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
|| /* 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
POSIX.1-2001, POSIX.1-2008, SVr4.NOTES
Linux does not return EPERM.COLOPHON
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