mirror of https://gitee.com/openkylin/wget.git
52 lines
1.8 KiB
C
52 lines
1.8 KiB
C
/* Convenience declarations when working with <signal.h>.
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Copyright (C) 2008-2019 Free Software Foundation, Inc.
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <https://www.gnu.org/licenses/>. */
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#ifndef _GL_SIG_HANDLER_H
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#define _GL_SIG_HANDLER_H
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#include <signal.h>
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#ifndef _GL_INLINE_HEADER_BEGIN
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#error "Please include config.h first."
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#endif
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_GL_INLINE_HEADER_BEGIN
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#ifndef SIG_HANDLER_INLINE
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# define SIG_HANDLER_INLINE _GL_INLINE
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#endif
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/* Convenience type when working with signal handlers. */
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typedef void (*sa_handler_t) (int);
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/* Return the handler of a signal, as a sa_handler_t value regardless
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of its true type. The resulting function can be compared to
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special values like SIG_IGN but it is not portable to call it. */
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SIG_HANDLER_INLINE sa_handler_t _GL_ATTRIBUTE_PURE
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get_handler (struct sigaction const *a)
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{
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/* POSIX says that special values like SIG_IGN can only occur when
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action.sa_flags does not contain SA_SIGINFO. But in Linux 2.4,
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for example, sa_sigaction and sa_handler are aliases and a signal
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is ignored if sa_sigaction (after casting) equals SIG_IGN. In
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this case, this implementation relies on the fact that the two
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are aliases, and simply returns sa_handler. */
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return a->sa_handler;
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}
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_GL_INLINE_HEADER_END
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#endif /* _GL_SIG_HANDLER_H */
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