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#include <errno.h>
#include <unistd.h>
#include <signal.h>
#include "ioexact.h"
extern volatile sig_atomic_t sigint;
ssize_t read_exact(int fd, void *buf, size_t len, int mayexit)
{
ssize_t num = 0, written;
while (len > 0 && !sigint) {
if ((written = read(fd, buf, len)) < 0) {
if (errno == EAGAIN && num > 0)
continue;
if (mayexit)
return -1;
else
continue;
}
if (!written)
return 0;
len -= written;
buf += written;
num += written;
}
return num;
}
ssize_t write_exact(int fd, void *buf, size_t len, int mayexit)
{
ssize_t num = 0, written;
while (len > 0 && !sigint) {
if ((written = write(fd, buf, len)) < 0) {
if (errno == EAGAIN && num > 0)
continue;
if (mayexit)
return -1;
else
continue;
}
if (!written)
return 0;
len -= written;
buf += written;
num += written;
}
return num;
}
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