procps/proc/sig.c

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/*
* Copyright 1998-2002 by Albert Cahalan; all rights resered.
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* This file may be used subject to the terms and conditions of the
* GNU Library General Public License Version 2, or any later version
* at your option, as published by the Free Software Foundation.
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Library General Public License for more details.
*/
#include <signal.h>
#include <string.h>
#include <stdio.h>
#include <stdlib.h>
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#include "sig.h"
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/* Linux signals:
*
* SIGSYS is required by Unix98.
* SIGEMT is part of SysV, BSD, and ancient UNIX tradition.
*
* They are provided by these Linux ports: alpha, mips, sparc, and sparc64.
* You get SIGSTKFLT and SIGUNUSED instead on i386, m68k, ppc, and arm.
* (this is a Linux & libc bug -- both must be fixed)
*
* Total garbage: SIGIO SIGINFO SIGIOT SIGLOST SIGCLD
* (popular ones are handled as aliases)
* Nearly garbage: SIGSTKFLT SIGUNUSED (nothing else to fill slots)
*/
/* Linux 2.3.29 replaces SIGUNUSED with the standard SIGSYS signal */
#ifndef SIGSYS
# warning Standards require that <signal.h> define SIGSYS
# define SIGSYS SIGUNUSED
#endif
/* If we see both, it is likely SIGSTKFLT (junk) was replaced. */
#ifdef SIGEMT
# undef SIGSTKFLT
#endif
#ifndef SIGRTMIN
# warning Standards require that <signal.h> define SIGRTMIN; assuming 32
# define SIGRTMIN 32
#endif
/* It seems the SPARC libc does not know the kernel supports SIGPWR. */
#ifndef SIGPWR
# warning Your header files lack SIGPWR. (assuming it is number 29)
# define SIGPWR 29
#endif
typedef struct mapstruct {
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const char *name;
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int num;
} mapstruct;
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static const mapstruct sigtable[] = {
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{"ABRT", SIGABRT}, /* IOT */
{"ALRM", SIGALRM},
{"BUS", SIGBUS},
{"CHLD", SIGCHLD}, /* CLD */
{"CONT", SIGCONT},
#ifdef SIGEMT
{"EMT", SIGEMT},
#endif
{"FPE", SIGFPE},
{"HUP", SIGHUP},
{"ILL", SIGILL},
{"INT", SIGINT},
{"KILL", SIGKILL},
{"PIPE", SIGPIPE},
{"POLL", SIGPOLL}, /* IO */
{"PROF", SIGPROF},
{"PWR", SIGPWR},
{"QUIT", SIGQUIT},
{"SEGV", SIGSEGV},
#ifdef SIGSTKFLT
{"STKFLT", SIGSTKFLT},
#endif
{"STOP", SIGSTOP},
{"SYS", SIGSYS}, /* UNUSED */
{"TERM", SIGTERM},
{"TRAP", SIGTRAP},
{"TSTP", SIGTSTP},
{"TTIN", SIGTTIN},
{"TTOU", SIGTTOU},
{"URG", SIGURG},
{"USR1", SIGUSR1},
{"USR2", SIGUSR2},
{"VTALRM", SIGVTALRM},
{"WINCH", SIGWINCH},
{"XCPU", SIGXCPU},
{"XFSZ", SIGXFSZ}
};
static const int number_of_signals = sizeof(sigtable)/sizeof(mapstruct);
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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}
/* return -1 on failure */
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int signal_name_to_number(const char *restrict name){
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long val;
int offset;
/* clean up name */
if(!strncasecmp(name,"SIG",3)) name += 3;
if(!strcasecmp(name,"CLD")) return SIGCHLD;
if(!strcasecmp(name,"IO")) return SIGPOLL;
if(!strcasecmp(name,"IOT")) return SIGABRT;
/* search the table */
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{
const mapstruct ms = {name,0};
const mapstruct *restrict const ptr = bsearch(
&ms,
sigtable,
number_of_signals,
sizeof(mapstruct),
compare_signal_names
);
if(ptr) return ptr->num;
}
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if(!strcasecmp(name,"RTMIN")) return SIGRTMIN;
if(!strcasecmp(name,"EXIT")) return 0;
if(!strcasecmp(name,"NULL")) return 0;
offset = 0;
if(!strncasecmp(name,"RTMIN+",6)){
name += 6;
offset = SIGRTMIN;
}
/* not found, so try as a number */
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{
char *endp;
val = strtol(name,&endp,10);
if(*endp || endp==name) return -1; /* not valid */
}
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if(val+SIGRTMIN>127) return -1; /* not valid */
return val+offset;
}
static const char *signal_number_to_name(int signo){
static char buf[32];
int n = number_of_signals;
signo &= 0x7f; /* need to process exit values too */
while(n--){
if(sigtable[n].num==signo) return sigtable[n].name;
}
if(signo == SIGRTMIN) return "RTMIN";
if(signo) sprintf(buf, "RTMIN+%d", signo-SIGRTMIN);
else strcpy(buf,"0"); /* AIX has NULL; Solaris has EXIT */
return buf;
}
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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 */
int ret = 0; /* to be used as exit code by caller */
int place = 0; /* position on this line */
int amt;
if(argc > 128) return 1;
while(argc--){
char tmpbuf[16];
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const char *restrict const txt = *argv;
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if(*txt >= '0' && *txt <= '9'){
long val;
char *endp;
val = strtol(txt,&endp,10);
if(*endp){
fprintf(stderr, "Signal \"%s\" not known.\n", txt);
ret = 1;
goto end;
}
amt = sprintf(tmpbuf, "%s", signal_number_to_name(val));
}else{
int sno;
sno = signal_name_to_number(txt);
if(sno == -1){
fprintf(stderr, "Signal \"%s\" not known.\n", txt);
ret = 1;
goto end;
}
amt = sprintf(tmpbuf, "%d", sno);
}
if(!place){
strcpy(buf,tmpbuf);
place = amt;
goto end;
}
if(amt+place+1 > max_line){
printf("%s\n", buf);
strcpy(buf,tmpbuf);
place = amt;
goto end;
}
sprintf(buf+place, " %s", tmpbuf);
place += amt+1;
end:
argv++;
}
if(place) printf("%s\n", buf);
return ret;
}
void pretty_print_signals(void){
int i = 0;
while(++i <= number_of_signals){
int n;
n = printf("%2d %s", i, signal_number_to_name(i));
if(i%7) printf(" \0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0" + n);
else printf("\n");
}
if((i-1)%7) printf("\n");
}
void unix_print_signals(void){
int pos = 0;
int i = 0;
while(++i <= number_of_signals){
if(i-1) printf("%c", (pos>73)?(pos=0,'\n'):(pos++,' ') );
pos += printf("%s", signal_number_to_name(i));
}
printf("\n");
}
/* sanity check */
static int init_signal_list(void) __attribute__((constructor));
static int init_signal_list(void){
if(number_of_signals != 31){
fprintf(stderr, "WARNING: %d signals -- adjust and recompile.\n", number_of_signals);
}
return 0;
}