71 lines
2 KiB
C++
71 lines
2 KiB
C++
/* Utility for handling interrupted syscalls by signals.
|
|
|
|
Copyright (C) 2020-2022 Free Software Foundation, Inc.
|
|
|
|
This file is part of GDB.
|
|
|
|
This program is free software; you can redistribute it and/or modify
|
|
it under the terms of the GNU General Public License as published by
|
|
the Free Software Foundation; either version 3 of the License, or
|
|
(at your option) any later version.
|
|
|
|
This program is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
GNU General Public License for more details.
|
|
|
|
You should have received a copy of the GNU General Public License
|
|
along with this program. If not, see <http://www.gnu.org/licenses/>. */
|
|
|
|
#ifndef GDBSUPPORT_EINTR_H
|
|
#define GDBSUPPORT_EINTR_H
|
|
|
|
#include <cerrno>
|
|
|
|
namespace gdb
|
|
{
|
|
/* Repeat a system call interrupted with a signal.
|
|
|
|
A utility for handling interrupted syscalls, which return with error
|
|
and set the errno to EINTR. The interrupted syscalls can be repeated,
|
|
until successful completion. This utility avoids wrapping code with
|
|
manual checks for such errors which are highly repetitive.
|
|
|
|
For example, with:
|
|
|
|
ssize_t ret;
|
|
do
|
|
{
|
|
errno = 0;
|
|
ret = ::write (pipe[1], "+", 1);
|
|
}
|
|
while (ret == -1 && errno == EINTR);
|
|
|
|
You could wrap it by writing the wrapped form:
|
|
|
|
ssize_t ret = gdb::handle_eintr (-1, ::write, pipe[1], "+", 1);
|
|
|
|
ERRVAL specifies the failure value indicating that the call to the
|
|
F function with ARGS... arguments was possibly interrupted with a
|
|
signal. */
|
|
|
|
template<typename ErrorValType, typename Fun, typename... Args>
|
|
inline auto
|
|
handle_eintr (ErrorValType errval, const Fun &f, const Args &... args)
|
|
-> decltype (f (args...))
|
|
{
|
|
decltype (f (args...)) ret;
|
|
|
|
do
|
|
{
|
|
errno = 0;
|
|
ret = f (args...);
|
|
}
|
|
while (ret == errval && errno == EINTR);
|
|
|
|
return ret;
|
|
}
|
|
|
|
} /* namespace gdb */
|
|
|
|
#endif /* GDBSUPPORT_EINTR_H */
|