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authorA. Wilcox <AWilcox@Wilcox-Tech.com>2018-04-18 03:54:24 -0500
committerA. Wilcox <AWilcox@Wilcox-Tech.com>2018-04-18 03:54:24 -0500
commit752c72a485371af594aa449521439c70e60ecf75 (patch)
treed898b674b1d434cde2dbbc8a8141b4dc8ab87d22 /system/musl/0007-abort-raise-SIGABRT-again-if-signal-is-ignored.patch
parent1b9fbd9e522f06d229a6016e4d045ac0de946266 (diff)
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system/musl: more POSIX
Diffstat (limited to 'system/musl/0007-abort-raise-SIGABRT-again-if-signal-is-ignored.patch')
-rw-r--r--system/musl/0007-abort-raise-SIGABRT-again-if-signal-is-ignored.patch55
1 files changed, 55 insertions, 0 deletions
diff --git a/system/musl/0007-abort-raise-SIGABRT-again-if-signal-is-ignored.patch b/system/musl/0007-abort-raise-SIGABRT-again-if-signal-is-ignored.patch
new file mode 100644
index 000000000..4ab303c7d
--- /dev/null
+++ b/system/musl/0007-abort-raise-SIGABRT-again-if-signal-is-ignored.patch
@@ -0,0 +1,55 @@
+From 1316aae0c862240ff58b1cf38c92cd8cefd02a91 Mon Sep 17 00:00:00 2001
+From: "A. Wilcox" <AWilcox@Wilcox-Tech.com>
+Date: Tue, 17 Apr 2018 22:08:48 -0500
+Subject: [PATCH 7/7] abort: raise SIGABRT again if signal is ignored
+
+POSIX requires that abort() gives the SIGABRT status to waitpid(3) and
+friends. If a signal handler is installed, and erroneously returns,
+then the status given to waitpid(3) is SIGSEGV instead of SIGABRT.
+
+This change gives another opportunity for the proper SIGABRT status to
+be given to any process monitoring this one's process, before we fall
+back to a_crash(), which should be sufficient.
+---
+ src/exit/abort.c | 18 ++++++++++++++++++
+ 1 file changed, 18 insertions(+)
+
+diff --git a/src/exit/abort.c b/src/exit/abort.c
+index ecc0f735..5e5a87c3 100644
+--- a/src/exit/abort.c
++++ b/src/exit/abort.c
+@@ -1,13 +1,31 @@
+ #include <stdlib.h>
+ #include <signal.h>
++#include <string.h>
+ #include "syscall.h"
+ #include "pthread_impl.h"
+ #include "atomic.h"
+
+ _Noreturn void abort(void)
+ {
++ struct sigaction abrtaction;
++ sigset_t abrtset;
++
+ raise(SIGABRT);
+ __block_all_sigs(0);
++
++ /* Unblock just SIGABRT, and set default handler */
++ sigemptyset(&abrtset);
++ sigaddset(&abrtset, SIGABRT);
++ sigprocmask(SIG_UNBLOCK, &abrtset, 0);
++
++ memset(&abrtaction, 0, sizeof(struct sigaction));
++ abrtaction.sa_handler = SIG_DFL;
++
++ sigaction(SIGABRT, &abrtaction, NULL);
++
++ raise(SIGABRT);
++
++ /* Ok, give up. */
+ a_crash();
+ raise(SIGKILL);
+ _Exit(127);
+--
+2.15.0
+