diff options
| -rw-r--r-- | libc/sysdeps/linux/mips/bits/signum.h | 17 |
1 files changed, 15 insertions, 2 deletions
diff --git a/libc/sysdeps/linux/mips/bits/signum.h b/libc/sysdeps/linux/mips/bits/signum.h index cf9b834c4..e83250e2d 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. */ |