getsid(2)

1getsid(2)                     System Calls Manual                    getsid(2)
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NAME

6       getsid - get session ID
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LIBRARY

9       Standard C library (libc, -lc)
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SYNOPSIS

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

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

27       On success, a session ID is returned.   On  error,  (pid_t) -1  is  re‐
28       turned, and errno is set to indicate the error.
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ERRORS

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

38       Linux does not return EPERM.
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STANDARDS

41       POSIX.1-2008.
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HISTORY

44       POSIX.1-2001, SVr4.  Linux 2.0.
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NOTES

47       See credentials(7) for a description of sessions and session IDs.
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