1GETSID(2)                  Linux Programmer's Manual                 GETSID(2)
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NAME

6       getsid - get session ID
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SYNOPSIS

9       #include <sys/types.h>
10       #include <unistd.h>
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12       pid_t getsid(pid_t pid);
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14   Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
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16       getsid():
17           _XOPEN_SOURCE >= 500
18               || /* Since glibc 2.12: */ _POSIX_C_SOURCE >= 200809L
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DESCRIPTION

21       getsid(0)  returns  the  session  ID  of the calling process.  getsid()
22       returns the session ID of the process with process ID pid.  If  pid  is
23       0, getsid() returns the session ID of the calling process.
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RETURN VALUE

26       On  success,  a  session  ID is returned.  On error, (pid_t) -1 will be
27       returned, and errno is set appropriately.
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ERRORS

30       EPERM  A process with process ID pid exists, but it is not in the  same
31              session as the calling process, and the implementation considers
32              this an error.
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34       ESRCH  No process with process ID pid was found.
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VERSIONS

37       This system call is available on Linux since version 2.0.
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CONFORMING TO

40       POSIX.1-2001, POSIX.1-2008, SVr4.
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NOTES

43       Linux does not return EPERM.
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45       See credentials(7) for a description of sessions and session IDs.
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SEE ALSO

48       getpgid(2), setsid(2), credentials(7)
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COLOPHON

51       This page is part of release 4.15 of the Linux  man-pages  project.   A
52       description  of  the project, information about reporting bugs, and the
53       latest    version    of    this    page,    can     be     found     at
54       https://www.kernel.org/doc/man-pages/.
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58Linux                             2017-09-15                         GETSID(2)
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