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.)
RETIRN 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 current process, and the
implementation considers this an error.
- ESRCH
-
No process with process ID p was found.
CONFORMING TO
SVr4, POSIX.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), credentials(7), feature_test_macros(7)
Copyright (C) 1996 Andries Brouwer (aeb@cwi.nl)
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 output of any
document formatting or typesetting system, including
intermediate and printed output.
This manual is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public
License along with this manual; if not, write to the Free
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111,
USA.
Modified Thu Oct 31 14:18:40 1996 by Eric S. Raymond <esr@y\thyrsus.com>
Modified 2001-12-17, aeb
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