This source file includes following definitions.
- ion
- readn
- writen
1
2 #include <unistd.h>
3 #include <stdbool.h>
4 #include <errno.h>
5 #include <linux/kernel.h>
6 #include <internal/lib.h>
7
8 unsigned int page_size;
9
10 static ssize_t ion(bool is_read, int fd, void *buf, size_t n)
11 {
12 void *buf_start = buf;
13 size_t left = n;
14
15 while (left) {
16
17 ssize_t ret = is_read ? read(fd, buf, left) :
18 write(fd, buf, left);
19
20 if (ret < 0 && errno == EINTR)
21 continue;
22 if (ret <= 0)
23 return ret;
24
25 left -= ret;
26 buf += ret;
27 }
28
29 BUG_ON((size_t)(buf - buf_start) != n);
30 return n;
31 }
32
33
34
35
36 ssize_t readn(int fd, void *buf, size_t n)
37 {
38 return ion(true, fd, buf, n);
39 }
40
41
42
43
44 ssize_t writen(int fd, const void *buf, size_t n)
45 {
46
47 return ion(false, fd, (void *)buf, n);
48 }