On Mon, 5 Sep 2011, M. Mohan Kumar wrote:
> Signed-off-by: M. Mohan Kumar <mo...@in.ibm.com>
> ---
> osdep.c | 32 ++++++++++++++++++++++++++++++++
> qemu-common.h | 2 ++
> 2 files changed, 34 insertions(+), 0 deletions(-)
>
> diff --git a/osdep.c b/osdep.c
> index 56e6963..5a4d670 100644
> --- a/osdep.c
> +++ b/osdep.c
> @@ -126,6 +126,38 @@ ssize_t qemu_write_full(int fd, const void *buf, size_t
> count)
> }
>
> /*
> + * A variant of read(2) which handles interrupted read.
> + * Simlar to qemu_write_full function
> + *
> + * Return the number of bytes read.
> + *
> + * This function does not work with non-blocking fd's.
> + * errno is set if fewer than `count' bytes are read because of any
> + * error
> + */
> +ssize_t qemu_read_full(int fd, void *buf, size_t count)
> +{
> + ssize_t ret = 0;
> + ssize_t total = 0;
> +
> + while (count) {
> + ret = read(fd, buf, count);
> + if (ret <= 0) {
> + if (errno == EINTR) {
ret == 0 is not an error so here the stale value of errno is checked,
iow this is wrong and recipe for an endless loop.
> + continue;
> + }
> + break;
> + }
> +
> + count -= ret;
> + buf += ret;
> + total += ret;
> + }
> +
> + return total;
> +}
> +
> +/*
> * Opens a socket with FD_CLOEXEC set
> */
> int qemu_socket(int domain, int type, int protocol)
> diff --git a/qemu-common.h b/qemu-common.h
> index 404c421..d6aabd2 100644
> --- a/qemu-common.h
> +++ b/qemu-common.h
> @@ -189,6 +189,8 @@ 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)
> QEMU_WARN_UNUSED_RESULT;
> +ssize_t qemu_read_full(int fd, void *buf, size_t count)
> + QEMU_WARN_UNUSED_RESULT;
> void qemu_set_cloexec(int fd);
>
> #ifndef _WIN32
>
--
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