string/FreeBSD/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  * 4. 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
  30 #if defined(LIBC_SCCS) && !defined(lint)
  31 static char sccsid[] = "@(#)strerror.c  8.1 (Berkeley) 6/4/93";
  32 #endif /* LIBC_SCCS and not lint */
  33 #include <sys/cdefs.h>
  34 __FBSDID("$FreeBSD: src/lib/libc/string/strsignal.c,v 1.9 2010/01/24 10:35:26 ume Exp $");
  35
  36 #include "namespace.h"
  37 #if defined(NLS)
  38 #include <nl_types.h>
  39 #endif
  40 #include <limits.h>
  41 #include <errno.h>
  42 #include <stdlib.h>
  43 #include <string.h>
  44 #include <signal.h>
  45 #include "reentrant.h"
  46 #include "un-namespace.h"
  47
  48 #define UPREFIX         "Unknown signal"
  49
  50 static char             sig_ebuf[NL_TEXTMAX];
  51 static char             sig_ebuf_err[NL_TEXTMAX];
  52 static once_t           sig_init_once = ONCE_INITIALIZER;
  53 static thread_key_t     sig_key;
  54 static int              sig_keycreated = 0;
  55
  56 static void
  57 sig_keycreate(void)
  58 {
  59         sig_keycreated = (thr_keycreate(&sig_key, free) == 0);
  60 }
  61
  62 static char *
  63 sig_tlsalloc(void)
  64 {
  65         char *ebuf = NULL;
  66
  67         if (thr_main() != 0)
  68                 ebuf = sig_ebuf;
  69         else {
  70                 if (thr_once(&sig_init_once, sig_keycreate) != 0 ||
  71                     !sig_keycreated)
  72                         goto thr_err;
  73                 if ((ebuf = thr_getspecific(sig_key)) == NULL) {
  74                         if ((ebuf = malloc(sizeof(sig_ebuf))) == NULL)
  75                                 goto thr_err;
  76                         if (thr_setspecific(sig_key, ebuf) != 0) {
  77                                 free(ebuf);
  78                                 ebuf = NULL;
  79                                 goto thr_err;
  80                         }
  81                 }
  82         }
  83 thr_err:
  84         if (ebuf == NULL)
  85                 ebuf = sig_ebuf_err;
  86         return (ebuf);
  87 }
  88
  89 /* XXX: negative 'num' ? (REGR) */
  90 char *
  91 strsignal(int num)
  92 {
  93         char *ebuf;
  94         char tmp[20];
  95         size_t n;
  96         int signum;
  97         char *t, *p;
  98
  99 #if defined(NLS)
 100         int saved_errno = errno;
 101         nl_catd catd;
 102         catd = catopen("libc", NL_CAT_LOCALE);
 103 #endif
 104
 105         ebuf = sig_tlsalloc();
 106
 107         if (num > 0 && num < sys_nsig) {
 108                 n = strlcpy(ebuf,
 109 #if defined(NLS)
 110                         catgets(catd, 2, num, sys_siglist[num]),
 111 #else
 112                         sys_siglist[num],
 113 #endif
 114                         sizeof(sig_ebuf));
 115         } else {
 116                 n = strlcpy(ebuf,
 117 #if defined(NLS)
 118                         catgets(catd, 2, 0xffff, UPREFIX),
 119 #else
 120                         UPREFIX,
 121 #endif
 122                         sizeof(sig_ebuf));
 123         }
 124
 125         signum = num;
 126         if (num < 0)
 127                 signum = -signum;
 128
 129         t = tmp;
 130         do {
 131                 *t++ = "0123456789"[signum % 10];
 132         } while (signum /= 10);
 133         if (num < 0)
 134                 *t++ = '-';
 135
 136         p = (ebuf + n);
 137         *p++ = ':';
 138         *p++ = ' ';
 139
 140         for (;;) {
 141                 *p++ = *--t;
 142                 if (t <= tmp)
 143                         break;
 144         }
 145         *p = '\0';
 146
 147 #if defined(NLS)
 148         catclose(catd);
 149         errno = saved_errno;
 150 #endif
 151         return (ebuf);
 152 }