586bfb7655
kill -l SIGHUP (or any other signal-name prefixed with "SIG") would cause free() to be called with a bad pointer instead of a pointer to what was allocated. Fix this and add test-case.
297 lines
7.7 KiB
C
297 lines
7.7 KiB
C
/*
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* sig.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 "sig.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 SIGLOST SIGCLD
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* (popular ones are handled as aliases)
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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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{"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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static const int number_of_signals = sizeof(sigtable)/sizeof(mapstruct);
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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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/* 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)) name += 3;
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if(!strcasecmp(name,"CLD")) return SIGCHLD;
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if(!strcasecmp(name,"IO")) return SIGPOLL;
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if(!strcasecmp(name,"IOT")) 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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);
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if(ptr) return ptr->num;
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}
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if(!strcasecmp(name,"RTMIN")) return SIGRTMIN;
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if(!strcasecmp(name,"EXIT")) return 0;
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if(!strcasecmp(name,"NULL")) 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) return -1; /* not valid */
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}
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if(val+SIGRTMIN>127) 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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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) return sigtable[n].name;
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}
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if(signo == SIGRTMIN) return "RTMIN";
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if(signo) sprintf(buf, "RTMIN+%d", signo-SIGRTMIN);
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else strcpy(buf,"0"); /* AIX has NULL; Solaris has EXIT */
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return buf;
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}
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int print_given_signals(int argc, const char *restrict const *restrict argv, int max_line){
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char buf[1280]; /* 128 signals, "RTMIN+xx" is largest */
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int ret = 0; /* to be used as exit code by caller */
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int place = 0; /* position on this line */
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int amt;
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if(argc > 128) return 1;
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while(argc--){
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char tmpbuf[16];
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const char *restrict const txt = *argv;
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if(*txt >= '0' && *txt <= '9'){
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long val;
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char *endp;
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val = strtol(txt,&endp,10);
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if(*endp){
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fprintf(stderr, "Signal \"%s\" not known.\n", txt);
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ret = 1;
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goto end;
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}
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amt = sprintf(tmpbuf, "%s", signal_number_to_name(val));
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}else{
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int sno;
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sno = signal_name_to_number(txt);
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if(sno == -1){
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fprintf(stderr, "Signal \"%s\" not known.\n", txt);
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ret = 1;
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goto end;
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}
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amt = sprintf(tmpbuf, "%d", sno);
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}
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if(!place){
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strcpy(buf,tmpbuf);
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place = amt;
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goto end;
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}
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if(amt+place+1 > max_line){
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printf("%s\n", buf);
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strcpy(buf,tmpbuf);
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place = amt;
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goto end;
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}
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sprintf(buf+place, " %s", tmpbuf);
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place += amt+1;
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end:
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argv++;
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}
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if(place) printf("%s\n", buf);
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return ret;
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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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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) return NULL; /* not valid */
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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 == sigtable[i].num){
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converted = strdup(sigtable[i].name);
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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, sigtable[i].name) == 0){
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converted = malloc(sizeof(char) * 8);
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if (converted)
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snprintf(converted, sizeof(converted) - 1, "%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 pretty_print_signals(void){
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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) 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 printf("\n");
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}
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if((i-1)%7) printf("\n");
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}
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void unix_print_signals(void){
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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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/* sanity check */
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static int init_signal_list(void) __attribute__((constructor));
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static int init_signal_list(void){
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if(number_of_signals != 31){
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fprintf(stderr, "WARNING: %d signals -- adjust and recompile.\n", number_of_signals);
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}
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return 0;
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}
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