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annotate io.c @ 33:fa93d2ff9c62

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Prevent potential division by zero Add safeguard ensuring that there is at least one possible character to generate passwords from in order to exclude the possibility of a division by zero error in rand_uniform.
author Guido Berhoerster <guido+pwm@berhoerster.name>
date Tue, 30 Jul 2019 20:38:08 +0200
parents ec01c579024a
children 131c35592054
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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19
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1 /*
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2 * Copyright (C) 2017 Guido Berhoerster <guido+pwm@berhoerster.name>
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3 *
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4 * Permission is hereby granted, free of charge, to any person obtaining
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5 * a copy of this software and associated documentation files (the
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6 * "Software"), to deal in the Software without restriction, including
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7 * without limitation the rights to use, copy, modify, merge, publish,
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8 * distribute, sublicense, and/or sell copies of the Software, and to
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9 * permit persons to whom the Software is furnished to do so, subject to
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10 * the following conditions:
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11 *
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12 * The above copyright notice and this permission notice shall be included
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13 * in all copies or substantial portions of the Software.
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14 *
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15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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16 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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17 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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18 * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
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19 * CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
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20 * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
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21 * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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22 */
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23
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24 #include "compat.h"
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25
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26 #ifdef HAVE_ERR_H
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27 #include <err.h>
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28 #endif /* HAVE_ERR_H */
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29 #include <errno.h>
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30 #include <setjmp.h>
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31 #include <signal.h>
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32 #include <stdarg.h>
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33 #include <stdio.h>
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34 #include <stdio.h>
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35 #include <string.h>
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36 #include <unistd.h>
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37
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38 #include "io.h"
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39 #include "util.h"
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40 #include "pwm.h"
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41
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42 static sigjmp_buf signal_env;
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43
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44 static void
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45 signal_handler(int signal_no)
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46 {
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47 siglongjmp(signal_env, signal_no);
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48 }
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49
22
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50 void
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51 io_trim_nl(char *s)
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52 {
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53 size_t len;
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54
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55 len = strlen(s);
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56 if ((len > 0) && (s[len - 1] == '\n')) {
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57 s[len - 1] = '\0';
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58 }
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59 }
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60
19
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61 int
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62 io_gl_complete_nothing(WordCompletion *cpl, void *data, const char *line,
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63 int word_end)
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64 {
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65 return (0);
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66 }
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67
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68 enum io_status
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69 io_get_char(const char *prompt, int *cp)
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70 {
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71 enum io_status retval = IO_OK;
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72 GetLine *gl = NULL;
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73
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74 gl = new_GetLine(16, 0);
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75 if (gl== NULL) {
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76 err(1, "new_GetLine");
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77 }
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78 gl_catch_blocked(gl);
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79
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80 /* prompt with echo off */
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81 gl_echo_mode(gl, 0);
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82 if ((*cp = gl_query_char(gl, prompt, '\0')) == EOF) {
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83 switch (gl_return_status(gl)) {
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84 case GLR_SIGNAL:
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85 retval = IO_SIGNAL;
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86 break;
