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

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 (pid_t)-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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41       The following sections are informative.
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EXAMPLES

44       None.
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APPLICATION USAGE

47       None.
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RATIONALE

50       None.
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FUTURE DIRECTIONS

53       None.
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SEE ALSO

56       exec(), fork(), getpid(), getpgid(), setpgid(), setsid(), the Base Def‐
57       initions volume of IEEE Std 1003.1-2001, <unistd.h>
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60       Portions of this text are reprinted and reproduced in  electronic  form
61       from IEEE Std 1003.1, 2003 Edition, Standard for Information Technology
62       -- Portable Operating System Interface (POSIX),  The  Open  Group  Base
63       Specifications  Issue  6,  Copyright  (C) 2001-2003 by the Institute of
64       Electrical and Electronics Engineers, Inc and The Open  Group.  In  the
65       event of any discrepancy between this version and the original IEEE and
66       The Open Group Standard, the original IEEE and The Open Group  Standard
67       is  the  referee document. The original Standard can be obtained online
68       at http://www.opengroup.org/unix/online.html .
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72IEEE/The Open Group                  2003                           GETSID(3P)
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