diff options
| -rw-r--r-- | libbb/u_signal_names.c | 76 |
1 files changed, 53 insertions, 23 deletions
diff --git a/libbb/u_signal_names.c b/libbb/u_signal_names.c index b3038e32d..866ca85fd 100644 --- a/libbb/u_signal_names.c +++ b/libbb/u_signal_names.c @@ -12,6 +12,18 @@ //config: help //config: Support RTMIN[+n] and RTMAX[-n] signal names //config: in kill, killall etc. This costs ~250 bytes. +//config: +//config:config FEATURE_RTMINMAX_USE_LIBC_DEFINITIONS +//config: bool "Use the definitions of SIGRTMIN/SIGRTMAX provided by libc" +//config: default y +//config: depends on FEATURE_RTMINMAX +//config: help +//config: Some C libraries reserve a few real-time signals for internal +//config: use, and adjust the values of SIGRTMIN/SIGRTMAX seen by +//config: applications accordingly. Saying yes here means that a signal +//config: name RTMIN+n will be interpreted according to the libc definition +//config: of SIGRTMIN, and not the raw definition provided by the kernel. +//config: This behavior matches "kill -l RTMIN+n" from bash. #include "libbb.h" @@ -123,7 +135,7 @@ static const char signals[][7] ALIGN1 = { #ifdef SIGSYS [SIGSYS ] = "SYS", #endif -#if ENABLE_FEATURE_RTMINMAX +#if ENABLE_FEATURE_RTMINMAX && !ENABLE_FEATURE_RTMINMAX_USE_LIBC_DEFINITIONS # ifdef __SIGRTMIN [__SIGRTMIN] = "RTMIN", # endif @@ -168,36 +180,46 @@ int FAST_FUNC get_signum(const char *name) # endif #endif -#if ENABLE_FEATURE_RTMINMAX -# if defined(SIGRTMIN) && defined(SIGRTMAX) -/* libc may use some rt sigs for pthreads and therefore "remap" SIGRTMIN/MAX, - * but we want to use "raw" SIGRTMIN/MAX. Underscored names, if exist, provide - * them. If they don't exist, fall back to non-underscored ones: */ +#if ENABLE_FEATURE_RTMINMAX && defined(SIGRTMIN) && defined(SIGRTMAX) + { +# if ENABLE_FEATURE_RTMINMAX_USE_LIBC_DEFINITIONS + /* Use the libc provided values. */ + unsigned sigrtmin = SIGRTMIN; + unsigned sigrtmax = SIGRTMAX; +# else + /* Use the "raw" SIGRTMIN/MAX. Underscored names, if exist, provide + * them. If they don't exist, fall back to non-underscored ones: */ # if !defined(__SIGRTMIN) # define __SIGRTMIN SIGRTMIN # endif # if !defined(__SIGRTMAX) # define __SIGRTMAX SIGRTMAX # endif - if (strncasecmp(name, "RTMIN", 5) == 0) { - if (!name[5]) - return __SIGRTMIN; - if (name[5] == '+') { - i = bb_strtou(name + 6, NULL, 10); - if (!errno && i <= __SIGRTMAX - __SIGRTMIN) - return __SIGRTMIN + i; + +# define sigrtmin __SIGRTMIN +# define sigrtmax __SIGRTMAX +# endif + if (strncasecmp(name, "RTMIN", 5) == 0) { + if (!name[5]) + return sigrtmin; + if (name[5] == '+') { + i = bb_strtou(name + 6, NULL, 10); + if (!errno && i <= sigrtmax - sigrtmin) + return sigrtmin + i; + } } - } - else if (strncasecmp(name, "RTMAX", 5) == 0) { - if (!name[5]) - return __SIGRTMAX; - if (name[5] == '-') { - i = bb_strtou(name + 6, NULL, 10); - if (!errno && i <= __SIGRTMAX - __SIGRTMIN) - return __SIGRTMAX - i; + else if (strncasecmp(name, "RTMAX", 5) == 0) { + if (!name[5]) + return sigrtmax; + if (name[5] == '-') { + i = bb_strtou(name + 6, NULL, 10); + if (!errno && i <= sigrtmax - sigrtmin) + return sigrtmax - i; + } } +# undef sigrtmin +# undef sigrtmax } -# endif #endif return -1; @@ -228,8 +250,16 @@ void FAST_FUNC print_signames(void) printf("%2u) %s\n", signo, name); } #if ENABLE_FEATURE_RTMINMAX -# ifdef __SIGRTMAX +# if ENABLE_FEATURE_RTMINMAX_USE_LIBC_DEFINITIONS +# if defined(SIGRTMIN) && defined(SIGRTMAX) + printf("%2u) %s\n", SIGRTMIN, "RTMIN"); + printf("%2u) %s\n", SIGRTMAX, "RTMAX"); +# endif +# else +// __SIGRTMIN is included in signals[] array. +# ifdef __SIGRTMAX printf("%2u) %s\n", __SIGRTMAX, "RTMAX"); +# endif # endif #endif } |