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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

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