#include <stdio.h>#include <sys/stat.h> //stat头文件#include <fcntl.h> //open头文件#include <unistd.h> //close头文件/*************************************************************************struct stat { dev_t st_dev; //文件的设备编号 ino_t st_ino; //节点 mode_t st_mode; //文件的类型和存取的权限 nlink_t st_nlink; //连到该文件的硬连接数目，刚建立的文件值为1 uid_t st_uid; //用户ID gid_t st_gid; //组ID dev_t st_rdev; //(设备类型)若此文件为设备文件，则为其设备编号 off_t st_size; //文件字节数(文件大小) unsigned long st_blksize; //块大小(文件系统的I/O 缓冲区大小) unsigned long st_blocks; //块数 time_t st_atime; //最后一次访问时间 time_t st_mtime; //最后一次修改时间 time_t st_ctime; //最后一次改变时间(指属性)};*************************************************************************///dd if=/dev/zero of=test_50Byte.bin count=1 bs=50void test_fstat(void){int fd = 0;struct stat fstatbuf = {0};fd = open("test_50Byte.bin", O_RDWR);if (fstat(fd, &fstatbuf) < 0) {perror("fstat input file");}printf("[fstat]test_50Byte.bin file size = [%ld] Bytenn", fstatbuf.st_size);close(fd);}int main() {int rval = 0;struct stat statbuf = {0};if (stat("test_50Byte.bin", &statbuf) < 0) {perror("stat input file");rval = -1;return rval;}printf("[stat]test_50Byte.bin file size = [%ld] Bytenn", statbuf.st_size);/*************************************************************************/test_fstat();/*************************************************************************/FILE *in = NULL;int file_size = 0;do {in = fopen("test_50Byte.bin", "rb");if (in == NULL) {perror("test_50Byte.bin");rval = -1;break;}if (fseek(in, 0, SEEK_END) < 0) {perror("fseek input file");rval = -1;break;}file_size = ftell(in);printf("[fseek]test_50Byte.bin file size = [%d] Bytenn", file_size);if (fseek(in, 0, SEEK_SET) < 0) {perror("fseek input file");rval = -1;break;}} while (0);if (in) {fclose(in);in = NULL;}return rval;}
打印
[stat]test_50Byte.bin file size = [50] Byte[fstat]test_50Byte.bin file size = [50] Byte[fseek]test_50Byte.bin file size = [50] Byte