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https://github.com/darlinghq/darling-xnu.git
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94 lines
2.6 KiB
C
94 lines
2.6 KiB
C
/*
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* testname: pwrite_avoid_sigxfsz_28581610
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*/
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#include <darwintest.h>
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#include <fcntl.h>
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#include <limits.h>
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#include <setjmp.h>
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#include <signal.h>
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#include <sys/resource.h>
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#include <sys/stat.h>
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#include <unistd.h>
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T_GLOBAL_META(T_META_RUN_CONCURRENTLY(true));
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#define TMP_FILE_PATH "/tmp/test_pwrite_28581610"
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static sigjmp_buf xfsz_jmpbuf;
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void xfsz_signal(int);
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void
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xfsz_signal(__unused int signo)
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{
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siglongjmp(xfsz_jmpbuf, 1);
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}
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T_DECL(pwrite, "Tests avoiding SIGXFSZ with pwrite and odd offsets",
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T_META_ASROOT(true))
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{
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int fd, x;
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off_t ret;
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struct stat f_stat;
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struct rlimit crl;
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static const int offs[] = { -1, -1 * 1024, -1 * 1024 * 16, -1 * 1024 * 1024 * 16, 0 };
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static unsigned char buffer[1048576];
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T_SETUPBEGIN;
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/* We expect zero SIGXFSZ signals because we have no file size limits */
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crl.rlim_cur = crl.rlim_max = RLIM_INFINITY;
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ret = setrlimit(RLIMIT_FSIZE, &crl);
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T_ASSERT_POSIX_SUCCESS(ret, "setting infinite file size limit");
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/* we just needed root to setup unlimited file size */
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remove(TMP_FILE_PATH);
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setuid(5000);
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/* We just want an empty regular file to test with */
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fd = open(TMP_FILE_PATH, O_RDWR | O_CREAT | O_EXCL, 0777);
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T_ASSERT_POSIX_SUCCESS(fd, "opening fd on temp file %s.", TMP_FILE_PATH);
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/* sanity check that this new file is really zero bytes in size */
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ret = fstat(fd, &f_stat);
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T_ASSERT_POSIX_SUCCESS(ret, "stat() fd on temp file.");
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T_ASSERT_TRUE(0 == f_stat.st_size, "ensure %s is empty", TMP_FILE_PATH);
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/* sanity check that ftruncate() considers negative offsets an error */
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for (x = 0; offs[x] != 0; x++) {
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ret = ftruncate(fd, offs[x]);
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T_ASSERT_TRUE(((ret == -1) && (errno == EINVAL)),
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"negative offset %d", offs[x]);
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}
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T_SETUPEND;
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/* we want to get the EFBIG errno but without a SIGXFSZ signal */
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if (!sigsetjmp(xfsz_jmpbuf, 1)) {
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signal(SIGXFSZ, xfsz_signal);
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ret = pwrite(fd, buffer, sizeof buffer, QUAD_MAX);
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T_ASSERT_TRUE(((ret == -1) && (errno == EFBIG)),
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"large offset %d", 13);
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} else {
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signal(SIGXFSZ, SIG_DFL);
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T_FAIL("%s unexpected SIGXFSZ with offset %lX",
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"<rdar://problem/28581610>", LONG_MAX);
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}
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/* Negative offsets are invalid, no SIGXFSZ signals required */
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for (x = 0; offs[x] != 0; x++) {
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if (!sigsetjmp(xfsz_jmpbuf, 1)) {
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signal(SIGXFSZ, xfsz_signal);
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ret = pwrite(fd, buffer, sizeof buffer, offs[x]);
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T_ASSERT_TRUE(((ret == -1) && (errno == EINVAL)),
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"negative offset %d", offs[x]);
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} else {
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signal(SIGXFSZ, SIG_DFL);
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T_FAIL("%s unexpected SIGXFSZ with negative offset %d",
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"<rdar://problem/28581610>", offs[x]);
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}
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}
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remove(TMP_FILE_PATH);
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}
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