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document O_NOFOLLOW and O_FSYNC flags to open

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Alfred Perlstein 2000-11-29 04:08:49 +00:00
parent 2bcc63c545
commit 070f57f520
1 changed files with 21 additions and 0 deletions
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21
lib/libc/sys/open.2
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@ -83,6 +83,8 @@ O_TRUNC truncate size to 0
O_EXCL error if create and file exists
O_SHLOCK atomically obtain a shared lock
O_EXLOCK atomically obtain an exclusive lock
O_FSYNC synchronous writes
O_NOFOLLOW do not follow symlinks
.Ed
.Pp
Opening a file with
@ -120,6 +122,22 @@ returns immediately.
The first time the process attempts to perform I/O on the open
file it will block (not currently implemented).
.Pp
If
.Dv O_FSYNC
is used in the mask, all writes will
immediately be written to disk,
the kernel will not cache written data
and all writes on the descriptor will not return until
the data to be written completes.
.Pp
If
.Dv O_NOFOLLOW
is used in the mask and the target file passed to
.Fn open
is a symbolic link then the
.Fn open
will fail.
.Pp
When opening a file, a lock with
.Xr flock 2
semantics can be obtained by setting
@ -216,6 +234,9 @@ and the file is to be modified.
The process has already reached its limit for open file descriptors.
.It Bq Er ENFILE
The system file table is full.
.It Bq Er EMLINK
.Dv O_NOFOLLOW
was specified and the target is a symbolic link.
.It Bq Er ENXIO
The named file is a character special or block
special file, and the device associated with this special file