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/* vi: set sw=4 ts=4: */
/*
* Signal name/number conversion routines.
*
* Copyright 2006 Rob Landley <rob@landley.net>
*
* Licensed under GPLv2 or later, see file LICENSE in this source tree.
*/
//config:config FEATURE_RTMINMAX
//config: bool "Support RTMIN[+n] and RTMAX[-n] signal names"
//config: default y
//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"
/* Believe it or not, but some arches have more than 32 SIGs!
* HPPA: SIGSTKFLT == 36. */
static const char signals[][7] ALIGN1 = {
// SUSv3 says kill must support these, and specifies the numerical values,
// http://www.opengroup.org/onlinepubs/009695399/utilities/kill.html
// {0, "EXIT"}, {1, "HUP"}, {2, "INT"}, {3, "QUIT"},
// {6, "ABRT"}, {9, "KILL"}, {14, "ALRM"}, {15, "TERM"}
// And Posix adds the following:
// {SIGILL, "ILL"}, {SIGTRAP, "TRAP"}, {SIGFPE, "FPE"}, {SIGUSR1, "USR1"},
// {SIGSEGV, "SEGV"}, {SIGUSR2, "USR2"}, {SIGPIPE, "PIPE"}, {SIGCHLD, "CHLD"},
// {SIGCONT, "CONT"}, {SIGSTOP, "STOP"}, {SIGTSTP, "TSTP"}, {SIGTTIN, "TTIN"},
// {SIGTTOU, "TTOU"}
[0] = "EXIT",
#ifdef SIGHUP
[SIGHUP ] = "HUP",
#endif
#ifdef SIGINT
[SIGINT ] = "INT",
#endif
#ifdef SIGQUIT
[SIGQUIT ] = "QUIT",
#endif
#ifdef SIGILL
[SIGILL ] = "ILL",
#endif
#ifdef SIGTRAP
[SIGTRAP ] = "TRAP",
#endif
#ifdef SIGABRT
[SIGABRT ] = "ABRT",
#endif
#ifdef SIGBUS
[SIGBUS ] = "BUS",
#endif
#ifdef SIGFPE
[SIGFPE ] = "FPE",
#endif
#ifdef SIGKILL
[SIGKILL ] = "KILL",
#endif
#ifdef SIGUSR1
[SIGUSR1 ] = "USR1",
#endif
#ifdef SIGSEGV
[SIGSEGV ] = "SEGV",
#endif
#ifdef SIGUSR2
[SIGUSR2 ] = "USR2",
#endif
#ifdef SIGPIPE
[SIGPIPE ] = "PIPE",
#endif
#ifdef SIGALRM
[SIGALRM ] = "ALRM",
#endif
#ifdef SIGTERM
[SIGTERM ] = "TERM",
#endif
#ifdef SIGSTKFLT
[SIGSTKFLT] = "STKFLT",
#endif
#ifdef SIGCHLD
[SIGCHLD ] = "CHLD",
#endif
#ifdef SIGCONT
[SIGCONT ] = "CONT",
#endif
#ifdef SIGSTOP
[SIGSTOP ] = "STOP",
#endif
#ifdef SIGTSTP
[SIGTSTP ] = "TSTP",
#endif
#ifdef SIGTTIN
[SIGTTIN ] = "TTIN",
#endif
#ifdef SIGTTOU
[SIGTTOU ] = "TTOU",
#endif
#ifdef SIGURG
[SIGURG ] = "URG",
#endif
#ifdef SIGXCPU
[SIGXCPU ] = "XCPU",
#endif
#ifdef SIGXFSZ
[SIGXFSZ ] = "XFSZ",
#endif
#ifdef SIGVTALRM
[SIGVTALRM] = "VTALRM",
#endif
#ifdef SIGPROF
[SIGPROF ] = "PROF",
#endif
#ifdef SIGWINCH
[SIGWINCH ] = "WINCH",
#endif
#ifdef SIGPOLL
[SIGPOLL ] = "POLL",
#endif
#ifdef SIGPWR
[SIGPWR ] = "PWR",
#endif
#ifdef SIGSYS
[SIGSYS ] = "SYS",
#endif
#if ENABLE_FEATURE_RTMINMAX && !ENABLE_FEATURE_RTMINMAX_USE_LIBC_DEFINITIONS
# ifdef __SIGRTMIN
[__SIGRTMIN] = "RTMIN",
# endif
// This makes array about x2 bigger.
// More compact approach is to special-case SIGRTMAX in print_signames()
//# ifdef __SIGRTMAX
// [__SIGRTMAX] = "RTMAX",
//# endif
#endif
};
// Convert signal name to number.
int FAST_FUNC get_signum(const char *name)
{
unsigned i;
/* bb_strtou returns UINT_MAX on error. NSIG is smaller
* than UINT_MAX on any sane Unix. Hence no need
* to check errno after bb_strtou().
*/
i = bb_strtou(name, NULL, 10);
if (i < NSIG) /* for shells, we allow 0 too */
return i;
if (strncasecmp(name, "SIG", 3) == 0)
name += 3;
for (i = 0; i < ARRAY_SIZE(signals); i++)
if (strcasecmp(name, signals[i]) == 0)
return i;
#if ENABLE_DESKTOP
# if defined(SIGIOT) || defined(SIGIO)
/* SIGIO[T] are aliased to other names,
* thus cannot be stored in the signals[] array.
* Need special code to recognize them */
if ((name[0] | 0x20) == 'i' && (name[1] | 0x20) == 'o') {
# ifdef SIGIO
if (!name[2])
return SIGIO;
# endif
# ifdef SIGIOT
if ((name[2] | 0x20) == 't' && !name[3])
return SIGIOT;
# endif
}
# endif
#endif
#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
# 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 (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 (i <= sigrtmax - sigrtmin)
return sigrtmax - i;
}
}
# undef sigrtmin
# undef sigrtmax
}
#endif
return -1;
}
// Convert signal number to name
const char* FAST_FUNC get_signame(int number)
{
if ((unsigned)number < ARRAY_SIZE(signals)) {
if (signals[number][0]) /* if it's not an empty str */
return signals[number];
}
return itoa(number);
}
// Print the whole signal list
void FAST_FUNC print_signames(void)
{
unsigned signo;
for (signo = 1; signo < ARRAY_SIZE(signals); signo++) {
const char *name = signals[signo];
if (name[0])
printf("%2u) %s\n", signo, name);
}
#if ENABLE_FEATURE_RTMINMAX
# 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
}
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