fail if:
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32       EPERM  The process whose process ID is equal to pid is not in the  same
33              session  as the calling process, and the implementation does not
34              allow access to the process group ID of that  process  from  the
35              calling process.
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37       ESRCH  There is no process with a process ID equal to pid.
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39       The getpgid() function may fail if:
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41       EINVAL The value of the pid argument is invalid.
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43       The following sections are informative.
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EXAMPLES

46       None.
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APPLICATION USAGE

49       None.
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RATIONALE

52       None.
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FUTURE DIRECTIONS

55       None.
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SEE ALSO

58       exec, fork(), getpgrp(), getpid(), getsid(), setpgid(), setsid()
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60       The Base Definitions volume of POSIX.1‐2017, <unistd.h>
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63       Portions  of  this text are reprinted and reproduced in electronic form
64       from IEEE Std 1003.1-2017, Standard for Information Technology --  Por‐
65       table  Operating System Interface (POSIX), The Open Group Base Specifi‐
66       cations Issue 7, 2018 Edition, Copyright (C) 2018 by the  Institute  of
67       Electrical  and  Electronics Engineers, Inc and The Open Group.  In the
68       event of any discrepancy between this version and the original IEEE and
69       The  Open Group Standard, the original IEEE and The Open Group Standard
70       is the referee document. The original Standard can be  obtained  online
71       at http://www.opengroup.org/unix/online.html .
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73       Any  typographical  or  formatting  errors that appear in this page are
74       most likely to have been introduced during the conversion of the source
75       files  to  man page format. To report such errors, see https://www.ker‐
76       nel.org/doc/man-pages/reporting_bugs.html .
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80IEEE/The Open Group                  2017                          GETPGID(3P)
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