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fcntl.2: Add notes on fcntl64() 

Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
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Michael Kerrisk 2010-11-21 06:13:41 +01:00
parent b0226745db
commit 0e8704ae99
1 changed files with 23 additions and 1 deletions
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24
man2/fcntl.2
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@ -58,7 +58,7 @@
.\" 2010-06-17, Michael Kerrisk
.\" Document F_SETPIPE_SZ and F_GETPIPE_SZ.
.\"
.TH FCNTL 2 2010-11-01 "Linux" "Linux Programmer's Manual"
.TH FCNTL 2 2010-11-20 "Linux" "Linux Programmer's Manual"
.SH NAME
fcntl \- manipulate file descriptor
.SH SYNOPSIS
@ -1184,6 +1184,28 @@ macro to obtain these definitions.)
.\" .PP
.\" SVr4 documents additional EIO, ENOLINK and EOVERFLOW error conditions.
.SH NOTES
The original Linux
.BR fcntl ()
system call was not designed to handle large file offsets
(in the
.I flock
structure).
Consequently,
an
.BR fcntl64 ()
system call was added in Linux 2.4.
The newer system call employs a different structure for file locking,
.IR flock64 ,
and corresponding commands,
.BR F_GETLK64 ,
.BR F_SETLK64 ,
and
.BR F_SETLKW64 .
However, these details can be ignored by applications using glibc, whose
.BR fcntl ()
wrapper function transparently employs the more recent system call
where it is available.
The errors returned by
.BR dup2 (2)
are different from those returned by