656ca7bdd9
Since we're comparing the return value to a smallish integer anyway, we might as well use that bb_strtou() returns UINT_MAX for malformed input. Referencing errno is kinda bloaty on glibc. While NSIG is not in POSIX, we do already rely on it being defined, compile-time const and smallish, since arrays in struct globals_misc are defined in terms of it. function old new delta get_signum 312 286 -26 Signed-off-by: Rasmus Villemoes <rasmus.villemoes@prevas.dk> Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
270 lines
6.1 KiB
C
270 lines
6.1 KiB
C
/* vi: set sw=4 ts=4: */
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/*
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* Signal name/number conversion routines.
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*
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* Copyright 2006 Rob Landley <rob@landley.net>
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*
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* Licensed under GPLv2 or later, see file LICENSE in this source tree.
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*/
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//config:config FEATURE_RTMINMAX
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//config: bool "Support RTMIN[+n] and RTMAX[-n] signal names"
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//config: default y
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//config: help
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//config: Support RTMIN[+n] and RTMAX[-n] signal names
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//config: in kill, killall etc. This costs ~250 bytes.
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//config:
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//config:config FEATURE_RTMINMAX_USE_LIBC_DEFINITIONS
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//config: bool "Use the definitions of SIGRTMIN/SIGRTMAX provided by libc"
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//config: default y
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//config: depends on FEATURE_RTMINMAX
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//config: help
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//config: Some C libraries reserve a few real-time signals for internal
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//config: use, and adjust the values of SIGRTMIN/SIGRTMAX seen by
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//config: applications accordingly. Saying yes here means that a signal
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//config: name RTMIN+n will be interpreted according to the libc definition
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//config: of SIGRTMIN, and not the raw definition provided by the kernel.
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//config: This behavior matches "kill -l RTMIN+n" from bash.
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#include "libbb.h"
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/* Believe it or not, but some arches have more than 32 SIGs!
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* HPPA: SIGSTKFLT == 36. */
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static const char signals[][7] ALIGN1 = {
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// SUSv3 says kill must support these, and specifies the numerical values,
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// http://www.opengroup.org/onlinepubs/009695399/utilities/kill.html
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// {0, "EXIT"}, {1, "HUP"}, {2, "INT"}, {3, "QUIT"},
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// {6, "ABRT"}, {9, "KILL"}, {14, "ALRM"}, {15, "TERM"}
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// And Posix adds the following:
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// {SIGILL, "ILL"}, {SIGTRAP, "TRAP"}, {SIGFPE, "FPE"}, {SIGUSR1, "USR1"},
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// {SIGSEGV, "SEGV"}, {SIGUSR2, "USR2"}, {SIGPIPE, "PIPE"}, {SIGCHLD, "CHLD"},
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// {SIGCONT, "CONT"}, {SIGSTOP, "STOP"}, {SIGTSTP, "TSTP"}, {SIGTTIN, "TTIN"},
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// {SIGTTOU, "TTOU"}
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[0] = "EXIT",
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#ifdef SIGHUP
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[SIGHUP ] = "HUP",
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#endif
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#ifdef SIGINT
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[SIGINT ] = "INT",
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#endif
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#ifdef SIGQUIT
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[SIGQUIT ] = "QUIT",
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#endif
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#ifdef SIGILL
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[SIGILL ] = "ILL",
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#endif
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#ifdef SIGTRAP
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[SIGTRAP ] = "TRAP",
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#endif
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#ifdef SIGABRT
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[SIGABRT ] = "ABRT",
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#endif
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#ifdef SIGBUS
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[SIGBUS ] = "BUS",
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#endif
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#ifdef SIGFPE
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[SIGFPE ] = "FPE",
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#endif
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#ifdef SIGKILL
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[SIGKILL ] = "KILL",
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#endif
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#ifdef SIGUSR1
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[SIGUSR1 ] = "USR1",
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#endif
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#ifdef SIGSEGV
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[SIGSEGV ] = "SEGV",
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#endif
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#ifdef SIGUSR2
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[SIGUSR2 ] = "USR2",
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#endif
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#ifdef SIGPIPE
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[SIGPIPE ] = "PIPE",
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#endif
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#ifdef SIGALRM
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[SIGALRM ] = "ALRM",
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#endif
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#ifdef SIGTERM
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[SIGTERM ] = "TERM",
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#endif
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#ifdef SIGSTKFLT
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[SIGSTKFLT] = "STKFLT",
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#endif
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#ifdef SIGCHLD
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[SIGCHLD ] = "CHLD",
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#endif
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#ifdef SIGCONT
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[SIGCONT ] = "CONT",
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#endif
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#ifdef SIGSTOP
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[SIGSTOP ] = "STOP",
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#endif
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#ifdef SIGTSTP
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[SIGTSTP ] = "TSTP",
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#endif
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#ifdef SIGTTIN
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[SIGTTIN ] = "TTIN",
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#endif
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#ifdef SIGTTOU
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[SIGTTOU ] = "TTOU",
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#endif
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#ifdef SIGURG
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[SIGURG ] = "URG",
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#endif
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#ifdef SIGXCPU
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[SIGXCPU ] = "XCPU",
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#endif
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#ifdef SIGXFSZ
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[SIGXFSZ ] = "XFSZ",
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#endif
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#ifdef SIGVTALRM
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[SIGVTALRM] = "VTALRM",
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#endif
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#ifdef SIGPROF
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[SIGPROF ] = "PROF",
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#endif
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#ifdef SIGWINCH
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[SIGWINCH ] = "WINCH",
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#endif
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#ifdef SIGPOLL
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[SIGPOLL ] = "POLL",
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#endif
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#ifdef SIGPWR
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[SIGPWR ] = "PWR",
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#endif
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#ifdef SIGSYS
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[SIGSYS ] = "SYS",
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#endif
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#if ENABLE_FEATURE_RTMINMAX && !ENABLE_FEATURE_RTMINMAX_USE_LIBC_DEFINITIONS
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# ifdef __SIGRTMIN
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[__SIGRTMIN] = "RTMIN",
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# endif
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// This makes array about x2 bigger.
