317 lines
8.4 KiB
C
317 lines
8.4 KiB
C
/*
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* signals.c - signal name, and number, conversions
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* Copyright 1998-2003 by Albert Cahalan
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include <ctype.h>
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#include <signal.h>
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#include <string.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include "signals.h"
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#include "c.h"
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/* Linux signals:
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*
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* SIGSYS is required by Unix98.
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* SIGEMT is part of SysV, BSD, and ancient UNIX tradition.
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*
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* They are provided by these Linux ports: alpha, mips, sparc, and sparc64.
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* You get SIGSTKFLT and SIGUNUSED instead on i386, m68k, ppc, and arm.
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* (this is a Linux & libc bug -- both must be fixed)
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*
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* Total garbage: SIGIO SIGINFO SIGIOT SIGCLD
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* (popular ones are handled as aliases)
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* SIGLOST
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* (except on the Hurd; reused to mean a server died)
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* Nearly garbage: SIGSTKFLT SIGUNUSED (nothing else to fill slots)
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*/
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/* Linux 2.3.29 replaces SIGUNUSED with the standard SIGSYS signal */
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#ifndef SIGSYS
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# warning Standards require that <signal.h> define SIGSYS
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# define SIGSYS SIGUNUSED
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#endif
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/* If we see both, it is likely SIGSTKFLT (junk) was replaced. */
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#ifdef SIGEMT
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# undef SIGSTKFLT
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#endif
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#ifndef SIGRTMIN
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# warning Standards require that <signal.h> define SIGRTMIN; assuming 32
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# define SIGRTMIN 32
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#endif
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/* It seems the SPARC libc does not know the kernel supports SIGPWR. */
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#if defined(__linux__) && !defined(SIGPWR)
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# warning Your header files lack SIGPWR. (assuming it is number 29)
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# define SIGPWR 29
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#endif
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typedef struct mapstruct {
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const char *name;
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int num;
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} mapstruct;
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static const mapstruct sigtable[] = {
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{"ABRT", SIGABRT}, /* IOT */
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{"ALRM", SIGALRM},
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{"BUS", SIGBUS},
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{"CHLD", SIGCHLD}, /* CLD */
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{"CONT", SIGCONT},
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#ifdef SIGEMT
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{"EMT", SIGEMT},
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#endif
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{"FPE", SIGFPE},
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{"HUP", SIGHUP},
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{"ILL", SIGILL},
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{"INT", SIGINT},
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{"KILL", SIGKILL},
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#if defined(__GNU__)
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{"LOST", SIGLOST}, /* Hurd-specific */
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#endif
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{"PIPE", SIGPIPE},
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{"POLL", SIGPOLL}, /* IO */
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{"PROF", SIGPROF},
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#ifdef SIGPWR
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{"PWR", SIGPWR},
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#endif
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{"QUIT", SIGQUIT},
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{"SEGV", SIGSEGV},
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#ifdef SIGSTKFLT
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{"STKFLT", SIGSTKFLT},
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#endif
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{"STOP", SIGSTOP},
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{"SYS", SIGSYS}, /* UNUSED */
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{"TERM", SIGTERM},
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{"TRAP", SIGTRAP},
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{"TSTP", SIGTSTP},
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{"TTIN", SIGTTIN},
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{"TTOU", SIGTTOU},
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{"URG", SIGURG},
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{"USR1", SIGUSR1},
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{"USR2", SIGUSR2},
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{"VTALRM", SIGVTALRM},
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{"WINCH", SIGWINCH},
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{"XCPU", SIGXCPU},
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{"XFSZ", SIGXFSZ}
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};
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#define number_of_signals (sizeof(sigtable)/sizeof(mapstruct))
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#define XJOIN(a, b) JOIN(a, b)
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#define JOIN(a, b) a##b
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#define STATIC_ASSERT(x) typedef int XJOIN(static_assert_on_line_,__LINE__)[(x) ? 1 : -1]
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/* sanity check */
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#if defined(__linux__)
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STATIC_ASSERT(number_of_signals == 31);
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#elif defined(__FreeBSD_kernel__) || defined(__FreeBSD__)
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STATIC_ASSERT(number_of_signals == 30);
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#elif defined(__GNU__)
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STATIC_ASSERT(number_of_signals == 31);
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#elif defined(__CYGWIN__)
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STATIC_ASSERT(number_of_signals == 31);
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#else
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# warning Unknown operating system; assuming number_of_signals is correct
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#endif
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static int compare_signal_names(const void *a, const void *b){
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return strcasecmp( ((const mapstruct*)a)->name, ((const mapstruct*)b)->name );
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}
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const char *get_sigtable_name(int row)
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{
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if (row < 0 || row >= number_of_signals)
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return NULL;
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return sigtable[row].name;
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}
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const int get_sigtable_num(int row)
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{
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if (row < 0 || row >= number_of_signals)
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return -1;
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return sigtable[row].num;
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}
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/* return -1 on failure */
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int signal_name_to_number(const char *restrict name){
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long val;
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int offset;
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/* clean up name */
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if(!strncasecmp(name,"SIG",3))
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name += 3;
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if(!strcasecmp(name,"CLD"))
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return SIGCHLD;
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if(!strcasecmp(name,"IO"))
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return SIGPOLL;
