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signal.7: Timeouts make socket interfaces non-restartable 

If setsockopt() is used to set a timeout on a socket(),
then the various socket interfaces are not automatically
restarted, even if SA_RESTART is specified when
establishing the signal handler.  Analogous behavior occurs
for the "stop signals" case.

Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
Reported-by: Didier <did447@gmail.com>
This commit is contained in:
Michael Kerrisk 2008-10-16 20:36:27 +02:00
parent 132249c496
commit 4f6d71a1fc
1 changed files with 41 additions and 2 deletions
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43
man7/signal.7
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@ -41,7 +41,7 @@
.\" Added section on stop/cont signals interrupting syscalls.
.\" 2008-10-05, mtk: various additions
.\"
.TH SIGNAL 7 2008-10-05 "Linux" "Linux Programmer's Manual"
.TH SIGNAL 7 2008-10-15 "Linux" "Linux Programmer's Manual"
.SH NAME
signal \- overview of signals
.SH DESCRIPTION
@ -665,7 +665,8 @@ Socket interfaces:
.BR send (2),
.BR sendto (2),
and
.BR sendmsg (2).
.BR sendmsg (2),
unless a timeout has been set on the socket (see below).
.IP *
File locking interfaces:
.BR flock (2)
@ -704,6 +705,25 @@ when interrupted by a signal handler:
.\" on interruption by a signal handler.
.RS 4
.IP * 2
Socket interfaces, when a timeout has been set on the socket using
.BR setsockopt (2):
.BR accept (2),
.BR recv (2),
.BR recvfrom (2),
and
.BR recvmsg (2),
if a receive timeout
.RB ( SO_RCVTIMEO )
has been set;
.BR connect (2),
.BR send (2),
.BR sendto (2),
and
.BR sendmsg (2),
if a send timeout
.RB ( SO_SNDTIMEO )
has been set.
.IP *
Interfaces used to wait for signals:
.BR pause (2),
.BR sigsuspend (2),
@ -759,6 +779,25 @@ on other systems.
The Linux interfaces that display this behavior are:
.RS 4
.IP * 2
Socket interfaces, when a timeout has been set on the socket using
.BR setsockopt (2):
.BR accept (2),
.BR recv (2),
.BR recvfrom (2),
and
.BR recvmsg (2),
if a receive timeout
.RB ( SO_RCVTIMEO )
has been set;
.BR connect (2),
.BR send (2),
.BR sendto (2),
and
.BR sendmsg (2),
if a send timeout
.RB ( SO_SNDTIMEO )
has been set.
.IP * 2
.BR epoll_wait (2),
.BR epoll_pwait (2).
.IP *