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  1. /*  $NetBSD: error.c,v 1.23 2000/07/03 03:26:19 matt Exp $  */
  2.  
  3. /*-
  4.  * Copyright (c) 1991, 1993
  5.  *  The Regents of the University of California.  All rights reserved.
  6.  *
  7.  * This code is derived from software contributed to Berkeley by
  8.  * Kenneth Almquist.
  9.  *
  10.  * Redistribution and use in source and binary forms, with or without
  11.  * modification, are permitted provided that the following conditions
  12.  * are met:
  13.  * 1. Redistributions of source code must retain the above copyright
  14.  *    notice, this list of conditions and the following disclaimer.
  15.  * 2. Redistributions in binary form must reproduce the above copyright
  16.  *    notice, this list of conditions and the following disclaimer in the
  17.  *    documentation and/or other materials provided with the distribution.
  18.  * 3. All advertising materials mentioning features or use of this software
  19.  *    must display the following acknowledgement:
  20.  *  This product includes software developed by the University of
  21.  *  California, Berkeley and its contributors.
  22.  * 4. Neither the name of the University nor the names of its contributors
  23.  *    may be used to endorse or promote products derived from this software
  24.  *    without specific prior written permission.
  25.  *
  26.  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  27.  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  28.  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  29.  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  30.  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  31.  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  32.  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  33.  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  34.  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  35.  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  36.  * SUCH DAMAGE.
  37.  */
  38.  
  39. #include <sys/cdefs.h>
  40. #ifndef lint
  41. #if 0
  42. static char sccsid[] = "@(#)error.c 8.2 (Berkeley) 5/4/95";
  43. #else
  44. __RCSID("$NetBSD: error.c,v 1.23 2000/07/03 03:26:19 matt Exp $");
  45. #endif
  46. #endif /* not lint */
  47.  
  48. /*
  49.  * Errors and exceptions.
  50.  */
  51.  
  52. #include <signal.h>
  53. #include <stdlib.h>
  54. #include <unistd.h>
  55. #include <errno.h>
  56.  
  57. #include "shell.h"
  58. #include "main.h"
  59. #include "options.h"
  60. #include "output.h"
  61. #include "error.h"
  62. #include "show.h"
  63.  
  64.  
  65. /*
  66.  * Code to handle exceptions in C.
  67.  */
  68.  
  69. struct jmploc *handler;
  70. int exception;
  71. volatile int suppressint;
  72. volatile int intpending;
  73. char *commandname;
  74.  
  75.  
  76. static void exverror (int, const char *, va_list)
  77.     __attribute__((__noreturn__));
  78.  
  79. /*
  80.  * Called to raise an exception.  Since C doesn't include exceptions, we
  81.  * just do a longjmp to the exception handler.  The type of exception is
  82.  * stored in the global variable "exception".
  83.  */
  84.  
  85. void
  86. exraise(e)
  87.     int e;
  88. {
  89.     if (handler == NULL)
  90.         abort();
  91.     exception = e;
  92.     longjmp(handler->loc, 1);
  93. }
  94.  
  95.  
  96. /*
  97.  * Called from trap.c when a SIGINT is received.  (If the user specifies
  98.  * that SIGINT is to be trapped or ignored using the trap builtin, then
  99.  * this routine is not called.)  Suppressint is nonzero when interrupts
  100.  * are held using the INTOFF macro.  The call to _exit is necessary because
  101.  * there is a short period after a fork before the signal handlers are
  102.  * set to the appropriate value for the child.  (The test for iflag is
  103.  * just defensive programming.)
  104.  */
  105.  
  106. void
  107. onint() {
  108.     sigset_t sigset;
  109.  
  110.     if (suppressint) {
  111.         intpending++;
  112.         return;
  113.     }
  114.     intpending = 0;
  115.     sigemptyset(&sigset);
  116.     sigprocmask(SIG_SETMASK, &sigset, NULL);
  117.     if (rootshell && iflag)
  118.         exraise(EXINT);
  119.     else {
  120.         signal(SIGINT, SIG_DFL);
  121.         raise(SIGINT);
  122.     }
  123.     /* NOTREACHED */
  124. }
  125.  
  126.  
  127. /*
  128.  * Exverror is called to raise the error exception.  If the first argument
  129.  * is not NULL then error prints an error message using printf style
  130.  * formatting.  It then raises the error exception.
  131.  */
  132. static void
  133. exverror(cond, msg, ap)
  134.     int cond;
  135.     const char *msg;
  136.     va_list ap;
  137. {
  138.     CLEAR_PENDING_INT;
  139.     INTOFF;
  140.  
  141. #ifdef DEBUG
  142.     if (msg)
  143.         TRACE(("exverror(%d, \"%s\") pid=%d\n", cond, msg, getpid()));
  144.     else
  145.         TRACE(("exverror(%d, NULL) pid=%d\n", cond, getpid()));
  146. #endif
  147.     if (msg) {
  148.         if (commandname)
  149.             outfmt(&errout, "%s: ", commandname);
  150.         doformat(&errout, msg, ap);
  151.         out2c('\n');
  152.     }
  153.     flushall();
  154.     exraise(cond);
  155.     /* NOTREACHED */
  156. }
  157.  
