Copyright (c) 1997 Peter Wemm <peter@FreeBSD.org>
Redistribution and use in source and binary forms, with or without
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THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.Dd August 19, 1997 .Dt GETSID 2 .Os .Sh NAME .Nm getsid .Nd get process session .Sh LIBRARY .Lb libc .Sh SYNOPSIS n unistd.h .Ft pid_t .Fn getsid "pid_t pid" .Sh DESCRIPTION The session ID of the process identified by .Fa pid is returned by .Fn getsid . If .Fa pid is zero, .Fn getsid returns the session ID of the current process. .Sh RETURN VALUES Upon successful completion, the .Fn getsid system call returns the session ID of the specified process; otherwise, it returns a value of -1 and sets errno to indicate an error. .Sh ERRORS The .Fn getsid system call will succeed unless: l -tag -width Er t Bq Er ESRCH if there is no process with a process ID equal to .Fa pid . .El
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions
are met:
1. Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in the
documentation and/or other materials provided with the distribution.
THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
SUCH DAMAGE.
.Dd August 19, 1997 .Dt GETSID 2 .Os .Sh NAME .Nm getsid .Nd get process session .Sh LIBRARY .Lb libc .Sh SYNOPSIS n unistd.h .Ft pid_t .Fn getsid "pid_t pid" .Sh DESCRIPTION The session ID of the process identified by .Fa pid is returned by .Fn getsid . If .Fa pid is zero, .Fn getsid returns the session ID of the current process. .Sh RETURN VALUES Upon successful completion, the .Fn getsid system call returns the session ID of the specified process; otherwise, it returns a value of -1 and sets errno to indicate an error. .Sh ERRORS The .Fn getsid system call will succeed unless: l -tag -width Er t Bq Er ESRCH if there is no process with a process ID equal to .Fa pid . .El
p Note that an implementation may restrict this system call to processes within the same session ID as the calling process. .Sh SEE ALSO .Xr getpgid 2 , .Xr getpgrp 2 , .Xr setpgid 2 , .Xr setsid 2 , .Xr termios 4 .Sh HISTORY The .Fn getsid system call appeared in .Fx 3.0 . The .Fn getsid system call is derived from its usage in .At V .