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socketpair: support pipe2 where available

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By replacing pipe with pipe2, it would save us 4 extra system calls of
setting O_NONBLOCK and O_CLOEXEC. This system call is widely supported
across UNIX-like OS's: Linux, *BSD, and SunOS derivatives - Solaris,
illumos, etc.

Ref:
https://man7.org/linux/man-pages/man2/pipe.2.html
https://man.freebsd.org/cgi/man.cgi?query=pipe
https://man.dragonflybsd.org/?command=pipe2
https://man.netbsd.org/pipe.2
https://man.openbsd.org/pipe.2
https://docs.oracle.com/cd/E88353_01/html/E37841/pipe2-2.html
https://illumos.org/man/2/pipe2
https://www.gnu.org/software/gnulib/manual/html_node/pipe2.html

Closes #16987
This commit is contained in:
Andy Pan 2025-04-06 20:37:10 +08:00 • committed by Daniel Stenberg
parent 8988f33f62
commit 131a2fd5aa
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6 changed files with 23 additions and 2 deletions
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3
CMakeLists.txt
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@ -281,7 +281,7 @@ endif()
include(PickyWarnings)
if(CMAKE_SYSTEM_NAME STREQUAL "Linux")
if(CYGWIN OR CMAKE_SYSTEM_NAME STREQUAL "Linux")
string(APPEND CMAKE_C_FLAGS " -D_GNU_SOURCE") # Required for sendmmsg() and accept4()
endif()
@ -1772,6 +1772,7 @@ check_symbol_exists("getaddrinfo" "${CURL_INCLUDES};stdlib.h;string.h" HAVE_
check_symbol_exists("getifaddrs" "${CURL_INCLUDES};stdlib.h" HAVE_GETIFADDRS) # ifaddrs.h
check_symbol_exists("freeaddrinfo" "${CURL_INCLUDES}" HAVE_FREEADDRINFO) # ws2tcpip.h sys/socket.h netdb.h
check_function_exists("pipe" HAVE_PIPE)
check_function_exists("pipe2" HAVE_PIPE2)
check_function_exists("eventfd" HAVE_EVENTFD)
check_symbol_exists("ftruncate" "unistd.h" HAVE_FTRUNCATE)
check_symbol_exists("getpeername" "${CURL_INCLUDES}" HAVE_GETPEERNAME) # winsock2.h unistd.h proto/bsdsocket.h