diff options
| author | Michael Kerrisk <mtk.manpages@gmail.com> | 2008-04-22 04:18:32 +0000 |
|---|---|---|
| committer | Michael Kerrisk <mtk.manpages@gmail.com> | 2008-04-22 04:18:32 +0000 |
| commit | 429e98671d47c377ff337cc10596708175d76d47 (patch) | |
| tree | f911668fdf7e0beae07f97d22a70525309b559bf /man2/fork.2 | |
| parent | 14f5ae6dc873e6d47fa01997e37b35a87f9d1452 (diff) | |
NOTES: since glibc 2.3.3, the glibc NPTL fork() wrapper bypasses the
fork() system call to invoke clone() with appropriate flags.
Diffstat (limited to 'man2/fork.2')
| -rw-r--r-- | man2/fork.2 | 18 |
1 files changed, 17 insertions, 1 deletions
diff --git a/man2/fork.2 b/man2/fork.2 index 2d768558..308e60e6 100644 --- a/man2/fork.2 +++ b/man2/fork.2 @@ -36,7 +36,7 @@ .\" Greatly expanded, to describe all attributes that differ .\" parent and child. .\" -.TH FORK 2 2008-01-13 "Linux" "Linux Programmer's Manual" +.TH FORK 2 2008-04-22 "Linux" "Linux Programmer's Manual" .SH NAME fork \- create a child process .SH SYNOPSIS @@ -191,6 +191,22 @@ Under Linux, is implemented using copy-on-write pages, so the only penalty that it incurs is the time and memory required to duplicate the parent's page tables, and to create a unique task structure for the child. + +Since version 2.3.3, +.\" nptl/sysdeps/unix/sysv/linux/fork.c +rather than invoking the kernel's +.BR fork () +system call, +the glibc +.BR fork () +wrapper that is provided as part of the +NPTL threading implementation invokes +.BR clone (2) +with flags that provide the same effect as the traditional system call. +The glibc wrapper invokes any fork handlers that have been +have been established using +.BR pthread_atfork (3). +.\" and does some magic to ensure that getpid(2) returns the right value. .SH EXAMPLE See .BR pipe (2) |