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/*
* Looping versions of pread() and pwrite()
*/
#include <stdlib.h>
#include <unistd.h>
#include <errno.h>
#include "xpio.h"
ssize_t xpread(int fd, void *buf, size_t count, off_t offset)
{
ssize_t ctr = 0;
ssize_t rv = 0;
char *bp = buf;
while (count) {
rv = pread(fd, bp, count, offset);
if (rv == 0 || (rv == -1 && errno != EINTR))
break;
bp += rv;
count -= rv;
offset += rv;
ctr += rv;
}
return ctr ? ctr : rv;
}
ssize_t xpwrite(int fd, void *buf, size_t count, off_t offset)
{
ssize_t ctr = 0;
ssize_t rv = 0;
char *bp = buf;
while (count) {
rv = pwrite(fd, bp, count, offset);
if (rv == 0 || (rv == -1 && errno != EINTR))
break;
bp += rv;
count -= rv;
offset += rv;
ctr += rv;
}
return ctr ? ctr : rv;
}
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