Copyright (C) 1996 Andries Brouwer (firstname.lastname@example.org) and Copyright (C) 2016 Michael Kerrisk <email@example.com> %%%LICENSE_START(GPLv2+_DOC_FULL) This is free documentation; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. The GNU General Public License's references to "object code" and "executables" are to be interpreted as the outp...
NAMEgetsid - get session ID
pid_t getsid(pid_t pid);
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
DESCRIPTIONgetsid(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 VALUEOn 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.