contrib/libarchive/tar/siginfo.c

   1 /*-
   2  * Copyright 2008 Colin Percival
   3  * 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  *
  14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) ``AS IS'' AND ANY EXPRESS OR
  15  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  16  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  17  * IN NO EVENT SHALL THE AUTHOR(S) BE LIABLE FOR ANY DIRECT, INDIRECT,
  18  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  19  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  20  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  21  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  22  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  23  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  24  */
  25
  26 #include "bsdtar_platform.h"
  27 __FBSDID("$FreeBSD: src/usr.bin/tar/siginfo.c,v 1.2 2008/05/22 21:08:36 cperciva Exp $");
  28
  29 #include <errno.h>
  30 #include <signal.h>
  31 #include <stdio.h>
  32 #include <stdlib.h>
  33 #include <string.h>
  34
  35 #include "bsdtar.h"
  36
  37 /* Is there a pending SIGINFO or SIGUSR1? */
  38 static volatile sig_atomic_t siginfo_received = 0;
  39
  40 struct siginfo_data {
  41         /* What sort of operation are we doing? */
  42         char * oper;
  43
  44         /* What path are we handling? */
  45         char * path;
  46
  47         /* How large is the archive entry? */
  48         int64_t size;
  49
  50         /* Old signal handlers. */
  51 #ifdef SIGINFO
  52         void (*siginfo_old)(int);
  53 #endif
  54         void (*sigusr1_old)(int);
  55 };
  56
  57 static void              siginfo_handler(int sig);
  58
  59 /* Handler for SIGINFO / SIGUSR1. */
  60 static void
  61 siginfo_handler(int sig)
  62 {
  63
  64         (void)sig; /* UNUSED */
  65
  66         /* Record that SIGINFO or SIGUSR1 has been received. */
  67         siginfo_received = 1;
  68 }
  69
  70 void
  71 siginfo_init(struct bsdtar *bsdtar)
  72 {
  73
  74         /* Allocate space for internal structure. */
  75         if ((bsdtar->siginfo = malloc(sizeof(struct siginfo_data))) == NULL)
  76                 bsdtar_errc(bsdtar, 1, errno, "malloc failed");
  77
  78         /* Set the strings to NULL so that free() is safe. */
  79         bsdtar->siginfo->path = bsdtar->siginfo->oper = NULL;
  80
  81 #ifdef SIGINFO
  82         /* We want to catch SIGINFO, if it exists. */
  83         bsdtar->siginfo->siginfo_old = signal(SIGINFO, siginfo_handler);
  84 #endif
  85 #ifdef SIGUSR1
  86         /* ... and treat SIGUSR1 the same way as SIGINFO. */
  87         bsdtar->siginfo->sigusr1_old = signal(SIGUSR1, siginfo_handler);
  88 #endif
  89 }
  90
  91 void
  92 siginfo_setinfo(struct bsdtar *bsdtar, const char * oper, const char * path,
  93     int64_t size)
  94 {
  95
  96         /* Free old operation and path strings. */
  97         free(bsdtar->siginfo->oper);
  98         free(bsdtar->siginfo->path);
  99
 100         /* Duplicate strings and store entry size. */
 101         if ((bsdtar->siginfo->oper = strdup(oper)) == NULL)
 102                 bsdtar_errc(bsdtar, 1, errno, "Cannot strdup");
 103         if ((bsdtar->siginfo->path = strdup(path)) == NULL)
 104                 bsdtar_errc(bsdtar, 1, errno, "Cannot strdup");
 105         bsdtar->siginfo->size = size;
 106 }
 107
 108 void
 109 siginfo_printinfo(struct bsdtar *bsdtar, off_t progress)
 110 {
 111
 112         /* If there's a signal to handle and we know what we're doing... */
 113         if ((siginfo_received == 1) &&
 114             (bsdtar->siginfo->path != NULL) &&
 115             (bsdtar->siginfo->oper != NULL)) {
 116                 if (bsdtar->verbose)
 117                         fprintf(stderr, "\n");
 118                 if (bsdtar->siginfo->size > 0) {
 119                         safe_fprintf(stderr, "%s %s (%ju / %" PRId64 ")",
 120                             bsdtar->siginfo->oper, bsdtar->siginfo->path,
 121                             (uintmax_t)progress, bsdtar->siginfo->size);
 122                 } else {
 123                         safe_fprintf(stderr, "%s %s",
 124                             bsdtar->siginfo->oper, bsdtar->siginfo->path);
 125                 }
 126                 if (!bsdtar->verbose)
 127                         fprintf(stderr, "\n");
 128                 siginfo_received = 0;
 129         }
 130 }
 131
 132 void
 133 siginfo_done(struct bsdtar *bsdtar)
 134 {
 135
 136 #ifdef SIGINFO
 137         /* Restore old SIGINFO handler. */
 138         signal(SIGINFO, bsdtar->siginfo->siginfo_old);
 139 #endif
 140 #ifdef SIGUSR1
 141         /* And the old SIGUSR1 handler, too. */
 142         signal(SIGUSR1, bsdtar->siginfo->sigusr1_old);
 143 #endif
 144
 145         /* Free strings. */
 146         free(bsdtar->siginfo->path);
 147         free(bsdtar->siginfo->oper);
 148
 149         /* Free internal data structure. */
 150         free(bsdtar->siginfo);
 151 }