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documentation: qemu_write_full don't work with non-blocking fd's

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Signed-off-by: Juan Quintela <quintela@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
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Juan Quintela 2010-03-04 10:00:39 +01:00 • committed by Anthony Liguori
parent 3e7896dec4
commit 1298cb6804
1 changed files with 5 additions and 0 deletions
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5
osdep.c
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@ -261,6 +261,11 @@ int qemu_open(const char *name, int flags, ...)
* *
* Return the number of bytes transferred. * Return the number of bytes transferred.
* Set errno if fewer than `count' bytes are written. * Set errno if fewer than `count' bytes are written.
*
* This function don't work with non-blocking fd's.
* Any of the possibilities with non-bloking fd's is bad:
* - return a short write (then name is wrong)
* - busy wait adding (errno == EAGAIN) to the loop
*/ */
ssize_t qemu_write_full(int fd, const void *buf, size_t count) ssize_t qemu_write_full(int fd, const void *buf, size_t count)
{ {