Date: Sun, 29 Jun 2025 00:30:02 GMT From: Konstantin Belousov <kib@FreeBSD.org> To: src-committers@FreeBSD.org, dev-commits-src-all@FreeBSD.org, dev-commits-src-branches@FreeBSD.org Subject: git: 3131e7a41725 - stable/14 - csu: C standard requires errno on main() entry Message-ID: <202506290030.55T0U2XK086649@gitrepo.freebsd.org>
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The branch stable/14 has been updated by kib: URL: https://cgit.FreeBSD.org/src/commit/?id=3131e7a41725acd53d7612da8cb9de278f81e244 commit 3131e7a41725acd53d7612da8cb9de278f81e244 Author: Konstantin Belousov <kib@FreeBSD.org> AuthorDate: 2025-06-23 23:46:43 +0000 Commit: Konstantin Belousov <kib@FreeBSD.org> CommitDate: 2025-06-29 00:29:12 +0000 csu: C standard requires errno on main() entry (cherry picked from commit 64584008139f73b07fa7c7979c41780be458b8cc) --- lib/libc/csu/libc_start1.c | 9 +++++++++ 1 file changed, 9 insertions(+) diff --git a/lib/libc/csu/libc_start1.c b/lib/libc/csu/libc_start1.c index f0e708e405ce..a1887a2c28c0 100644 --- a/lib/libc/csu/libc_start1.c +++ b/lib/libc/csu/libc_start1.c @@ -28,6 +28,7 @@ #include <sys/param.h> #include <sys/elf.h> #include <sys/elf_common.h> +#include <errno.h> #include <stdlib.h> #include "libc_private.h" @@ -154,6 +155,13 @@ __libc_start1(int argc, char *argv[], char *env[], void (*cleanup)(void), } handle_static_init(argc, argv, env); + + /* + * C17 4.3 paragraph 3: + * The value of errno in the initial thread is zero at program + * startup. + */ + errno = 0; exit(mainX(argc, argv, env)); } @@ -182,5 +190,6 @@ __libc_start1_gcrt(int argc, char *argv[], char *env[], monstartup(eprolp, etextp); handle_static_init(argc, argv, env); + errno = 0; exit(mainX(argc, argv, env)); }
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