getsid(2) -- Linux man page
NAME
getsid - get session ID
SYNOPSIS
#include <unistd.h>
pid_t getsid(pid_t pid);
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.)
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 current process,
and the implementation considers this an error.
- ESRCH
-
No process with process ID
p
was found.
CONFORMING TO
SVr4, POSIX 1003.1-2001.
NOTES
Linux does not return EPERM.
Linux has this system call since Linux 1.3.44.
There is libc support since libc 5.2.19.
To get the prototype under glibc, define both _XOPEN_SOURCE and
_XOPEN_SOURCE_EXTENDED, or use "#define _XOPEN_SOURCE n"
for some integer n larger than or equal to 500.
SEE ALSO
getpgid(2),
setsid(2)
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