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annotate lib/signal.in.h @ 10655:8668b19a7032

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Avoid gcc warnings because of #pragma GCC system_header on older gcc.
author Bruno Haible <bruno@clisp.org>
date Sat, 18 Oct 2008 02:43:18 +0200
parents 5a24031ebf7d
children 5a35e8f56744
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1 /* A GNU-like <signal.h>.
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2
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3 Copyright (C) 2006-2008 Free Software Foundation, Inc.
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4
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5 This program is free software: you can redistribute it and/or modify
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6 it under the terms of the GNU General Public License as published by
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7 the Free Software Foundation; either version 3 of the License, or
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8 (at your option) any later version.
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9
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10 This program is distributed in the hope that it will be useful,
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11 but WITHOUT ANY WARRANTY; without even the implied warranty of
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12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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13 GNU General Public License for more details.
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14
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15 You should have received a copy of the GNU General Public License
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16 along with this program. If not, see <http://www.gnu.org/licenses/>. */
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17
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18 #if __GNUC__ >= 3
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19 @PRAGMA_SYSTEM_HEADER@
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20 #endif
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21
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22 #if defined __need_sig_atomic_t || defined __need_sigset_t
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23 /* Special invocation convention inside glibc header files. */
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24
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25 # @INCLUDE_NEXT@ @NEXT_SIGNAL_H@
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26
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27 #else
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28 /* Normal invocation convention. */
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29
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30 #ifndef _GL_SIGNAL_H
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31
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32 /* The include_next requires a split double-inclusion guard. */
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33 #@INCLUDE_NEXT@ @NEXT_SIGNAL_H@
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34
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35 #ifndef _GL_SIGNAL_H
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36 #define _GL_SIGNAL_H
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37
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38 /* The definition of GL_LINK_WARNING is copied here. */
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39
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40 /* Define pid_t, uid_t.
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41 Also, mingw defines sigset_t not in <signal.h>, but in <sys/types.h>. */
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42 #include <sys/types.h>
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43
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44 #ifdef __cplusplus
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45 extern "C" {
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46 #endif
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47
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48
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49 #if @GNULIB_SIGNAL_H_SIGPIPE@
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50 # ifndef SIGPIPE
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51 /* Define SIGPIPE to a value that does not overlap with other signals. */
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52 # define SIGPIPE 13
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53 # define GNULIB_defined_SIGPIPE 1
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54 /* To actually use SIGPIPE, you also need the gnulib modules 'sigprocmask',
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55 'write', 'stdio'. */
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56 # endif
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57 #endif
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58
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59
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60 #if !@HAVE_POSIX_SIGNALBLOCKING@
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61
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62 /* Maximum signal number + 1. */
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63 # ifndef NSIG
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64 # define NSIG 32
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65 # endif
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66
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67 /* This code supports only 32 signals. */
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68 typedef int verify_NSIG_constraint[2 * (NSIG <= 32) - 1];
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69
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70 /* A set or mask of signals. */
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71 # if !@HAVE_SIGSET_T@
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72 typedef unsigned int sigset_t;
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73 # endif
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74
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75 /* Test whether a given signal is contained in a signal set. */
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76 extern int sigismember (const sigset_t *set, int sig);
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77
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78 /* Initialize a signal set to the empty set. */
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79 extern int sigemptyset (sigset_t *set);
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80
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81 /* Add a signal to a signal set. */
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82 extern int sigaddset (sigset_t *set, int sig);
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83
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84 /* Remove a signal from a signal set. */
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85 extern int sigdelset (sigset_t *set, int sig);
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86
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87 /* Fill a signal set with all possible signals. */
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88 extern int sigfillset (sigset_t *set);
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89
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90 /* Return the set of those blocked signals that are pending. */
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91 extern int sigpending (sigset_t *set);
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92
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93 /* If OLD_SET is not NULL, put the current set of blocked signals in *OLD_SET.
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94 Then, if SET is not NULL, affect the current set of blocked signals by
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95 combining it with *SET as indicated in OPERATION.
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96 In this implementation, you are not allowed to change a signal handler
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97 while the signal is blocked. */
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98 # define SIG_BLOCK 0 /* blocked_set = blocked_set | *set; */
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99 # define SIG_SETMASK 1 /* blocked_set = *set; */
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100 # define SIG_UNBLOCK 2 /* blocked_set = blocked_set & ~*set; */
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101 extern int sigprocmask (int operation, const sigset_t *set, sigset_t *old_set);
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102
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103 # define signal rpl_signal
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104 /* Install the handler FUNC for signal SIG, and return the previous
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105 handler. */
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106 extern void (*signal (int sig, void (*func) (int))) (int);
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107
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108 # if GNULIB_defined_SIGPIPE
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109
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110 /* Raise signal SIG. */
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111 # undef raise
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112 # define raise rpl_raise
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113 extern int raise (int sig);
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114
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115 # endif
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116
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117 #endif /* !@HAVE_POSIX_SIGNALBLOCKING@ */
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118
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119
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120 #if !@HAVE_SIGACTION@
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121
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122 # if !@HAVE_SIGINFO_T@
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123 /* Present to allow compilation, but unsupported by gnulib. */
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124 union sigval
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125 {
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126 int sival_int;
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127 void *sival_ptr;
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128 };
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129
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130 /* Present to allow compilation, but unsupported by gnulib. */
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131 struct siginfo_t
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132 {
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133 int si_signo;
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134 int si_code;
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135 int si_errno;
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136 pid_t si_pid;
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137 uid_t si_uid;
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138 void *si_addr;
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139 int si_status;
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140 long si_band;
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141 union sigval si_value;
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142 };
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143 typedef struct siginfo_t siginfo_t;
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144 # endif /* !@HAVE_SIGINFO_T@ */
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145
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146 /* We assume that platforms which lack the sigaction() function also lack
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147 the 'struct sigaction' type, and vice versa. */
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148
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149 struct sigaction
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150 {
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151 union
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152 {
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153 void (*_sa_handler) (int);
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154 /* Present to allow compilation, but unsupported by gnulib. POSIX
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155 says that implementations may, but not must, make sa_sigaction
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156 overlap with sa_handler, but we know of no implementation where
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157 they do not overlap. */
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158 void (*_sa_sigaction) (int, siginfo_t *, void *);
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159 } _sa_func;
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160 sigset_t sa_mask;
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161 /* Not all POSIX flags are supported. */
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162 int sa_flags;
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163 };
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164 # define sa_handler _sa_func._sa_handler
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165 # define sa_sigaction _sa_func._sa_sigaction
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166 /* Unsupported flags are not present. */
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167 # define SA_RESETHAND 1
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168 # define SA_NODEFER 2
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169 # define SA_RESTART 4
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170
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171 extern int sigaction (int, const struct sigaction *restrict,
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172 struct sigaction *restrict);
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173
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174 #elif !@HAVE_STRUCT_SIGACTION_SA_SIGACTION@
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175
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176 # define sa_sigaction sa_handler
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177
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178 #endif /* !@HAVE_SIGACTION@, !@HAVE_STRUCT_SIGACTION_SA_SIGACTION@ */
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179
cda94d6d670f Rename signal_.h to signal.in.h.
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180
cda94d6d670f Rename signal_.h to signal.in.h.
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181 #ifdef __cplusplus
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182 }
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183 #endif
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184
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185 #endif /* _GL_SIGNAL_H */
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186 #endif /* _GL_SIGNAL_H */
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187 #endif