Hello,
On Sat, Oct 06, 2018 at 12:00:02PM +0200, devel-request@uclibc-ng.org wrote:
Message: 1 Date: Fri, 5 Oct 2018 07:48:40 -0600 From: Lance Fredrickson lancethepants@gmail.com To: devel@uclibc-ng.org Subject: [uclibc-ng-devel] Fwd: recvmmsg/sendmmsg not in kernel < Linux 2.6.33 Message-ID: fc65bbd1-8cfa-f4cb-9a5b-25e21a273494@gmail.com Content-Type: text/plain; charset="utf-8"; Format="flowed"
Hi,
I'm having an issue where it seems recvmmsg/sendmmsg is being included into the c library regardless of kernel version. I work with kernel versions < 2.6.33 before this feature was included. When compiling applications, autoconf is then mistakenly told from the c-library that recvmmsg/sendmmsg is supported by the kernel, resulting in runtime errors. I use buildroot to compile my toolchains.
Looking through uclibc-ng git, it looks like this feature was added with this commit. https://cgit.uclibc-ng.org/cgi/cgit/uclibc-ng.git/commit/?id=6e15fafa2006663...
+# ifdef __NR_recvmmsg ^^^^^^^^^^^^^ + return (ssize_t)INLINE_SYSCALL(recvmmsg, 5, sockfd, msg, vlen, flags, tmo); +# else ...... + return (ssize_t)__socketcall(SYS_RECVMMSG, args); +# endif +}
You kernel define __NR_recvmmsg in unistd.h ?
Best Regards Guo Ren