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

NAME
       getsid - get session ID

SYNOPSIS
       #include 

       pidt getsid(pidt pid);

   Feature Test Macro Requirements for glibc (see featuretestmacros(7)):

       getsid():
           XOPENSOURCE >= 500 || XOPENSOURCE && XOPENSOURCEEXTENDED
           || /* Since glibc 2.12: */ POSIXCSOURCE >= 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, (pidt) -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 3.53 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)