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noted F_GETOWN bug after suggestion from aeb.

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Michael Kerrisk 2004-12-10 16:26:28 +00:00
parent 527d993350
commit 7c3b0e957d
1 changed files with 13 additions and 2 deletions
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15
man2/fcntl.2
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@ -44,6 +44,7 @@
.\" Modified, 27 May 2004, Michael Kerrisk <mtk-manpages@gmx.net>
.\" Added notes on capability requirements
.\" Modified 2004-12-08, added O_NOATIME after note from Martin Pool
.\" 2004-12-10, mtk, noted F_GETOWN bug after suggestion from aeb.
.\"
.TH FCNTL 2 2004-12-08 "Linux 2.6.9" "Linux Programmer's Manual"
.SH NAME
@ -333,7 +334,7 @@ are used to manage I/O availability signals:
Get the process ID or process group currently receiving SIGIO
and SIGURG signals for events on file descriptor
.IR fd .
Process groups are returned as negative values.
Process groups are returned as negative values (but see BUGS below).
.TP
.B F_SETOWN
Set the process ID or process group that will receive SIGIO
@ -727,7 +728,17 @@ Clearly,
.I l_pid
alone is not going to be very useful if the process holding the lock
may live on a different machine.
.SH BUGS
A limitation of the Linux system call conventions means that if
a (negative) process group ID to be returned by
.B F_GETOWN
falls in the range -1 to -4095, then the return value is wrongly
interpreted by glibc as an error in the system call;
that is, the return value of
.BR fcntl ()
will be \-1, and
.I errno
will contain the (positive) process group ID.
.SH "CONFORMING TO"
SVr4, SVID, POSIX, X/OPEN, BSD 4.3. Only the operations F_DUPFD,
F_GETFD, F_SETFD, F_GETFL, F_SETFL, F_GETLK, F_SETLK and F_SETLKW are