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socket: use accept4 when available

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Linux, *BSD, and Solaris support accept4 system call that enables the
caller to assign additional flags and save some extra system calls. It
can come in handy when O_NONBLOCK or/and FD_CLOEXEC is/are required on a
socket after being accepted.

Ref:
https://man7.org/linux/man-pages/man2/accept.2.html
https://man.freebsd.org/cgi/man.cgi?query=accept4
https://man.dragonflybsd.org/?command=accept&section=2
https://man.openbsd.org/accept.2
https://man.netbsd.org/accept.2
https://docs.oracle.com/cd/E88353_01/html/E37843/accept4-3c.html
https://www.gnu.org/software/gnulib/manual/html_node/accept4.html

Closes #16979
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Andy Pan 2025-04-05 23:55:32 +08:00 • committed by Daniel Stenberg
parent 2f5e4e0db4
commit 3d02872be7
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8 changed files with 52 additions and 2 deletions
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18
lib/memdebug.c
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@ -378,6 +378,24 @@ curl_socket_t curl_dbg_accept(curl_socket_t s, void *saddr, void *saddrlen,
return sockfd;
}
#ifdef HAVE_ACCEPT4
curl_socket_t curl_dbg_accept4(curl_socket_t s, void *saddr, void *saddrlen,
int flags,
int line, const char *source)
{
struct sockaddr *addr = (struct sockaddr *)saddr;
curl_socklen_t *addrlen = (curl_socklen_t *)saddrlen;
curl_socket_t sockfd = accept4(s, addr, addrlen, flags);
if(source && (sockfd != CURL_SOCKET_BAD))
curl_dbg_log("FD %s:%d accept() = %" FMT_SOCKET_T "\n",
source, line, sockfd);
return sockfd;
}
#endif
/* separate function to allow libcurl to mark a "faked" close */
void curl_dbg_mark_sclose(curl_socket_t sockfd, int line, const char *source)
{