NAMEgetsid - 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(): Since glibc 2.12: _POSIX_C_SOURCE >= 200809L || _XOPEN_SOURCE >= 500 || _XOPEN_SOURCE && _XOPEN_SOURCE_EXTENDED Before glibc 2.12: _XOPEN_SOURCE >= 500 || _XOPEN_SOURCE && _XOPEN_SOURCE_EXTENDED
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.
ERRORSEPERM 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.
VERSIONSThis system call is available on Linux since version 2.0.
CONFORMING TOSVr4, POSIX.1-2001.
NOTESLinux does not return EPERM.
SEE ALSOgetpgid(2), setsid(2), credentials(7)
COLOPHONThis page is part of release 3.27 of the Linux man-pages project. A description of the project, and information about reporting bugs, can be found at //www.kernel.org/doc/man-pages/. GETSID(2)