diff options
Diffstat (limited to 'lib/libc')
| -rw-r--r-- | lib/libc/sys/fork.2 | 36 |
1 files changed, 27 insertions, 9 deletions
diff --git a/lib/libc/sys/fork.2 b/lib/libc/sys/fork.2 index 13d9638f82c..fab4fb8a539 100644 --- a/lib/libc/sys/fork.2 +++ b/lib/libc/sys/fork.2 @@ -1,4 +1,4 @@ -.\" $OpenBSD: fork.2,v 1.15 2011/11/06 17:22:20 schwarze Exp $ +.\" $OpenBSD: fork.2,v 1.16 2013/03/31 08:37:00 guenther Exp $ .\" $NetBSD: fork.2,v 1.6 1995/02/27 12:32:36 cgd Exp $ .\" .\" Copyright (c) 1980, 1991, 1993 @@ -30,7 +30,7 @@ .\" .\" @(#)fork.2 8.1 (Berkeley) 6/4/93 .\" -.Dd $Mdocdate: November 6 2011 $ +.Dd $Mdocdate: March 31 2013 $ .Dt FORK 2 .Os .Sh NAME @@ -48,11 +48,14 @@ The new process (child process) is an exact copy of the calling process (parent process) except for the following: .Bl -bullet -offset indent .It -The child process has a unique process ID. +The child process has a unique process ID, +which also does not match any existing process group ID. .It The child process has a different parent process ID (i.e., the process ID of the parent process). .It +The child process has a single thread. +.It The child process has its own copy of the parent's descriptors. These descriptors reference the same underlying objects, so that, for instance, file pointers in file objects are shared between @@ -67,12 +70,26 @@ This descriptor copying is also used by the shell to establish standard input and output for newly created processes as well as to set up pipes. .It +The child process has no +.Xr fcntl 2 Ns -style +file locks. +.It The child process' resource utilizations are set to 0; see -.Xr setrlimit 2 . +.Xr getrusage 2 . .It All interval timers are cleared; see .Xr setitimer 2 . +.It +The child process' semaphore undo values are set to 0; see +.Xr semop 2 . +.It +The child process' pending signals set is empty. +.It +The child process has no memory locks; see +.Xr mlock 2 +and +.Xr mlockall 2 . .El .Pp In general, the child process should call @@ -101,9 +118,10 @@ is set to indicate the error. will fail and no child process will be created if: .Bl -tag -width [EAGAIN] .It Bq Er EAGAIN -The system-imposed limit on the total -number of processes under execution would be exceeded. -This limit is configuration-dependent. +The system-imposed limits on the total +number of processes or total number of threads +under execution would be exceeded. +These limits are configuration dependent. .It Bq Er EAGAIN The limit .Dv RLIMIT_NPROC @@ -114,13 +132,13 @@ There is insufficient swap space for the new process. .El .Sh SEE ALSO .Xr execve 2 , -.Xr setrlimit 2 , +.Xr getrusage 2 , .Xr wait 2 .Sh STANDARDS The .Fn fork function conforms to -.St -p1003.1-90 . +.St -p1003.1-2008 . .Sh HISTORY The .Fn fork |