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GETSID

Section: Linux Programmer's Manual (2)
Updated: 2010-09-26
Index Return to Main Contents

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NAME

getsid - get session ID  

SYNOPSIS

#include <unistd.h>

pid_t getsid(pid_t pid);

Feature Test Macro Requirements for glibc (see feature_test_macros(7)):

getsid():

_XOPEN_SOURCE >= 500 || _XOPEN_SOURCE && _XOPEN_SOURCE_EXTENDED
|| /* Since glibc 2.12: */ _POSIX_C_SOURCE >= 200809L

 

DESCRIPTION

getsid(0) returns the session ID of the calling process. getsid(p) returns the session ID of the process with process ID p. (The session ID of a process is the process group ID of the session leader.)  

RETURN VALUE

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

ERRORS

EPERM

A process with process ID p exists, but it is not in the same session as the calling process, and the implementation considers this an error.

ESRCH

No process with process ID p was found.

 

VERSIONS

This system call is available on Linux since version 2.0.  

CONFORMING TO

SVr4, POSIX.1-2001.  

NOTES

Linux does not return EPERM.  

SEE ALSO

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

COLOPHON

This page is part of release 3.35 of the Linux man-pages project. A description of the project, and information about reporting bugs, can be found at http://man7.org/linux/man-pages/.

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Index

NAME

SYNOPSIS

DESCRIPTION

RETURN VALUE

ERRORS

VERSIONS

CONFORMING TO

NOTES

SEE ALSO

COLOPHON

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