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GETSID(2) BSD System Calls Manual GETSID(2)
NAME
getsid -- get process session
LIBRARY
Standard C Library (libc, -lc)
SYNOPSIS
#include <unistd.h>
pid_t
getsid(pid_t pid);
DESCRIPTION
The session ID of the process identified by pid is returned by getsid(). If pid is zero, getsid()
returns the session ID of the current process.
RETURN VALUES
Upon successful completion, the function getsid() returns the session ID of the specified process; oth-erwise, otherwise,
erwise, it returns a value of -1 and sets errno to indicate an error.
ERRORS
The getsid() system call will fail if:
[ESRCH] There is no process with a process ID equal to pid.
Note that an implementation may restrict this function call to processes within the same session ID as
the calling process.
SEE ALSO
getpgid(2), getpgrp(2), setpgid(2), setsid(2), termios(4)
HISTORY
The getsid() function call appeared in FreeBSD 3.0. The getsid() function call is derived from its
usage in AT&T System V UNIX.
BSD August 19, 1997 BSD
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