trusty (3) getsid.3posix.gz

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NAME
       getsid - get the process group ID of a session leader


SYNOPSIS
       #include <unistd.h>

       pid_t getsid(pid_t pid);


DESCRIPTION
       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.


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


ERRORS
       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.


EXAMPLES
       None.


APPLICATION USAGE
       None.


RATIONALE
       None.


FUTURE DIRECTIONS
       None.


SEE ALSO
       exec()  ,  fork()  ,  getpid()  ,  getpgid()  ,  setpgid()  ,  setsid()  , the Base Definitions volume of
       IEEE Std 1003.1-2001, <unistd.h>


       Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1, 2003 Edition,
       Standard  for  Information Technology -- Portable Operating System Interface (POSIX), The Open Group Base
       Specifications Issue 6, Copyright (C) 2001-2003 by the Institute of Electrical and Electronics Engineers,
       Inc  and  The  Open Group. 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 http://www.opengroup.org/unix/online.html .