.\" Copyright (C) 1996 Andries Brouwer (aeb@cwi.nl) .\" .\" This is free documentation; you can redistribute it and/or .\" modify it under the terms of the GNU General Public License as .\" published by the Free Software Foundation; either version 2 of .\" the License, or (at your option) any later version. .\" .\" The GNU General Public License's references to "object code" .\" and "executables" are to be interpreted as the output of any .\" document formatting or typesetting system, including .\" intermediate and printed output. .\" .\" This manual is distributed in the hope that it will be useful, .\" but WITHOUT ANY WARRANTY; without even the implied warranty of .\" MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the .\" GNU General Public License for more details. .\" .\" You should have received a copy of the GNU General Public .\" License along with this manual; if not, write to the Free .\" Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, .\" USA. .\" .TH GETSID 2 "11 April 1996" "Linux 1.3.85" "System calls" .SH NAME getsid \- get session ID .SH SYNOPSIS .B #include .sp .B pid_t getsid(void); .SH DESCRIPTION .B getsid(0) returns the session ID of the calling process. .BI getsid( p ) returns the session ID of the process with process ID .IR p . .SH ERRORS On error, \-1 will be returned. The only error which can happen is ESRCH, when no process with process ID .I p was found. .SH "CONFORMING TO" This call is Linux-specific. .SH "SEE ALSO" .BR setsid (2).