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| author | kib <kib@FreeBSD.org> | 2011-03-25 14:01:18 +0000 |
|---|---|---|
| committer | kib <kib@FreeBSD.org> | 2011-03-25 14:01:18 +0000 |
| commit | 4dc12088a11c128c9cbe74247ccb5b2a1ddb92c8 (patch) | |
| tree | 203974a6aa91367f543a3066472089db1d53e057 /lib/libc/sys/open.2 | |
| parent | fc2bd01611a5db99f84b5d7f3109b9f9274f548d (diff) | |
| download | FreeBSD-src-4dc12088a11c128c9cbe74247ccb5b2a1ddb92c8.zip FreeBSD-src-4dc12088a11c128c9cbe74247ccb5b2a1ddb92c8.tar.gz | |
Document O_CLOEXEC.
Reviewed by: jhb
MFC after: 1 week
Diffstat (limited to 'lib/libc/sys/open.2')
| -rw-r--r-- | lib/libc/sys/open.2 | 20 |
1 files changed, 16 insertions, 4 deletions
diff --git a/lib/libc/sys/open.2 b/lib/libc/sys/open.2 index deca8bc..e0f5fff 100644 --- a/lib/libc/sys/open.2 +++ b/lib/libc/sys/open.2 @@ -28,7 +28,7 @@ .\" @(#)open.2 8.2 (Berkeley) 11/16/93 .\" $FreeBSD$ .\" -.Dd February 28, 2009 +.Dd March 25, 2011 .Dt OPEN 2 .Os .Sh NAME @@ -118,6 +118,7 @@ O_NOFOLLOW do not follow symlinks O_NOCTTY don't assign controlling terminal O_TTY_INIT restore default terminal attributes O_DIRECTORY error if file is not a directory +O_CLOEXEC set FD_CLOEXEC upon open .Ed .Pp Opening a file with @@ -231,6 +232,11 @@ from opening files which are even unsafe to open with .Dv O_RDONLY , such as device nodes. .Pp +.Dv O_CLOEXEC +may be used to set +.Dv FD_CLOEXEC +flag for the newly returned file descriptor. +.Pp If successful, .Fn open returns a non-negative integer, termed a file descriptor. @@ -241,12 +247,18 @@ file is set to the beginning of the file. When a new file is created it is given the group of the directory which contains it. .Pp -The new descriptor is set to remain open across +Unless +.Dv +O_CLOEXEC +flag was specified, +the new descriptor is set to remain open across .Xr execve 2 system calls; see -.Xr close 2 +.Xr close 2 , +.Xr fcntl 2 and -.Xr fcntl 2 . +.Dv O_CLOEXEC +description. .Pp The system imposes a limit on the number of file descriptors open simultaneously by one process. |
