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RedHat 9 (Linux i386) - man page for getsid (redhat section 2)

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

       getsid - get session ID

       #include <unistd.h>

       pid_t getsid(pid_t pid);

       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 appropri-

       EPERM  A process with process ID p exists, but it is not in the same session as	the  cur-
	      rent process, and the implementation considers this an error.

       ESRCH  No process with process ID p was found.

       SVr4, POSIX 1003.1-2001.

       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.

       getpgid(2), setsid(2)

Linux 2.5.0				    2001-12-17					GETSID(2)
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