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if(!strcasecmp(name,"IOT"))
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return SIGABRT;
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/* search the table */
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{
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const mapstruct ms = {name,0};
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const mapstruct *restrict const ptr = bsearch(
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&ms,
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sigtable,
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number_of_signals,
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sizeof(mapstruct),
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compare_signal_names);
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if(ptr)
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return ptr->num;
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}
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if(!strcasecmp(name,"RTMIN"))
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return SIGRTMIN;
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if(!strcasecmp(name,"EXIT"))
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return 0;
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if(!strcasecmp(name,"NULL"))
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return 0;
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offset = 0;
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if(!strncasecmp(name,"RTMIN+",6)) {
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name += 6;
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offset = SIGRTMIN;
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}
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/* not found, so try as a number */
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{
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char *endp;
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val = strtol(name,&endp,10);
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if(*endp || endp==name)
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return -1; /* not valid */
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}
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if(val<0 || val+SIGRTMIN>127)
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return -1; /* not valid */
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return val+offset;
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}
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const char *signal_number_to_name(int signo)
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{
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static char buf[32];
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int n = number_of_signals;
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signo &= 0x7f; /* need to process exit values too */
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while (n--) {
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if(sigtable[n].num==signo)
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return sigtable[n].name;
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}
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if (signo == SIGRTMIN)
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return "RTMIN";
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if (signo)
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sprintf(buf, "RTMIN+%d", signo-SIGRTMIN);
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else
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strcpy(buf,"0"); /* AIX has NULL; Solaris has EXIT */
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return buf;
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}
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int skill_sig_option(int *argc, char **argv)
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{
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int i;
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int signo = -1;
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for (i = 1; i < *argc; i++) {
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if (argv[i][0] == '-') {
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signo = signal_name_to_number(argv[i] + 1);
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if (-1 < signo) {
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memmove(argv + i, argv + i + 1,
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sizeof(char *) * (*argc - i));
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(*argc)--;
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return signo;
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}
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}
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}
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return signo;
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}
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/* strtosig is similar to print_given_signals() with exception, that
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* this function takes a string, and converts it to a signal name or
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* a number string depending on which way a round conversion is
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* queried. Non-existing signals return NULL. Notice that the
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* returned string should be freed after use.
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*/
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char *strtosig(const char *restrict s)
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{
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char *converted = NULL, *copy, *p, *endp;
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int i, numsignal = 0;
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copy = strdup(s);
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if (!copy)
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xerrx(EXIT_FAILURE, "cannot duplicate string");
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for (p = copy; *p != '\0'; p++)
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*p = toupper(*p);
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p = copy;
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if (p[0] == 'S' && p[1] == 'I' && p[2] == 'G')
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p += 3;
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if (isdigit(*p)){
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numsignal = strtol(s,&endp,10);
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if(*endp || endp==s){
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free(p);
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return NULL; /* not valid */
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}
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}
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if (numsignal){
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for (i = 0; i < number_of_signals; i++){
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if (numsignal == get_sigtable_num(i)){
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converted = strdup(get_sigtable_name(i));
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break;
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}
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}
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} else {
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for (i = 0; i < number_of_signals; i++){
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if (strcmp(p, get_sigtable_name(i)) == 0){
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converted = malloc(12);
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if (converted)
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snprintf(converted, 12, "%d", sigtable[i].num);
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break;
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}
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}
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}
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free(copy);
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return converted;
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}
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void unix_print_signals(void)
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{
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int pos = 0;
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int i = 0;
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while(++i <= number_of_signals){
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if(i-1) printf("%c", (pos>73)?(pos=0,'\n'):(pos++,' ') );
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pos += printf("%s", signal_number_to_name(i));
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}
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printf("\n");
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}
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void pretty_print_signals(void)
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{
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int i = 0;
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while(++i <= number_of_signals){
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int n;
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n = printf("%2d %s", i, signal_number_to_name(i));
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if(n>0 && i%7)
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printf("%s", " \0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0" + n);
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else
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printf("\n");
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}
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if((i-1)%7) printf("\n");
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}
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