From 7b5f699dbdf64cf9657e2955bccccc173d9b09fc Mon Sep 17 00:00:00 2001 From: "Kirill A. Shutemov" Date: Wed, 20 Jan 2010 00:56:08 +0100 Subject: Introduce qemu_write_full() 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 --- osdep.c | 27 +++++++++++++++++++++++++++ qemu-common.h | 1 + 2 files changed, 28 insertions(+) diff --git a/osdep.c b/osdep.c index 1310684e3c..09fbc992e3 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 d96060adbf..a2731e1514 100644 --- a/qemu-common.h +++ b/qemu-common.h @@ -161,6 +161,7 @@ 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 -- cgit v1.2.3