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87 case GLR_ERROR:
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88 errx(1, "gl_get_line: %s",
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89 gl_error_message(gl, NULL, 0));
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90 default:
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91 errx(1, "unknown error in gl_get_line");
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92 }
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93 }
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94
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95 /* erase prompt */
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96 if (io_printf("\r%*s\r", (int)strlen(prompt), "") == IO_SIGNAL) {
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97 retval = IO_SIGNAL;
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98 }
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99
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100 del_GetLine(gl);
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101
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102 return (retval);
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103 }
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104
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105 enum io_status
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106 io_get_line(GetLine *gl, const char *prompt, int with_history,
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107 const char *start_line, int start_pos, size_t buf_size, char *buf)
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108 {
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109 enum io_status retval = IO_OK;
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110 GetLine *gl_private = NULL;
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111 GlHistoryState state;
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112 char *line;
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113
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114 if (gl == NULL) {
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115 gl = gl_private = new_GetLine(buf_size - 1, 0);
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116 if (gl_private == NULL) {
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117 err(1, "new_GetLine");
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118 }
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119 gl_catch_blocked(gl_private);
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120 }
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121
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122 gl_state_of_history(gl, &state);
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123 gl_toggle_history(gl, with_history);
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124
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125 line = gl_get_line(gl, prompt, start_line, start_pos);
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126 if (line == NULL) {
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127 switch (gl_return_status(gl)) {
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128 case GLR_BLOCKED:
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129 break;
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130 case GLR_SIGNAL:
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131 retval = IO_SIGNAL;
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132 goto out;
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133 case GLR_EOF:
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134 retval = IO_EOF;
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135 goto out;
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136 case GLR_ERROR:
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137 errx(1, "gl_get_line: %s",
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138 gl_error_message(gl, NULL, 0));
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139 default:
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140 errx(1, "unknown error in gl_get_line");
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141 }
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142 }
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143
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144 if (snprintf(buf, buf_size, "%s", line) >= (int)buf_size) {
5c6155c8e9b6 Handle signals
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
145 retval = IO_TRUNCATED;
5c6155c8e9b6 Handle signals
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
146 }
5c6155c8e9b6 Handle signals
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
147
5c6155c8e9b6 Handle signals
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
148 out:
5c6155c8e9b6 Handle signals
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
149 if (gl != NULL) {
5c6155c8e9b6 Handle signals
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
150 gl_toggle_history(gl, state.enabled);
5c6155c8e9b6 Handle signals
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
151 }
5c6155c8e9b6 Handle signals
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
152 del_GetLine(gl_private);
5c6155c8e9b6 Handle signals
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
153
5c6155c8e9b6 Handle signals
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
154 return (retval);
5c6155c8e9b6 Handle signals
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
155 }
5c6155c8e9b6 Handle signals
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
156
5c6155c8e9b6 Handle signals
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
157 enum io_status
5c6155c8e9b6 Handle signals
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
158 io_get_password(const char *prompt, const char *confirm_prompt,
5c6155c8e9b6 Handle signals
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
159 size_t buf_size, char *buf)
5c6155c8e9b6 Handle signals
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
160 {
5c6155c8e9b6 Handle signals
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
161 enum io_status retval = IO_OK;
5c6155c8e9b6 Handle signals
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
162 GetLine *gl = NULL;
5c6155c8e9b6 Handle signals
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
163 size_t len;
5c6155c8e9b6 Handle signals
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
164 char *password_buf = NULL;
5c6155c8e9b6 Handle signals
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
165 char *confirm_buf = NULL;
5c6155c8e9b6 Handle signals
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
166
5c6155c8e9b6 Handle signals
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
167 gl = new_GetLine(buf_size - 1, 0);
5c6155c8e9b6 Handle signals
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
168 if (gl == NULL) {
5c6155c8e9b6 Handle signals
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
169 err(1, "new_GetLine");
5c6155c8e9b6 Handle signals
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
170 }
5c6155c8e9b6 Handle signals
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
171 /* disable default filename completion */
5c6155c8e9b6 Handle signals
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
172 gl_customize_completion(gl, NULL, io_gl_complete_nothing);
5c6155c8e9b6 Handle signals
