1 /*
2 * testname: pwrite_avoid_sigxfsz_28581610
3 */
4
5 #include <darwintest.h>
6 #include <fcntl.h>
7 #include <limits.h>
8 #include <setjmp.h>
9 #include <signal.h>
10 #include <sys/resource.h>
11 #include <sys/stat.h>
12 #include <unistd.h>
13
14 T_GLOBAL_META(T_META_RUN_CONCURRENTLY(true));
15
16 #define TMP_FILE_PATH "/tmp/test_pwrite_28581610"
17
18 static sigjmp_buf xfsz_jmpbuf;
19
20 void xfsz_signal(int);
21
22 void
xfsz_signal(__unused int signo)23 xfsz_signal(__unused int signo)
24 {
25 siglongjmp(xfsz_jmpbuf, 1);
26 }
27
28 T_DECL(pwrite, "Tests avoiding SIGXFSZ with pwrite and odd offsets",
29 T_META_ASROOT(true))
30 {
31 int fd, x;
32 off_t ret;
33 struct stat f_stat;
34 struct rlimit crl;
35 static const int offs[] = { -1, -1 * 1024, -1 * 1024 * 16, -1 * 1024 * 1024 * 16, 0 };
36 static unsigned char buffer[1048576];
37
38 T_SETUPBEGIN;
39 /* We expect zero SIGXFSZ signals because we have no file size limits */
40 crl.rlim_cur = crl.rlim_max = RLIM_INFINITY;
41 ret = setrlimit(RLIMIT_FSIZE, &crl);
42 T_ASSERT_POSIX_SUCCESS(ret, "setting infinite file size limit");
43
44 /* we just needed root to setup unlimited file size */
45 remove(TMP_FILE_PATH);
46 setuid(5000);
47
48 /* We just want an empty regular file to test with */
49 fd = open(TMP_FILE_PATH, O_RDWR | O_CREAT | O_EXCL, 0777);
50 T_ASSERT_POSIX_SUCCESS(fd, "opening fd on temp file %s.", TMP_FILE_PATH);
51
52 /* sanity check that this new file is really zero bytes in size */
53 ret = fstat(fd, &f_stat);
54 T_ASSERT_POSIX_SUCCESS(ret, "stat() fd on temp file.");
55 T_ASSERT_TRUE(0 == f_stat.st_size, "ensure %s is empty", TMP_FILE_PATH);
56
57 /* sanity check that ftruncate() considers negative offsets an error */
58 for (x = 0; offs[x] != 0; x++) {
59 ret = ftruncate(fd, offs[x]);
60 T_ASSERT_TRUE(((ret == -1) && (errno == EINVAL)),
61 "negative offset %d", offs[x]);
62 }
63
64 T_SETUPEND;
65
66 /* we want to get the EFBIG errno but without a SIGXFSZ signal */
67 if (!sigsetjmp(xfsz_jmpbuf, 1)) {
68 signal(SIGXFSZ, xfsz_signal);
69 ret = pwrite(fd, buffer, sizeof buffer, QUAD_MAX);
70 T_ASSERT_TRUE(((ret == -1) && (errno == EFBIG)),
71 "large offset %d", 13);
72 } else {
73 signal(SIGXFSZ, SIG_DFL);
74 T_FAIL("%s unexpected SIGXFSZ with offset %lX",
75 "<rdar://problem/28581610>", LONG_MAX);
76 }
77
78 /* Negative offsets are invalid, no SIGXFSZ signals required */
79 for (x = 0; offs[x] != 0; x++) {
80 if (!sigsetjmp(xfsz_jmpbuf, 1)) {
81 signal(SIGXFSZ, xfsz_signal);
82 ret = pwrite(fd, buffer, sizeof buffer, offs[x]);
83 T_ASSERT_TRUE(((ret == -1) && (errno == EINVAL)),
84 "negative offset %d", offs[x]);
85 } else {
86 signal(SIGXFSZ, SIG_DFL);
87 T_FAIL("%s unexpected SIGXFSZ with negative offset %d",
88 "<rdar://problem/28581610>", offs[x]);
89 }
90 }
91
92 remove(TMP_FILE_PATH);
93 }
94