1 #include <stdio.h>
2 #include <stdlib.h>
3 #include <string.h>
4
5 #include <unistd.h>
6 #include <fcntl.h>
7 #include <errno.h>
8
9
10 #define BUFFER_SIZE 4096
11 char buffer[BUFFER_SIZE];
12
13 #define CPUINFO_PATH "/proc/cpuinfo"
14
main(int argc,char ** argv)15 int main(int argc, char** argv) {
16 int file = open(CPUINFO_PATH, O_RDONLY);
17 if (file == -1) {
18 fprintf(stderr, "Error: failed to open %s: %s\n", CPUINFO_PATH, strerror(errno));
19 exit(EXIT_FAILURE);
20 }
21
22 /* Only used for error reporting */
23 size_t position = 0;
24 char* data_start = buffer;
25 ssize_t bytes_read;
26 do {
27 bytes_read = read(file, buffer, BUFFER_SIZE);
28 if (bytes_read < 0) {
29 fprintf(stderr, "Error: failed to read file %s at position %zu: %s\n",
30 CPUINFO_PATH, position, strerror(errno));
31 exit(EXIT_FAILURE);
32 }
33
34 position += (size_t) bytes_read;
35 if (bytes_read > 0) {
36 fwrite(buffer, 1, (size_t) bytes_read, stdout);
37 }
38 } while (bytes_read != 0);
39
40 if (close(file) != 0) {
41 fprintf(stderr, "Error: failed to close %s: %s\n", CPUINFO_PATH, strerror(errno));
42 exit(EXIT_FAILURE);
43 }
44 return EXIT_SUCCESS;
45 }
46