1 #include <stdio.h>
2 #include <unistd.h>
3 #include <spawn.h>
4 #include <spawn_private.h>
5 #include <sys/sysctl.h>
6
7 extern char **environ;
8
9 #ifndef _POSIX_SPAWN_FORCE_4K_PAGES
10 #define _POSIX_SPAWN_FORCE_4K_PAGES 0x1000
11 #endif /* _POSIX_SPAWN_FORCE_4K_PAGES */
12
13 int
main(int argc,char * argv[])14 main(int argc, char *argv[])
15 {
16 if (argc < 2) {
17 fprintf(stderr, "Usage: %s </path/to/command> [<arg> ..]\n", argv[0]);
18 return 1;
19 }
20
21 char * prog_path = argv[1];
22 if (0 != access(prog_path, X_OK)) {
23 fprintf(stderr, "%s is not an executable\n", prog_path);
24 return 1;
25 }
26
27 pid_t newpid = 0;
28 posix_spawn_file_actions_t fileactions;
29 posix_spawnattr_t spawnattrs;
30 if (posix_spawnattr_init(&spawnattrs)) {
31 perror("posix_spawnattr_init");
32 return 1;
33 }
34 if (posix_spawn_file_actions_init(&fileactions)) {
35 perror("posix_spawn_file_actions_init");
36 return 1;
37 }
38 short sp_flags = POSIX_SPAWN_SETEXEC;
39
40 /* Need to set special flags */
41 int supported = 0;
42 size_t supported_size = sizeof(supported);
43
44 int r = sysctlbyname("debug.vm_mixed_pagesize_supported", &supported, &supported_size, NULL, 0);
45 if (r == 0 && supported) {
46 sp_flags |= _POSIX_SPAWN_FORCE_4K_PAGES;
47 } else {
48 /*
49 * We didnt find debug.vm.mixed_page.supported OR its set to 0.
50 * Skip the test.
51 */
52 printf("Hardware doesn't support 4K pages, skipping test...");
53 return 0;
54 }
55
56 posix_spawnattr_setflags(&spawnattrs, sp_flags);
57 posix_spawn(&newpid, prog_path, &fileactions, &spawnattrs, &argv[1], environ);
58
59 /* Should not have reached here */
60 fprintf(stderr, "should not have reached here");
61 return 1;
62 }
63