Mercurial > gnulib
view lib/full-write.c @ 17363:5a51fb7777a9
sys_select, sys_time: port 2013-01-30 Solaris 2.6 fix to Cygwin
Problem reported by Marco Atzeri in
<http://lists.gnu.org/archive/html/bug-gnulib/2013-03/msg00000.html>.
* lib/sys_select.in.h [HAVE_SYS_SELECT_H && _CYGWIN_SYS_TIME_H]:
Simply delegate to the system <sys/select.h> in this case too.
Also, pay attention to _GL_SYS_SELECT_H_REDIRECT_FROM_SYS_TIME_H only
if OSF/1, since otherwise Cygwin breaks, and it doesn't seem to
be needed on Solaris either.
* lib/sys_time.in.h [_CYGWIN_SYS_TIME_H]:
Simply delgate to the system <sys/time.h> in this case.
author | Paul Eggert <eggert@cs.ucla.edu> |
---|---|
date | Tue, 19 Mar 2013 09:08:47 -0700 |
parents | e542fd46ad6f |
children | 344018b6e5d7 |
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/* An interface to read and write that retries (if necessary) until complete. Copyright (C) 1993-1994, 1997-2006, 2009-2013 Free Software Foundation, Inc. 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/>. */ #include <config.h> /* Specification. */ #ifdef FULL_READ # include "full-read.h" #else # include "full-write.h" #endif #include <errno.h> #ifdef FULL_READ # include "safe-read.h" # define safe_rw safe_read # define full_rw full_read # undef const # define const /* empty */ #else # include "safe-write.h" # define safe_rw safe_write # define full_rw full_write #endif #ifdef FULL_READ /* Set errno to zero upon EOF. */ # define ZERO_BYTE_TRANSFER_ERRNO 0 #else /* Some buggy drivers return 0 when one tries to write beyond a device's end. (Example: Linux 1.2.13 on /dev/fd0.) Set errno to ENOSPC so they get a sensible diagnostic. */ # define ZERO_BYTE_TRANSFER_ERRNO ENOSPC #endif /* Write(read) COUNT bytes at BUF to(from) descriptor FD, retrying if interrupted or if a partial write(read) occurs. Return the number of bytes transferred. When writing, set errno if fewer than COUNT bytes are written. When reading, if fewer than COUNT bytes are read, you must examine errno to distinguish failure from EOF (errno == 0). */ size_t full_rw (int fd, const void *buf, size_t count) { size_t total = 0; const char *ptr = (const char *) buf; while (count > 0) { size_t n_rw = safe_rw (fd, ptr, count); if (n_rw == (size_t) -1) break; if (n_rw == 0) { errno = ZERO_BYTE_TRANSFER_ERRNO; break; } total += n_rw; ptr += n_rw; count -= n_rw; } return total; }