76 lines
1.7 KiB
C
76 lines
1.7 KiB
C
#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <string.h>
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#include <stdio.h>
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int main(int argc, const char* argv[]) {
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const char* FILE_NAME = "tmp.txt";
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const int TRUNC_LEN = 256;
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const int TRUNC_LEN1 = 128;
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const int MODE_MASK = 0777;
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int ret;
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int flags = O_WRONLY | O_CREAT| O_TRUNC;
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int mode = 00666;
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int fd = open(FILE_NAME, flags, mode);
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if (fd < 0) {
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printf("failed to open a file for write\n");
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return fd;
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}
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ret = ftruncate(fd, TRUNC_LEN);
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if (ret < 0) {
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printf("failed to ftruncate the file\n");
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return ret;
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}
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struct stat stat_buf;
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ret = fstat(fd, &stat_buf);
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if (ret < 0) {
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printf("failed to fstat the file\n");
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return ret;
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}
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int file_size = stat_buf.st_size;
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if (file_size != TRUNC_LEN) {
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printf("Incorrect file size %d. Expected %d\n", file_size, TRUNC_LEN);
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return -1;
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}
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int file_mode = stat_buf.st_mode & MODE_MASK;
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if (file_mode != mode) {
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printf("Incorrect file mode %o. Expected %o\n", file_mode, mode);
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return -1;
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}
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int file_type = stat_buf.st_mode & S_IFMT;
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if (file_type != S_IFREG) {
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printf("Incorrect file type %o. Expected %o\n", file_type, S_IFREG);
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return -1;
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}
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close(fd);
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ret = truncate(FILE_NAME, TRUNC_LEN1);
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if (ret < 0) {
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printf("failed to truncate the file\n");
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return ret;
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}
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ret = stat(FILE_NAME, &stat_buf);
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if (ret < 0) {
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printf("failed to stat the file\n");
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return ret;
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}
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file_size = stat_buf.st_size;
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if (file_size != TRUNC_LEN1) {
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printf("Incorrect file size %d. Expected %d\n", file_size, TRUNC_LEN1);
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return -1;
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}
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printf("(f)truncate, (f)stat test successful\n");
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return 0;
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}
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