GETSIDSection: Linux Programmer's Manual (2)
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NAMEgetsid - get session ID
DESCRIPTIONgetsid(0) returns the session ID of the calling process. getsid(p) returns the session ID of the process with process ID p.
ERRORSOn error, -1 will be returned. The only error which can happen is ESRCH, when no process with process ID p was found.
CONFORMING TOSVr4, which documents an additional EPERM error condition.
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Time: 16:02:27 GMT, February 24, 2018