getsid(2) [redhat man page]

GETSID(2)						     Linux Programmer's Manual							 GETSID(2)

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)

Linux 2.5.0							    2001-12-17								 GETSID(2)

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 || _XOPEN_SOURCE && _XOPEN_SOURCE_EXTENDED
	   || /* Since glibc 2.12: */ _POSIX_C_SOURCE >= 200809L

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 3.44 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								    2010-09-26								 GETSID(2)