From patchwork Thu Dec 31 01:33:11 2009 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Subject: [01/14] Introduce qemu_write_full() X-Patchwork-Submitter: "Kirill A. Shutemov" X-Patchwork-Id: 41946 Message-Id: <1262223199-19062-1-git-send-email-kirill@shutemov.name> To: qemu-devel@nongnu.org Cc: "Kirill A. Shutemov" Date: Thu, 31 Dec 2009 03:33:11 +0200 From: "Kirill A. Shutemov" List-Id: qemu-devel.nongnu.org A variant of write(2) which handles partial write. Signed-off-by: Kirill A. Shutemov --- osdep.c | 27 +++++++++++++++++++++++++++ qemu-common.h | 1 + 2 files changed, 28 insertions(+), 0 deletions(-) diff --git a/osdep.c b/osdep.c index e4836e7..d2406f2 100644 --- a/osdep.c +++ b/osdep.c @@ -243,6 +243,33 @@ int qemu_open(const char *name, int flags, ...) return ret; } +/* + * A variant of write(2) which handles partial write. + * + * Return the number of bytes transferred. + * Set errno if fewer than `count' bytes are written. + */ +ssize_t qemu_write_full(int fd, const void *buf, size_t count) +{ + ssize_t ret = 0; + ssize_t total = 0; + + while (count) { + ret = write(fd, buf, count); + if (ret < 0) { + if (errno == EINTR) + continue; + break; + } + + count -= ret; + buf += ret; + total += ret; + } + + return total; +} + #ifndef _WIN32 /* * Creates a pipe with FD_CLOEXEC set on both file descriptors diff --git a/qemu-common.h b/qemu-common.h index 8630f8c..a8144cb 100644 --- a/qemu-common.h +++ b/qemu-common.h @@ -160,6 +160,7 @@ void qemu_mutex_lock_iothread(void); void qemu_mutex_unlock_iothread(void); int qemu_open(const char *name, int flags, ...); +ssize_t qemu_write_full(int fd, const void *buf, size_t count); void qemu_set_cloexec(int fd); #ifndef _WIN32