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
173 gl_echo_mode(gl, 0);
5c6155c8e9b6 Handle signals
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
174
5c6155c8e9b6 Handle signals
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
175 password_buf = xmalloc(buf_size);
5c6155c8e9b6 Handle signals
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
176
5c6155c8e9b6 Handle signals
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
177 if (io_get_line(gl, prompt, 0, NULL, 0, buf_size, password_buf) ==
5c6155c8e9b6 Handle signals
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
178 IO_SIGNAL) {
5c6155c8e9b6 Handle signals
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
179 retval = IO_SIGNAL;
5c6155c8e9b6 Handle signals
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
180 goto out;
5c6155c8e9b6 Handle signals
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
181 }
5c6155c8e9b6 Handle signals
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
182 len = strlen(password_buf);
5c6155c8e9b6 Handle signals
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
183 /* strip trailing newline */
5c6155c8e9b6 Handle signals
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
184 if ((len > 0) && (password_buf[len - 1] == '\n')) {
5c6155c8e9b6 Handle signals
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
185 password_buf[--len] = '\0';
5c6155c8e9b6 Handle signals
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
186 }
5c6155c8e9b6 Handle signals
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
187 if (len == 0) {
5c6155c8e9b6 Handle signals
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
188 retval = IO_PASSWORD_EMPTY;
5c6155c8e9b6 Handle signals
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
189 goto out;
5c6155c8e9b6 Handle signals
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
190 }
5c6155c8e9b6 Handle signals
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
191
5c6155c8e9b6 Handle signals
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
192 if (confirm_prompt != NULL) {
5c6155c8e9b6 Handle signals
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
193 if (io_printf("\n") == IO_SIGNAL) {
5c6155c8e9b6 Handle signals
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
194 retval = IO_SIGNAL;
5c6155c8e9b6 Handle signals
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
195 goto out;
5c6155c8e9b6 Handle signals
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
196 }
5c6155c8e9b6 Handle signals
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
197
5c6155c8e9b6 Handle signals
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
198 /* confirm new password */
5c6155c8e9b6 Handle signals
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
199 confirm_buf = xmalloc(buf_size);
5c6155c8e9b6 Handle signals
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
200 if (io_get_line(gl, confirm_prompt, 0, NULL, 0,
5c6155c8e9b6 Handle signals
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
201 buf_size, confirm_buf) == IO_SIGNAL) {
5c6155c8e9b6 Handle signals
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
202 retval = IO_SIGNAL;
5c6155c8e9b6 Handle signals
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
203 goto out;
5c6155c8e9b6 Handle signals
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
204 }
5c6155c8e9b6 Handle signals
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
205 len = strlen(confirm_buf);
5c6155c8e9b6 Handle signals
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
206 /* strip trailing newline */
5c6155c8e9b6 Handle signals
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
207 if ((len > 0) && (confirm_buf[len - 1] == '\n')) {
5c6155c8e9b6 Handle signals
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
208 confirm_buf[--len] = '\0';
5c6155c8e9b6 Handle signals
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
209 }
5c6155c8e9b6 Handle signals
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
210 if (strcmp(password_buf, confirm_buf) != 0) {
5c6155c8e9b6 Handle signals
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
211 retval = IO_PASSWORD_MISMATCH;
5c6155c8e9b6 Handle signals
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
212 goto out;
5c6155c8e9b6 Handle signals
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
213 }
5c6155c8e9b6 Handle signals
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
214 }
5c6155c8e9b6 Handle signals
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
215
5c6155c8e9b6 Handle signals
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
216 strcpy(buf, password_buf);
5c6155c8e9b6 Handle signals
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
217
5c6155c8e9b6 Handle signals
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
218 out:
5c6155c8e9b6 Handle signals
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
219 if (io_printf("\n") == IO_SIGNAL) {
5c6155c8e9b6 Handle signals
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
220 retval = IO_SIGNAL;
5c6155c8e9b6 Handle signals
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
221 goto out;
5c6155c8e9b6 Handle signals
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
222 }
5c6155c8e9b6 Handle signals
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
223 free(password_buf);
5c6155c8e9b6 Handle signals
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
224 free(confirm_buf);
5c6155c8e9b6 Handle signals
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
225 del_GetLine(gl);
5c6155c8e9b6 Handle signals
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
226
5c6155c8e9b6 Handle signals
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
227 return (retval);
5c6155c8e9b6 Handle signals
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
228 }
5c6155c8e9b6 Handle signals
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
229
5c6155c8e9b6 Handle signals
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
230 enum io_status
5c6155c8e9b6 Handle signals
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
231 io_dputs(int fd, const char *s)
5c6155c8e9b6 Handle signals
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
232 {
5c6155c8e9b6 Handle signals
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
233 struct sigaction action;
5c6155c8e9b6 Handle signals
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
234 struct sigaction oaction;
5c6155c8e9b6 Handle signals
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
235 int signal_no = 0;
5c6155c8e9b6 Handle signals
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
236 const char *p = s;
5c6155c8e9b6 Handle signals
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
237 size_t remaining;
5c6155c8e9b6 Handle signals
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
238 ssize_t n;
5c6155c8e9b6 Handle signals
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
239
5c6155c8e9b6 Handle signals
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
240 /* install signal handlers */
5c6155c8e9b6 Handle signals
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
241 action.sa_handler = signal_handler;
5c6155c8e9b6 Handle signals
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
242 action.sa_flags = 0;
5c6155c8e9b6 Handle signals
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
243 sigemptyset(&action.sa_mask);
5c6155c8e9b6 Handle signals
