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dc6c21da TT |
1 | # signal_h.m4 serial 22 |
2 | dnl Copyright (C) 2007-2022 Free Software Foundation, Inc. | |
0750520d PA |
3 | dnl This file is free software; the Free Software Foundation |
4 | dnl gives unlimited permission to copy and/or distribute it, | |
5 | dnl with or without modifications, as long as this notice is preserved. | |
6 | ||
dc6c21da | 7 | AC_DEFUN_ONCE([gl_SIGNAL_H], |
0750520d PA |
8 | [ |
9 | AC_REQUIRE([gl_SIGNAL_H_DEFAULTS]) | |
10 | AC_REQUIRE([gl_CHECK_TYPE_SIGSET_T]) | |
11 | gl_NEXT_HEADERS([signal.h]) | |
12 | ||
13 | # AIX declares sig_atomic_t to already include volatile, and C89 compilers | |
14 | # then choke on 'volatile sig_atomic_t'. C99 requires that it compile. | |
15 | AC_CHECK_TYPE([volatile sig_atomic_t], [], | |
16 | [HAVE_TYPE_VOLATILE_SIG_ATOMIC_T=0], [[ | |
17 | #include <signal.h> | |
18 | ]]) | |
19 | ||
20 | dnl Ensure the type pid_t gets defined. | |
21 | AC_REQUIRE([AC_TYPE_PID_T]) | |
22 | ||
23 | AC_REQUIRE([AC_TYPE_UID_T]) | |
24 | ||
25 | dnl Persuade glibc <signal.h> to define sighandler_t. | |
26 | AC_REQUIRE([AC_USE_SYSTEM_EXTENSIONS]) | |
27 | AC_CHECK_TYPE([sighandler_t], [], [HAVE_SIGHANDLER_T=0], [[ | |
28 | #include <signal.h> | |
29 | ]]) | |
30 | ||
31 | dnl Check for declarations of anything we want to poison if the | |
32 | dnl corresponding gnulib module is not in use. | |
33 | gl_WARN_ON_USE_PREPARE([[#include <signal.h> | |
34 | ]], [pthread_sigmask sigaction | |
35 | sigaddset sigdelset sigemptyset sigfillset sigismember | |
36 | sigpending sigprocmask]) | |
698be2d8 CB |
37 | |
38 | AC_REQUIRE([AC_C_RESTRICT]) | |
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39 | ]) |
40 | ||
41 | AC_DEFUN([gl_CHECK_TYPE_SIGSET_T], | |
42 | [ | |
43 | AC_CHECK_TYPES([sigset_t], | |
44 | [gl_cv_type_sigset_t=yes], [gl_cv_type_sigset_t=no], | |
45 | [[ | |
46 | #include <signal.h> | |
47 | /* Mingw defines sigset_t not in <signal.h>, but in <sys/types.h>. */ | |
48 | #include <sys/types.h> | |
49 | ]]) | |
50 | if test $gl_cv_type_sigset_t != yes; then | |
51 | HAVE_SIGSET_T=0 | |
52 | fi | |
53 | ]) | |
54 | ||
dc6c21da TT |
55 | # gl_SIGNAL_MODULE_INDICATOR([modulename]) |
56 | # sets the shell variable that indicates the presence of the given module | |
57 | # to a C preprocessor expression that will evaluate to 1. | |
58 | # This macro invocation must not occur in macros that are AC_REQUIREd. | |
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59 | AC_DEFUN([gl_SIGNAL_MODULE_INDICATOR], |
60 | [ | |
dc6c21da TT |
61 | dnl Ensure to expand the default settings once only. |
62 | gl_SIGNAL_H_REQUIRE_DEFAULTS | |
0750520d PA |
63 | gl_MODULE_INDICATOR_SET_VARIABLE([$1]) |
64 | dnl Define it also as a C macro, for the benefit of the unit tests. | |
65 | gl_MODULE_INDICATOR_FOR_TESTS([$1]) | |
66 | ]) | |
67 | ||
dc6c21da TT |
68 | # Initializes the default values for AC_SUBSTed shell variables. |
69 | # This macro must not be AC_REQUIREd. It must only be invoked, and only | |
70 | # outside of macros or in macros that are not AC_REQUIREd. | |
71 | AC_DEFUN([gl_SIGNAL_H_REQUIRE_DEFAULTS], | |
72 | [ | |
73 | m4_defun(GL_MODULE_INDICATOR_PREFIX[_SIGNAL_H_MODULE_INDICATOR_DEFAULTS], [ | |
74 | gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_PTHREAD_SIGMASK]) | |
75 | gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_RAISE]) | |
76 | gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_SIGNAL_H_SIGPIPE]) | |
77 | gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_SIGPROCMASK]) | |
78 | gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_SIGACTION]) | |
79 | ]) | |
80 | m4_require(GL_MODULE_INDICATOR_PREFIX[_SIGNAL_H_MODULE_INDICATOR_DEFAULTS]) | |
81 | AC_REQUIRE([gl_SIGNAL_H_DEFAULTS]) | |
82 | ]) | |
83 | ||
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84 | AC_DEFUN([gl_SIGNAL_H_DEFAULTS], |
85 | [ | |
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86 | dnl Assume proper GNU behavior unless another module says otherwise. |
87 | HAVE_POSIX_SIGNALBLOCKING=1; AC_SUBST([HAVE_POSIX_SIGNALBLOCKING]) | |
88 | HAVE_PTHREAD_SIGMASK=1; AC_SUBST([HAVE_PTHREAD_SIGMASK]) | |
89 | HAVE_RAISE=1; AC_SUBST([HAVE_RAISE]) | |
90 | HAVE_SIGSET_T=1; AC_SUBST([HAVE_SIGSET_T]) | |
91 | HAVE_SIGINFO_T=1; AC_SUBST([HAVE_SIGINFO_T]) | |
92 | HAVE_SIGACTION=1; AC_SUBST([HAVE_SIGACTION]) | |
93 | HAVE_STRUCT_SIGACTION_SA_SIGACTION=1; | |
94 | AC_SUBST([HAVE_STRUCT_SIGACTION_SA_SIGACTION]) | |
95 | HAVE_TYPE_VOLATILE_SIG_ATOMIC_T=1; | |
96 | AC_SUBST([HAVE_TYPE_VOLATILE_SIG_ATOMIC_T]) | |
97 | HAVE_SIGHANDLER_T=1; AC_SUBST([HAVE_SIGHANDLER_T]) | |
98 | REPLACE_PTHREAD_SIGMASK=0; AC_SUBST([REPLACE_PTHREAD_SIGMASK]) | |
99 | REPLACE_RAISE=0; AC_SUBST([REPLACE_RAISE]) | |
100 | ]) |