GETSID(2) Linux Programmer s Manual GETSID(2)
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
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 This page is part of release 3.22 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/.
Linux 2008-12-05 GETSID(2)