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
244 sigaddset(&action.sa_mask, SIGINT);
5c6155c8e9b6 Handle signals
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
245 sigaddset(&action.sa_mask, SIGTERM);
5c6155c8e9b6 Handle signals
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
246 sigaddset(&action.sa_mask, SIGHUP);
5c6155c8e9b6 Handle signals
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
247 sigaddset(&action.sa_mask, SIGQUIT);
5c6155c8e9b6 Handle signals
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
248 if ((sigaction(SIGINT, &action, &oaction) != 0) ||
5c6155c8e9b6 Handle signals
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
249 (sigaction(SIGTERM, &action, &oaction) != 0) ||
5c6155c8e9b6 Handle signals
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
250 (sigaction(SIGHUP, &action, &oaction) != 0) ||
5c6155c8e9b6 Handle signals
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
251 (sigaction(SIGQUIT, &action, &oaction) != 0)) {
5c6155c8e9b6 Handle signals
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
252 err(1, "sigaction");
5c6155c8e9b6 Handle signals
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
253 }
5c6155c8e9b6 Handle signals
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
254
5c6155c8e9b6 Handle signals
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
255 if ((signal_no = sigsetjmp(signal_env, 1)) != 0) {
5c6155c8e9b6 Handle signals
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
256 /* signal received, signal mask has been restored */
5c6155c8e9b6 Handle signals
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
257 goto out;
5c6155c8e9b6 Handle signals
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
258 }
5c6155c8e9b6 Handle signals
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
259
5c6155c8e9b6 Handle signals
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
260 remaining = strlen(s);
5c6155c8e9b6 Handle signals
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
261 while (remaining > 0) {
5c6155c8e9b6 Handle signals
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
262 pwm_unblock_signals();
5c6155c8e9b6 Handle signals
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
263 n = write(fd, p, remaining);
5c6155c8e9b6 Handle signals
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
264 if ((n < (int)remaining) && (errno != EINTR)) {
5c6155c8e9b6 Handle signals
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
265 err(1, "write");
5c6155c8e9b6 Handle signals
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
266 }
5c6155c8e9b6 Handle signals
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
267 pwm_block_signals();
5c6155c8e9b6 Handle signals
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
268 remaining -= MAX(n, 0);
5c6155c8e9b6 Handle signals
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
269 p += MAX(n, 0);
5c6155c8e9b6 Handle signals
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
270 }
5c6155c8e9b6 Handle signals
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
271
5c6155c8e9b6 Handle signals
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
272 out:
5c6155c8e9b6 Handle signals
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
273 /* restore signal handlers */
5c6155c8e9b6 Handle signals
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
274 if ((sigaction(SIGINT, &oaction, NULL) != 0) ||
5c6155c8e9b6 Handle signals
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
275 (sigaction(SIGTERM, &oaction, NULL) != 0) ||
5c6155c8e9b6 Handle signals
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
276 (sigaction(SIGHUP, &oaction, NULL) != 0) ||
5c6155c8e9b6 Handle signals
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
277 (sigaction(SIGQUIT, &oaction, NULL) != 0)) {
5c6155c8e9b6 Handle signals
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
278 err(1, "sigaction");
5c6155c8e9b6 Handle signals
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
279 }
5c6155c8e9b6 Handle signals
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
280
5c6155c8e9b6 Handle signals
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
281 return ((signal_no == 0) ? IO_OK : IO_SIGNAL);
5c6155c8e9b6 Handle signals
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
282 }
5c6155c8e9b6 Handle signals
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
283
5c6155c8e9b6 Handle signals
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
284 enum io_status
5c6155c8e9b6 Handle signals
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
285 io_vdprintf(int fd, const char *fmt, va_list args)
5c6155c8e9b6 Handle signals
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
286 {
5c6155c8e9b6 Handle signals
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
287 enum io_status retval;
5c6155c8e9b6 Handle signals
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
288 char *buf;
5c6155c8e9b6 Handle signals
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
289
5c6155c8e9b6 Handle signals
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
290 xvasprintf(&buf, fmt, args);
5c6155c8e9b6 Handle signals
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
291 retval = io_dputs(fd, buf);
5c6155c8e9b6 Handle signals
Guido Berhoerster <guido+pwm@berhoerster.name>
parents:
diff changeset
292 free(buf);
5c6155c8e9b6 Handle signals
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293
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294 return (retval);
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295 }
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296
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297 enum io_status
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298 io_dprintf(int fd, const char *fmt, ...)
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299 {
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300 enum io_status retval;
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301 va_list args;
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302
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303 va_start(args, fmt);
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304 retval = io_vdprintf(fd, fmt, args);
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305 va_end(args);
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306
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307 return (retval);
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308 }
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309
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310 enum io_status
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311 io_printf(const char *fmt, ...)
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312 {
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313 enum io_status retval;
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314 va_list args;
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315
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316 va_start(args, fmt);
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317 retval = io_vdprintf(STDOUT_FILENO, fmt, args);
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318 va_end(args);
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319
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320 return (retval);
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321 }