lib/libc/string/strsignal.c

   1 /*
   2  * Copyright (c) 1988, 1993
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. Neither the name of the University nor the names of its contributors
  14  *    may be used to endorse or promote products derived from this software
  15  *    without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE.
  28  *
  29  * @(#)strerror.c       8.1 (Berkeley) 6/4/93
  30  * $FreeBSD: head/lib/libc/string/strsignal.c 251069 2013-05-28 20:57:40Z emaste $
  31  */
  32
  33 #include "namespace.h"
  34 #if defined(NLS)
  35 #include <nl_types.h>
  36 #endif
  37 #include <limits.h>
  38 #include <errno.h>
  39 #include <stdlib.h>
  40 #include <string.h>
  41 #include <signal.h>
  42 #include "reentrant.h"
  43 #include "un-namespace.h"
  44
  45 #define UPREFIX         "Unknown signal"
  46
  47 static char             sig_ebuf[NL_TEXTMAX];
  48 static char             sig_ebuf_err[NL_TEXTMAX];
  49 static once_t           sig_init_once = ONCE_INITIALIZER;
  50 static thread_key_t     sig_key;
  51 static int              sig_keycreated = 0;
  52
  53 static void
  54 sig_keycreate(void)
  55 {
  56         sig_keycreated = (thr_keycreate(&sig_key, free) == 0);
  57 }
  58
  59 static char *
  60 sig_tlsalloc(void)
  61 {
  62         char *ebuf = NULL;
  63
  64         if (thr_main() != 0)
  65                 ebuf = sig_ebuf;
  66         else {
  67                 if (thr_once(&sig_init_once, sig_keycreate) != 0 ||
  68                     !sig_keycreated)
  69                         goto thr_err;
  70                 if ((ebuf = thr_getspecific(sig_key)) == NULL) {
  71                         if ((ebuf = malloc(sizeof(sig_ebuf))) == NULL)
  72                                 goto thr_err;
  73                         if (thr_setspecific(sig_key, ebuf) != 0) {
  74                                 free(ebuf);
  75                                 ebuf = NULL;
  76                                 goto thr_err;
  77                         }
  78                 }
  79         }
  80 thr_err:
  81         if (ebuf == NULL)
  82                 ebuf = sig_ebuf_err;
  83         return (ebuf);
  84 }
  85
  86 /* XXX: negative 'num' ? (REGR) */
  87 char *
  88 strsignal(int num)
  89 {
  90         char *ebuf;
  91         char tmp[20];
  92         size_t n;
  93         int signum;
  94         char *t, *p;
  95
  96 #if defined(NLS)
  97         int saved_errno = errno;
  98         nl_catd catd;
  99         catd = catopen("libc", NL_CAT_LOCALE);
 100 #endif
 101
 102         ebuf = sig_tlsalloc();
 103
 104         if (num > 0 && num < sys_nsig) {
 105                 n = strlcpy(ebuf,
 106 #if defined(NLS)
 107                         catgets(catd, 2, num, sys_siglist[num]),
 108 #else
 109                         sys_siglist[num],
 110 #endif
 111                         sizeof(sig_ebuf));
 112         } else {
 113                 n = strlcpy(ebuf,
 114 #if defined(NLS)
 115                         catgets(catd, 2, 0xffff, UPREFIX),
 116 #else
 117                         UPREFIX,
 118 #endif
 119                         sizeof(sig_ebuf));
 120
 121                 signum = num;
 122                 if (num < 0)
 123                         signum = -signum;
 124
 125                 t = tmp;
 126                 do {
 127                         *t++ = "0123456789"[signum % 10];
 128                 } while (signum /= 10);
 129                 if (num < 0)
 130                         *t++ = '-';
 131
 132                 p = (ebuf + n);
 133                 *p++ = ':';
 134                 *p++ = ' ';
 135
 136                 for (;;) {
 137                         *p++ = *--t;
 138                         if (t <= tmp)
 139                                 break;
 140                 }
 141                 *p = '\0';
 142         }
 143
 144 #if defined(NLS)
 145         catclose(catd);
 146         errno = saved_errno;
 147 #endif
 148         return (ebuf);
 149 }