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fs/vfs: Add new internal OS interface nx_read(). nx_read() is functionally equivalent to read() except that it does not modify the errno variable and it is not a cancellation point. Changed all references to read() in the OS to nx_read().

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This commit is contained in:
Gregory Nutt
2017-10-11 12:13:41 -06:00
parent 957831d2ba
commit 181875f3ba
18 changed files with 222 additions and 141 deletions
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binfmt/pcode.c
+7 -9
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@@ -49,6 +49,7 @@
#include <nuttx/kmalloc.h>
#include <nuttx/poff.h>
#include <nuttx/fd/fs.h>
#include <nuttx/drivers/ramdisk.h>
#include <nuttx/binfmt/binfmt.h>
#include <nuttx/binfmt/pcode.h>
@@ -404,20 +405,17 @@ static int pcode_load(struct binary_s *binp)
{
/* Read the next GULP */
nread = read(fd, ptr, remaining);
nread = nx_read(fd, ptr, remaining);
if (nread < 0)
{
/* If errno is EINTR, then this is not an error; the read() was
* simply interrupted by a signal.
/* If the failure is EINTR, then this is not an error; the
* nx_read() was simply interrupted by a signal.
*/
int errval = get_errno();
DEBUGASSERT(errval > 0);
if (errval != EINTR)
if (nread != -EINTR)
{
berr("ERROR: read failed: %d\n", errval);
ret = -errval;
berr("ERROR: read failed: %d\n", (int)nread);
ret = nread;
goto errout_with_fd;
}