9e30c5c2b1
Signed-off-by: Vicente Olivert Riera <Vincent.Riera@imgtec.com> Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
44 lines
1.7 KiB
Diff
44 lines
1.7 KiB
Diff
From 2da958760f798224065508431787e3a83b7fe2ae Mon Sep 17 00:00:00 2001
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From: Denys Vlasenko <vda.linux@googlemail.com>
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Date: Fri, 28 Jun 2013 21:59:54 +0200
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Subject: [PATCH-0.9.33] MIPS: set _NSIG to 128, not 129. This matches glibc.
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Prompted by lkml discussion of a MIPS bug where sending
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signal 128 was found to be able to crash the machine :/
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Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
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---
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libc/sysdeps/linux/mips/bits/signum.h | 17 +++++++++++++++--
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1 file changed, 15 insertions(+), 2 deletions(-)
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diff --git a/libc/sysdeps/linux/mips/bits/signum.h b/libc/sysdeps/linux/mips/bits/signum.h
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index cf9b834..e83250e 100644
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--- a/libc/sysdeps/linux/mips/bits/signum.h
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+++ b/libc/sysdeps/linux/mips/bits/signum.h
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@@ -53,7 +53,20 @@
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#define SIGXCPU 30 /* CPU limit exceeded (4.2 BSD). */
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#define SIGXFSZ 31 /* File size limit exceeded (4.2 BSD). */
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-/* Biggest signal number + 1 (including real-time signals). */
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-#define _NSIG 129
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+/* MIPS is special by having 128 signals.
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+ * All (?) other architectures have at most 64 signals.
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+ * Having 128 signals is problematic because signal nos are 1-based
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+ * and last signal number is then 128.
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+ * This plays havoc with WIFSIGNALED and WCOREDUMP in waitpid status word,
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+ * when process dies from signal 128.
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+ * Linux kernel 3.9 accepts signal 128, with awful results :/
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+ * It is being fixed.
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+ *
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+ * glibc (accidentally?) papers over this issue by declaring _NSIG to be 128,
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+ * not 129 (despite claiming that _NSIG is "biggest signal number + 1"
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+ * in the comment above that definition). We follow suit.
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+ * Note that this results in __SIGRTMAX == 127. It is intended.
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+ */
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+#define _NSIG 128
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#endif /* <signal.h> included. */
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--
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1.8.1.2
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