  158.  
  159. #ifdef __STDC__
  160. void
  161. error(const char *msg, ...)
  162. #else
  163. void
  164. error(va_alist)
  165.     va_dcl
  166. #endif
  167. {
  168. #ifndef __STDC__
  169.     const char *msg;
  170. #endif
  171.     va_list ap;
  172. #ifdef __STDC__
  173.     va_start(ap, msg);
  174. #else
  175.     va_start(ap);
  176.     msg = va_arg(ap, const char *);
  177. #endif
  178.     exverror(EXERROR, msg, ap);
  179.     /* NOTREACHED */
  180.     va_end(ap);
  181. }
  182.  
  183.  
  184. #ifdef __STDC__
  185. void
  186. exerror(int cond, const char *msg, ...)
  187. #else
  188. void
  189. exerror(va_alist)
  190.     va_dcl
  191. #endif
  192. {
  193. #ifndef __STDC__
  194.     int cond;
  195.     const char *msg;
  196. #endif
  197.     va_list ap;
  198. #ifdef __STDC__
  199.     va_start(ap, msg);
  200. #else
  201.     va_start(ap);
  202.     cond = va_arg(ap, int);
  203.     msg = va_arg(ap, const char *);
  204. #endif
  205.     exverror(cond, msg, ap);
  206.     /* NOTREACHED */
  207.     va_end(ap);
  208. }
  209.  
  210.  
  211.  
  212. /*
  213.  * Table of error messages.
  214.  */
  215.  
  216. struct errname {
  217.     short errcode;      /* error number */
  218.     short action;       /* operation which encountered the error */
  219.     const char *msg;    /* text describing the error */
  220. };
  221.  
  222.  
  223. #define ALL (E_OPEN|E_CREAT|E_EXEC)
  224.  
  225. STATIC const struct errname errormsg[] = {
  226.     { EINTR,    ALL,    "interrupted" },
  227.     { EACCES,   ALL,    "permission denied" },
  228.     { EIO,      ALL,    "I/O error" },
  229.     { ENOENT,   E_OPEN, "no such file" },
  230.     { ENOENT,   E_CREAT,"directory nonexistent" },
  231.     { ENOENT,   E_EXEC, "not found" },
  232.     { ENOTDIR,  E_OPEN, "no such file" },
  233.     { ENOTDIR,  E_CREAT,"directory nonexistent" },
  234.     { ENOTDIR,  E_EXEC, "not found" },
  235.     { EISDIR,   ALL,    "is a directory" },
  236.     { EEXIST,   E_CREAT,"file exists" },
  237. #ifdef notdef
  238.     { EMFILE,   ALL,    "too many open files" },
  239. #endif
  240.     { ENFILE,   ALL,    "file table overflow" },
  241.     { ENOSPC,   ALL,    "file system full" },
  242. #ifdef EDQUOT
  243.     { EDQUOT,   ALL,    "disk quota exceeded" },
  244. #endif
  245. #ifdef ENOSR
  246.     { ENOSR,    ALL,    "no streams resources" },
  247. #endif
  248.     { ENXIO,    ALL,    "no such device or address" },
  249.     { EROFS,    ALL,    "read-only file system" },
  250.     { ETXTBSY,  ALL,    "text busy" },
  251. #ifdef SYSV
  252.     { EAGAIN,   E_EXEC, "not enough memory" },
  253. #endif
  254.     { ENOMEM,   ALL,    "not enough memory" },
  255. #ifdef ENOLINK
  256.     { ENOLINK,  ALL,    "remote access failed" },
  257. #endif
  258. #ifdef EMULTIHOP
  259.     { EMULTIHOP,    ALL,    "remote access failed" },
  260. #endif
  261. #ifdef ECOMM
  262.     { ECOMM,    ALL,    "remote access failed" },
  263. #endif
  264. #ifdef ESTALE
  265.     { ESTALE,   ALL,    "remote access failed" },
  266. #endif
  267. #ifdef ETIMEDOUT
  268.     { ETIMEDOUT,    ALL,    "remote access failed" },
  269. #endif
  270. #ifdef ELOOP
  271.     { ELOOP,    ALL,    "symbolic link loop" },
  272. #endif
  273.     { E2BIG,    E_EXEC, "argument list too long" },
  274. #ifdef ELIBACC
  275.     { ELIBACC,  E_EXEC, "shared library missing" },
  276. #endif
  277.     { 0,        0,  NULL },
  278. };
  279.  
  280.  
  281. /*
  282.  * Return a string describing an error.  The returned string may be a
  283.  * pointer to a static buffer that will be overwritten on the next call.
  284.  * Action describes the operation that got the error.
  285.  */
  286.  
  287. const char *
  288. errmsg(e, action)
  289.     int e;
  290.     int action;
  291. {
  292.     struct errname const *ep;
  293.     static char buf[12];
  294.  
  295.     for (ep = errormsg ; ep->errcode ; ep++) {
  296.         if (ep->errcode == e && (ep->action & action) != 0)
  297.             return ep->msg;
  298.     }
  299.     fmtstr(buf, sizeof buf, "error %d", e);
  300.     return buf;
  301. }
  302.