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CRTL, getsid, Description
 *Conan The Librarian 

    The getsid function obtains 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.

    This function requires that long (32-bit) UID/GID support be
    enabled. See 32-Bit UID and GID Macro (Integrity servers, Alpha)
    for more information.
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