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GETSID(3P)		   POSIX Programmer's Manual		    GETSID(3P)

       This  manual  page is part of the POSIX Programmer's Manual.  The Linux
       implementation of this interface may differ (consult the	 corresponding
       Linux  manual page for details of Linux behavior), or the interface may
       not be implemented on Linux.

       getsid — get the process group ID of a session leader

       #include <unistd.h>

       pid_t getsid(pid_t pid);

       The getsid() function shall obtain the process group ID of the  process
       that  is the session leader of the process specified by pid.  If pid is
       (pid_t)0, it specifies the calling process.

       Upon successful completion, getsid() shall return the process group  ID
       of  the	session	 leader	 of the specified process. Otherwise, it shall
       return −1 and set errno to indicate the error.

       The getsid() function shall fail if:

       EPERM  The process specified by pid is not in the same session  as  the
	      calling process, and the implementation does not allow access to
	      the process group ID of the session leader of that process  from
	      the calling process.

       ESRCH  There is no process with a process ID equal to pid.

       The following sections are informative.





       exec, fork(), getpid(), getpgid(), setpgid(), setsid()

       The Base Definitions volume of POSIX.1‐2008, <unistd.h>

       Portions	 of  this text are reprinted and reproduced in electronic form
       from IEEE Std 1003.1, 2013 Edition, Standard for Information Technology
       --  Portable  Operating	System	Interface (POSIX), The Open Group Base
       Specifications Issue 7, Copyright (C) 2013 by the Institute of Electri‐
       cal  and	 Electronics  Engineers,  Inc  and  The	 Open Group.  (This is
       POSIX.1-2008 with the 2013 Technical Corrigendum	 1  applied.)  In  the
       event of any discrepancy between this version and the original IEEE and
       The Open Group Standard, the original IEEE and The Open Group  Standard
       is  the	referee document. The original Standard can be obtained online
       at .

       Any typographical or formatting errors that appear  in  this  page  are
       most likely to have been introduced during the conversion of the source
       files to man page format. To report such errors,	 see  https://www.ker‐ .

IEEE/The Open Group		     2013			    GETSID(3P)

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