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select.2: Place the discussion of the self-pipe technique in a headed subsection 

Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
This commit is contained in:
Michael Kerrisk 2020-02-18 12:02:41 +01:00
parent 73e8f3b4c1
commit d221e421a5
1 changed files with 11 additions and 10 deletions
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21
man2/select.2
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@ -497,6 +497,17 @@ Portable programs may wish to check for
and loop, just as with and loop, just as with
.BR EINTR . .BR EINTR .
.PP .PP
Under glibc 2.0,
.I <sys/select.h>
gives the wrong prototype for
.BR pselect ().
Under glibc 2.1 to 2.2.1, it gives
.BR pselect ()
when
.B _GNU_SOURCE
is defined.
.\"
.SS The self-pipe trick
On systems that lack On systems that lack
.BR pselect (), .BR pselect (),
reliable (and more portable) signal trapping can be achieved reliable (and more portable) signal trapping can be achieved
@ -509,16 +520,6 @@ in the main program.
(To avoid possibly blocking when writing to a pipe that may be full (To avoid possibly blocking when writing to a pipe that may be full
or reading from a pipe that may be empty, or reading from a pipe that may be empty,
nonblocking I/O is used when reading from and writing to the pipe.) nonblocking I/O is used when reading from and writing to the pipe.)
.PP
Under glibc 2.0,
.I <sys/select.h>
gives the wrong prototype for
.BR pselect ().
Under glibc 2.1 to 2.2.1, it gives
.BR pselect ()
when
.B _GNU_SOURCE
is defined.
.\" .\"
.SS Emulating usleep(3) .SS Emulating usleep(3)
.PP .PP