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

13       getsid — get the process group ID of a session leader
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SYNOPSIS

16       #include <unistd.h>
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18       pid_t getsid(pid_t pid);
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DESCRIPTION

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

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

31       The getsid() function shall fail if:
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33       EPERM  The process specified by pid is not in the same session  as  the
34              calling process, and the implementation does not allow access to
35              the process group ID of the session leader of that process  from
36              the calling process.
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38       ESRCH  There is no process with a process ID equal to pid.
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40       The following sections are informative.
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EXAMPLES

43       None.
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APPLICATION USAGE

46       None.
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RATIONALE

49       None.
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FUTURE DIRECTIONS

52       None.
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SEE ALSO

55       exec, fork(), getpid(), getpgid(), setpgid(), setsid()
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57       The Base Definitions volume of POSIX.1‐2008, <unistd.h>
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60       Portions  of  this text are reprinted and reproduced in electronic form
61       from IEEE Std 1003.1, 2013 Edition, Standard for Information Technology
62       --  Portable  Operating  System  Interface (POSIX), The Open Group Base
63       Specifications Issue 7, Copyright (C) 2013 by the Institute of Electri‐
64       cal  and  Electronics  Engineers,  Inc  and  The  Open Group.  (This is
65       POSIX.1-2008 with the 2013 Technical Corrigendum  1  applied.)  In  the
66       event of any discrepancy between this version and the original IEEE and
67       The Open Group Standard, the original IEEE and The Open Group  Standard
68       is  the  referee document. The original Standard can be obtained online
69       at http://www.unix.org/online.html .
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71       Any typographical or formatting errors that appear  in  this  page  are
72       most likely to have been introduced during the conversion of the source
73       files to man page format. To report such errors,  see  https://www.ker‐
74       nel.org/doc/man-pages/reporting_bugs.html .
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78IEEE/The Open Group                  2013                           GETSID(3P)
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