| /* |
| * libdpkg - Debian packaging suite library routines |
| * fdio.c - safe file descriptor based input/output |
| * |
| * Copyright © 2009-2010 Guillem Jover <guillem@debian.org> |
| * |
| * This 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 2 of the License, or |
| * (at your option) any later version. |
| * |
| * This 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> |
| #include <compat.h> |
| |
| #include <errno.h> |
| #include <unistd.h> |
| |
| #include <dpkg/fdio.h> |
| |
| ssize_t |
| fd_read(int fd, void *buf, size_t len) |
| { |
| ssize_t total = 0; |
| char *ptr = buf; |
| |
| while (len > 0) { |
| ssize_t n; |
| |
| n = read(fd, ptr + total, len); |
| if (n == -1) { |
| if (errno == EINTR || errno == EAGAIN) |
| continue; |
| return total ? -total : n; |
| } |
| if (n == 0) |
| break; |
| |
| total += n; |
| len -= n; |
| } |
| |
| return total; |
| } |
| |
| ssize_t |
| fd_write(int fd, const void *buf, size_t len) |
| { |
| ssize_t total = 0; |
| const char *ptr = buf; |
| |
| while (len > 0) { |
| ssize_t n; |
| |
| n = write(fd, ptr + total, len); |
| if (n == -1) { |
| if (errno == EINTR || errno == EAGAIN) |
| continue; |
| return total ? -total : n; |
| } |
| if (n == 0) |
| break; |
| |
| total += n; |
| len -= n; |
| } |
| |
| return total; |
| } |