Undeclared function 'eventfd error in socketpair

From: Abhinav Singhal via curl-library <curl-library_at_lists.haxx.se>
Date: Sun, 30 Mar 2025 15:31:56 -0400

Hi,

I currently have curl 8.7 installed (built with openssl) and I’m trying to
upgrade to 8.12.1. However, I’m running into the following error:



../../../../../distro/lib/socketpair.c:37:13: error: call to undeclared
function 'eventfd'; ISO C99 and later do not support implicit function
declarations [-Wimplicit-function-declaration]

   37 | int efd = eventfd(0, nonblocking ? EFD_CLOEXEC | EFD_NONBLOCK :
EFD_CLOEXEC);

      | ^

../../../../../distro/lib/socketpair.c:37:38: error: use of undeclared
identifier 'EFD_CLOEXEC'

   37 | int efd = eventfd(0, nonblocking ? EFD_CLOEXEC | EFD_NONBLOCK :
EFD_CLOEXEC);

      | ^

../../../../../distro/lib/socketpair.c:37:52: error: use of undeclared
identifier 'EFD_NONBLOCK'

   37 | int efd = eventfd(0, nonblocking ? EFD_CLOEXEC | EFD_NONBLOCK :
EFD_CLOEXEC);

      | ^

../../../../../distro/lib/socketpair.c:37:67: error: use of undeclared
identifier 'EFD_CLOEXEC'

   37 | int efd = eventfd(0, nonblocking ? EFD_CLOEXEC | EFD_NONBLOCK :
EFD_CLOEXEC);

      | ^

4 errors generated.

Makefile:3061: recipe for target 'libcurl_la-socketpair.lo' failed

--
On further investigation, I found that the following change was introduced
with curl release 8.11.1, which is most likely the cause of the above
failure:
socketpair: fix enabling `USE_EVENTFD` [30]
The following are the libcurl flags in my configuration:
--disable-bearer-auth
--disable-dateparse
--disable-dict
--disable-ech
--disable-gopher
--disable-headers-api
--disable-hsts
--disable-imap
--disable-mime
--disable-mqtt
--disable-negotiate-auth
--disable-ntlm-wb
--disable-pop3
--disable-rtsp
--disable-sspi
--disable-telnet
--disable-tls-srp
--disable-unix-sockets
--disable-websockets
--disable-socketpair
--enable-ipv6
--prefix=/usr
--with-openssl
--with-random=/dev/urandom
--without-brotli
--without-f77
--without-fish-functions-dir
--without-g77
--without-hyper
--without-libidn2
--without-libpsl
--without-librtmp
--without-libssh2
--without-msh3
--without-nghttp2
--without-nghttp3
--without-ngtcp2
--without-openssl-quic
--without-quiche
--without-winidn
--without-zlib
--without-zsh-functions-dir
--without-zstd
How may I get past this issue? Should I enable some of the above components
in order to get past the compilation errors?
Thanks.

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Received on 2025-03-30