From b655d35f22350a82a76e5b73be99f165f10b302a Mon Sep 17 00:00:00 2001 From: Juan Quintela Date: Thu, 4 Mar 2010 23:11:29 -0300 Subject: [PATCH 07/42] Introduce qemu_write_full() RH-Author: Juan Quintela Message-id: <85ce3b75609518229affc9c9e3a7b8fca1e64d18.1267743950.git.quintela@redhat.com> Patchwork-id: 7539 O-Subject: [PATCH 07/32] Introduce qemu_write_full() Bugzilla: 567099 RH-Acked-by: Kevin Wolf RH-Acked-by: Amit Shah RH-Acked-by: Marcelo Tosatti From: Kirill A. Shutemov A variant of write(2) which handles partial write. Signed-off-by: Kirill A. Shutemov Signed-off-by: Juan Quintela Signed-off-by: Anthony Liguori (cherry picked from commit 7b5f699dbdf64cf9657e2955bccccc173d9b09fc) Signed-off-by: Juan Quintela --- osdep.c | 27 +++++++++++++++++++++++++++ qemu-common.h | 1 + 2 files changed, 28 insertions(+), 0 deletions(-) Signed-off-by: Eduardo Habkost --- osdep.c | 27 +++++++++++++++++++++++++++ qemu-common.h | 1 + 2 files changed, 28 insertions(+), 0 deletions(-) diff --git a/osdep.c b/osdep.c index d8efd0e..04c9d1d 100644 --- a/osdep.c +++ b/osdep.c @@ -256,6 +256,33 @@ 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 b604ddf..6519ff6 100644 --- a/qemu-common.h +++ b/qemu-common.h @@ -165,6 +165,7 @@ 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 -- 1.6.3.rc4.29.g8146