|GETSID(2)||Linux Programmer's Manual||GETSID(2)|
NAME¶getsid - get session ID
Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
_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.
- 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.
- 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 3.44 of the Linux man-pages project. A description of the project, and information about reporting bugs, can be found at http://www.kernel.org/doc/man-pages/.