1GETSID(3P)                 POSIX Programmer's Manual                GETSID(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       getsid — get the process group ID of a session leader
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SYNOPSIS

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

20       The getsid() function shall obtain the process group ID of the  process
21       that  is the session leader of the process specified by pid.  If pid is
22       (pid_t)0, it specifies the calling process.
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RETURN VALUE

25       Upon successful completion, getsid() shall return the process group  ID
26       of  the  session  leader  of the specified process. Otherwise, it shall
27       return -1 and set errno to indicate the error.
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ERRORS

30       The getsid() function shall fail if:
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32       EPERM  The process specified by pid is not in the same session  as  the
33              calling process, and the implementation does not allow access to
34              the process group ID of the session leader of that process  from
35              the 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 following sections are informative.
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EXAMPLES

42       None.
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APPLICATION USAGE

45       None.
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RATIONALE

48       None.
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FUTURE DIRECTIONS

51       None.
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SEE ALSO

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