procps/lib/signals.c

201 lines
5.3 KiB
C
Raw Normal View History

/*
* signals.c - signal name, and number, conversions
* Copyright 1998-2003 by Albert Cahalan
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <ctype.h>
#include <signal.h>
#include <string.h>
#include <stdio.h>
#include <stdlib.h>
#include "signals.h"
#include "c.h"
/* 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 {
const char *name;
int num;
} mapstruct;
static const mapstruct sigtable[] = {
{"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}
};
const int number_of_signals = sizeof(sigtable)/sizeof(mapstruct);
static int compare_signal_names(const void *a, const void *b){
return strcasecmp( ((const mapstruct*)a)->name, ((const mapstruct*)b)->name );
}
const char *get_sigtable_name(int row)
{
if (row < 0 || row >= number_of_signals)
return NULL;
return sigtable[row].name;
}
const int get_sigtable_num(int row)
{
if (row < 0 || row >= number_of_signals)
return -1;
return sigtable[row].num;
}
/* return -1 on failure */
int signal_name_to_number(const char *restrict name){
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 */
{
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;
}
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 */
{
char *endp;
val = strtol(name,&endp,10);
if(*endp || endp==name)
return -1; /* not valid */
}
if(val+SIGRTMIN>127)
return -1; /* not valid */
return val+offset;
}
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;
}