96 строки
2.4 KiB
C
96 строки
2.4 KiB
C
#include <assert.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <signal.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <sys/stat.h>
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char nonexistent_name[] = "noexist-##";
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void create_file(const char *path, const char *buffer, int mode) {
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int fd = open(path, O_WRONLY | O_CREAT | O_EXCL, mode);
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assert(fd >= 0);
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int err = write(fd, buffer, sizeof(char) * strlen(buffer));
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assert(err == (sizeof(char) * strlen(buffer)));
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close(fd);
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}
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void setup() {
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create_file("test-file", "abcdef", 0777);
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mkdir("test-folder", 0777);
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}
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void cleanup() {
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unlink("test-file");
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rmdir("test-folder");
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for (int i = 0; i < 3; i++) {
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for (int j = 0; j < 16; j++) {
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nonexistent_name[8] = 'a' + i;
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nonexistent_name[9] = 'a' + j;
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unlink(nonexistent_name);
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}
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}
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unlink("creat-me");
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}
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void test() {
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struct stat s;
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int modes[] = {O_RDONLY, O_WRONLY, O_RDWR};
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for (int i = 0; i < 3; i++) {
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for (int j = 0; j < 16; j++) {
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int flags = modes[i];
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if (j & 0x1) flags |= O_CREAT;
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if (j & 0x2) flags |= O_EXCL;
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if (j & 0x4) flags |= O_TRUNC;
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if (j & 0x8) flags |= O_APPEND;
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printf("EXISTING FILE %d,%d\n", i, j);
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printf("success: %d\n", open("test-file", flags, 0777) != -1);
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printf("errno: %d\n", errno);
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stat("test-file", &s);
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printf("st_mode: 0%o\n", s.st_mode & 037777777000);
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memset(&s, 0, sizeof s);
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printf("\n");
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errno = 0;
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printf("EXISTING FOLDER %d,%d\n", i, j);
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printf("success: %d\n", open("test-folder", flags, 0777) != -1);
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printf("errno: %d\n", errno);
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stat("test-folder", &s);
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printf("st_mode: 0%o\n", s.st_mode & 037777777000);
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memset(&s, 0, sizeof s);
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printf("\n");
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errno = 0;
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nonexistent_name[8] = 'a' + i;
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nonexistent_name[9] = 'a' + j;
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printf("NON-EXISTING %d,%d\n", i, j);
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printf("success: %d\n", open(nonexistent_name, flags, 0777) != -1);
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printf("errno: %d\n", errno);
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stat(nonexistent_name, &s);
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printf("st_mode: 0%o\n", s.st_mode & 037777777000);
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memset(&s, 0, sizeof s);
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printf("\n");
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errno = 0;
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}
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}
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printf("CREAT\n");
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printf("success: %d\n", creat("creat-me", 0777) != -1);
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printf("errno: %d\n", errno);
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}
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int main() {
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atexit(cleanup);
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signal(SIGABRT, cleanup);
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setup();
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test();
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return EXIT_SUCCESS;
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}
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