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/* Read LEN bytes at PTR from descriptor DESC, retrying if necessary.
Return the actual number of bytes read, zero for EOF, or negative
for an error. */
int
safe_read (desc, ptr, len)
int desc;
char *ptr;
int len;
{
int n_remaining;
n_remaining = len;
while (n_remaining > 0)
{
int n_chars = read (desc, ptr, n_remaining);
if (n_chars < 0)
{
#ifdef EINTR
if (errno == EINTR)
continue;
#endif
return n_chars;
}
if (n_chars == 0)
break;
ptr += n_chars;
n_remaining -= n_chars;
}
return len - n_remaining;
}
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