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118 lines
2.9 KiB
C++
118 lines
2.9 KiB
C++
/* Utility for handling interrupted syscalls by signals.
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Copyright (C) 2020-2024 Free Software Foundation, Inc.
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This file is part of GDB.
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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 <http://www.gnu.org/licenses/>. */
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#ifndef GDBSUPPORT_EINTR_H
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#define GDBSUPPORT_EINTR_H
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#include <cerrno>
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#include <sys/types.h>
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#include <sys/wait.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <unistd.h>
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namespace gdb
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{
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/* Repeat a system call interrupted with a signal.
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A utility for handling interrupted syscalls, which return with error
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and set the errno to EINTR. The interrupted syscalls can be repeated,
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until successful completion. This utility avoids wrapping code with
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manual checks for such errors which are highly repetitive.
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For example, with:
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ssize_t ret;
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do
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{
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errno = 0;
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ret = ::write (pipe[1], "+", 1);
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}
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while (ret == -1 && errno == EINTR);
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You could wrap it by writing the wrapped form:
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ssize_t ret = gdb::handle_eintr (-1, ::write, pipe[1], "+", 1);
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ERRVAL specifies the failure value indicating that the call to the
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F function with ARGS... arguments was possibly interrupted with a
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signal. */
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template<typename ErrorValType, typename Fun, typename... Args>
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inline auto
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handle_eintr (ErrorValType errval, const Fun &f, const Args &... args)
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-> decltype (f (args...))
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{
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decltype (f (args...)) ret;
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do
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{
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errno = 0;
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ret = f (args...);
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}
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while (ret == errval && errno == EINTR);
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return ret;
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}
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inline pid_t
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waitpid (pid_t pid, int *wstatus, int options)
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{
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return gdb::handle_eintr (-1, ::waitpid, pid, wstatus, options);
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}
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inline int
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open (const char *pathname, int flags)
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{
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return gdb::handle_eintr (-1, ::open, pathname, flags);
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}
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inline pid_t
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wait (int *wstatus)
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{
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return gdb::handle_eintr (-1, ::wait, wstatus);
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}
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inline int
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close (int fd)
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{
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return gdb::handle_eintr (-1, ::close, fd);
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}
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inline ssize_t
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read (int fd, void *buf, size_t count)
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{
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return gdb::handle_eintr (-1, ::read, fd, buf, count);
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}
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template<typename... Args> int fcntl (int fd, int op, Args... args)
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{
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return gdb::handle_eintr (-1, ::fcntl, fd, op, args...);
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}
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inline ssize_t
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write (int fd, const void *buf, size_t count)
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{
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return gdb::handle_eintr (-1, ::write, fd, buf, count);
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}
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} /* namespace gdb */
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#endif /* GDBSUPPORT_EINTR_H */
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