From: Baruch Siach Date: Fri, 29 Sep 2017 10:06:52 +0300 Subject: [PATCH] Fix build with musl and older Linux kernel The musl libc carries its own copy of Linux system calls. When building with Linux headers older than v3.17, musl provides SYS_getrandom definition, but not GRND_NONBLOCK. This causes build failure for libressl and openntpd: getentropy_linux.c: In function 'getentropy_getrandom': getentropy_linux.c:205:42: error: 'GRND_NONBLOCK' undeclared (first use in this function) ret = syscall(SYS_getrandom, buf, len, GRND_NONBLOCK); ^~~~~~~~~~~~~ Define GRND_NONBLOCK locally when its definition is missing to fix the build. There should be no run-time effect. Older kernels return ENOSYS for unsupported syscall(). [ from upstream pull request with file location changed ] Signed-off-by: Baruch Siach --- Upstream status: https://github.com/libressl-portable/openbsd/pull/82 diff -Nuar openntpd-6.2p2-orig/compat/getentropy_linux.c openntpd-6.2p2/compat/getentropy_linux.c --- openntpd-6.2p2-orig/compat/getentropy_linux.c 2017-09-07 22:12:02.000000000 +0300 +++ openntpd-6.2p2/compat/getentropy_linux.c 2017-09-29 11:54:54.856245770 +0300 @@ -194,6 +194,11 @@ } #ifdef SYS_getrandom + +#ifndef GRND_NONBLOCK +#define GRND_NONBLOCK 0x0001 +#endif + static int getentropy_getrandom(void *buf, size_t len) {