getsid - get session ID
Standard C Library (libc, -lc)
The getsid function returns the session ID of the process specified by
pid. If pid is 0, the session ID of the calling process is returned.
The session ID is defined as the process group ID of the process that is
the session leader.
If an error occurs, getsid returns -1 and the global variable errno is
set to indicate the error, as follows:
[ESRCH] No process can be found corresponding to that specified
The getsid() function conforms to X/Open Portability Guide Issue 4.2
BSD February 13, 1998 BSD
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