diff options
Diffstat (limited to 'lib/dpkg/fdio.c')
-rw-r--r-- | lib/dpkg/fdio.c | 77 |
1 files changed, 77 insertions, 0 deletions
diff --git a/lib/dpkg/fdio.c b/lib/dpkg/fdio.c new file mode 100644 index 0000000..a3f46a3 --- /dev/null +++ b/lib/dpkg/fdio.c @@ -0,0 +1,77 @@ +/* + * 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; +} |