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https://github.com/libguestfs/libguestfs.git
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0f54df53d2
As part of our efforts to clean up and simplify libguestfs, removing gnulib deletes a large dependency that we mostly no longer use and causes problems for new users trying to build the library from source. A few modules from gnulib are still used (under a compatible license) and these are copied into gnulib/lib/
45 lines
2.1 KiB
C
45 lines
2.1 KiB
C
/* An interface to write() that retries after interrupts.
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Copyright (C) 2002, 2009-2021 Free Software Foundation, Inc.
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(NB: I modified the original GPL boilerplate here to LGPLv2+. This
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is because of the weird way that gnulib uses licenses, where the
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real license is covered in the modules/X file. The real license
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for this file is LGPLv2+, not GPL. - RWMJ)
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2 of the License, or (at your option) any later version.
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This library 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 GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with this library; if not, write to the Free Software
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Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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/* Some system calls may be interrupted and fail with errno = EINTR in the
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following situations:
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- The process is stopped and restarted (signal SIGSTOP and SIGCONT, user
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types Ctrl-Z) on some platforms: Mac OS X.
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- The process receives a signal for which a signal handler was installed
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with sigaction() with an sa_flags field that does not contain
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SA_RESTART.
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- The process receives a signal for which a signal handler was installed
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with signal() and for which no call to siginterrupt(sig,0) was done,
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on some platforms: AIX, HP-UX, IRIX, OSF/1, Solaris.
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This module provides a wrapper around write() that handles EINTR. */
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#include <stddef.h>
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#define SAFE_WRITE_ERROR ((size_t) -1)
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/* Write up to COUNT bytes at BUF to descriptor FD, retrying if interrupted.
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Return the actual number of bytes written, zero for EOF, or SAFE_WRITE_ERROR
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upon error. */
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extern size_t safe_write (int fd, const void *buf, size_t count);
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