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