GETSID(P) POSIX Programmer's Manual GETSID(P)
getsid - get the process group ID of a session leader
pid_t getsid(pid_t pid);
The getsid() function shall obtain 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
Upon successful completion, getsid() shall return the process group ID of the session
leader of the specified process. Otherwise, it shall return (pid_t)-1 and set errno to
indicate the error.
The getsid() function shall fail if:
EPERM The process specified by pid is not in the same session as the calling process, and
the implementation does not allow access to the process group ID of the session
leader of that process from the calling process.
ESRCH There is no process with a process ID equal to pid.
The following sections are informative.
exec() , fork() , getpid() , getpgid() , setpgid() , setsid() , the Base Definitions vol-
ume of IEEE Std 1003.1-2001, <unistd.h>
Portions of this text are reprinted and reproduced in electronic form from IEEE Std
1003.1, 2003 Edition, Standard for Information Technology -- Portable Operating System
Interface (POSIX), The Open Group Base Specifications Issue 6, Copyright (C) 2001-2003 by
the Institute of Electrical and Electronics Engineers, Inc and The Open Group. In the
event of any discrepancy between this version and the original IEEE and The Open Group
Standard, the original IEEE and The Open Group Standard is the referee document. The orig-
inal Standard can be obtained online at http://www.opengroup.org/unix/online.html .
IEEE/The Open Group 2003 GETSID(P)