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utils: Wrap socket() and pipe() to reduce syscalls

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Some platforms provide an implementation of socket() and pipe2() that allow the
caller to specify that the resulting file descriptors should be non-blocking.

Using these allows us to potentially elide 3 calls into 1 by avoiding extraneous
calls to fcntl() to set the O_NONBLOCK flag afterwards.

In passing, change ast_alertpipe_init() to use pipe2() directly instead of the
wrapper if it is available.

Change-Id: I3ebe654fb549587537161506c6c950f4ab298bb0
This commit is contained in:
Sean Bright
2018-12-07 07:57:48 -05:00
parent 1657508ddd
commit 8a18fb81c1
6 changed files with 175 additions and 8 deletions
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6
include/asterisk/autoconfig.h.in
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@@ -609,6 +609,9 @@
/* Define to indicate presence of the pg_encoding_to_char API. */
#undef HAVE_PGSQL_pg_encoding_to_char
/* Define to 1 if you have the `pipe2' function. */
#undef HAVE_PIPE2
/* Define if your system has the PJPROJECT libraries. */
#undef HAVE_PJPROJECT
@@ -877,6 +880,9 @@
/* Define to 1 if you have the `socket' function. */
#undef HAVE_SOCKET
/* Define to 1 if your socket() implementation can accept SOCK_NONBLOCK. */
#undef HAVE_SOCK_NONBLOCK
/* Define to 1 if your system has soxmix application. */
#undef HAVE_SOXMIX