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// More compact approach is to special-case SIGRTMAX in print_signames()
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//# ifdef __SIGRTMAX
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// [__SIGRTMAX] = "RTMAX",
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//# endif
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#endif
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};
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// Convert signal name to number.
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int FAST_FUNC get_signum(const char *name)
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{
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unsigned i;
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/* bb_strtou returns UINT_MAX on error. NSIG is smaller
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* than UINT_MAX on any sane Unix. Hence no need
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* to check errno after bb_strtou().
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*/
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i = bb_strtou(name, NULL, 10);
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if (i < NSIG) /* for shells, we allow 0 too */
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return i;
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if (strncasecmp(name, "SIG", 3) == 0)
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name += 3;
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for (i = 0; i < ARRAY_SIZE(signals); i++)
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if (strcasecmp(name, signals[i]) == 0)
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return i;
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#if ENABLE_DESKTOP
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# if defined(SIGIOT) || defined(SIGIO)
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/* SIGIO[T] are aliased to other names,
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* thus cannot be stored in the signals[] array.
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* Need special code to recognize them */
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if ((name[0] | 0x20) == 'i' && (name[1] | 0x20) == 'o') {
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# ifdef SIGIO
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if (!name[2])
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return SIGIO;
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# endif
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# ifdef SIGIOT
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if ((name[2] | 0x20) == 't' && !name[3])
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return SIGIOT;
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# endif
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}
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# endif
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#endif
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#if ENABLE_FEATURE_RTMINMAX && defined(SIGRTMIN) && defined(SIGRTMAX)
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{
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# if ENABLE_FEATURE_RTMINMAX_USE_LIBC_DEFINITIONS
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/* Use the libc provided values. */
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unsigned sigrtmin = SIGRTMIN;
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unsigned sigrtmax = SIGRTMAX;
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# else
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/* Use the "raw" SIGRTMIN/MAX. Underscored names, if exist, provide
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* them. If they don't exist, fall back to non-underscored ones: */
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# if !defined(__SIGRTMIN)
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# define __SIGRTMIN SIGRTMIN
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# endif
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# if !defined(__SIGRTMAX)
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# define __SIGRTMAX SIGRTMAX
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# endif
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# define sigrtmin __SIGRTMIN
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# define sigrtmax __SIGRTMAX
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# endif
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if (strncasecmp(name, "RTMIN", 5) == 0) {
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if (!name[5])
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return sigrtmin;
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if (name[5] == '+') {
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i = bb_strtou(name + 6, NULL, 10);
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if (i <= sigrtmax - sigrtmin)
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return sigrtmin + i;
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}
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}
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else if (strncasecmp(name, "RTMAX", 5) == 0) {
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if (!name[5])
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return sigrtmax;
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if (name[5] == '-') {
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i = bb_strtou(name + 6, NULL, 10);
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if (i <= sigrtmax - sigrtmin)
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return sigrtmax - i;
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}
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}
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# undef sigrtmin
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# undef sigrtmax
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}
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#endif
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return -1;
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}
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// Convert signal number to name
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const char* FAST_FUNC get_signame(int number)
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{
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if ((unsigned)number < ARRAY_SIZE(signals)) {
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if (signals[number][0]) /* if it's not an empty str */
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return signals[number];
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}
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return itoa(number);
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}
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// Print the whole signal list
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void FAST_FUNC print_signames(void)
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{
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unsigned signo;
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for (signo = 1; signo < ARRAY_SIZE(signals); signo++) {
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const char *name = signals[signo];
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if (name[0])
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printf("%2u) %s\n", signo, name);
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}
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#if ENABLE_FEATURE_RTMINMAX
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# if ENABLE_FEATURE_RTMINMAX_USE_LIBC_DEFINITIONS
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# if defined(SIGRTMIN) && defined(SIGRTMAX)
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printf("%2u) %s\n", SIGRTMIN, "RTMIN");
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printf("%2u) %s\n", SIGRTMAX, "RTMAX");
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# endif
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# else
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// __SIGRTMIN is included in signals[] array.
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# ifdef __SIGRTMAX
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printf("%2u) %s\n", __SIGRTMAX, "RTMAX");
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# endif
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# endif
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#endif
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}
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