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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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23
configure.ac
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@@ -784,7 +784,7 @@ AC_FUNC_STRNLEN
AC_FUNC_STRTOD
AC_FUNC_UTIME_NULL
AC_FUNC_VPRINTF
AC_CHECK_FUNCS([asprintf atexit closefrom dup2 eaccess endpwent euidaccess ffsll ftruncate getcwd gethostbyname gethostname getloadavg gettimeofday glob ioperm inet_ntoa isascii memchr memmove memset mkdir mkdtemp munmap newlocale ppoll putenv re_comp regcomp select setenv socket strcasecmp strcasestr strchr strcspn strdup strerror strlcat strlcpy strncasecmp strndup strnlen strrchr strsep strspn strstr strtod strtol strtold strtoq unsetenv uselocale utime vasprintf getpeereid sysctl swapctl malloc_trim])
AC_CHECK_FUNCS([asprintf atexit closefrom dup2 eaccess endpwent euidaccess ffsll ftruncate getcwd gethostbyname gethostname getloadavg gettimeofday glob ioperm inet_ntoa isascii memchr memmove memset mkdir mkdtemp munmap newlocale pipe2 ppoll putenv re_comp regcomp select setenv socket strcasecmp strcasestr strchr strcspn strdup strerror strlcat strlcpy strncasecmp strndup strnlen strrchr strsep strspn strstr strtod strtol strtold strtoq unsetenv uselocale utime vasprintf getpeereid sysctl swapctl malloc_trim])
AC_MSG_CHECKING(for htonll)
AC_LINK_IFELSE(
@@ -1124,6 +1124,27 @@ AC_RUN_IFELSE(
AC_MSG_RESULT(unknown)
)
AC_MSG_CHECKING([if socket() accepts SOCK_NONBLOCK])
AC_RUN_IFELSE(
[AC_LANG_PROGRAM([
#ifdef HAVE_SYS_TYPES_H
# include <sys/types.h>
#endif
#ifdef HAVE_SYS_SOCKET_H
# include <sys/socket.h>
#endif
], [
if (socket(AF_INET, SOCK_STREAM | SOCK_NONBLOCK, 0) < 0) {
return 1;
}
return 0;
])],
AC_MSG_RESULT(yes)
AC_DEFINE([HAVE_SOCK_NONBLOCK], 1, [Define to 1 if your socket() implementation can accept SOCK_NONBLOCK.]),
AC_MSG_RESULT(no),
AC_MSG_RESULT(cross-compile)
)
AC_MSG_CHECKING(if we can increase the maximum select-able file descriptor)
AC_RUN_IFELSE(
[AC_LANG_PROGRAM([