Linux C 获取 文件的大小

通过Linux C库函数来获取文件的大小

#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <malloc.h>
#include <stdio.h>

void main(int argc, char*argv[]){

	off_t file_size;
	char *buffer;
	struct stat stbuf;
	int fd;

	fd = open(argv[1], O_RDONLY);
	if (fd == -1) {
	  /* Handle error */
	}

	if ((fstat(fd, &stbuf) != 0) || (!S_ISREG(stbuf.st_mode))) {
	  /* Handle error */
	}

	file_size = stbuf.st_size;
	printf("file_size is %d\n", file_size);
}

其中，struct stat的结构如下：

struct stat {
    dev_t     st_dev;     /* ID of device containing file */
    ino_t     st_ino;     /* inode number */
    mode_t    st_mode;    /* protection */
    nlink_t   st_nlink;   /* number of hard links */
    uid_t     st_uid;     /* user ID of owner */
    gid_t     st_gid;     /* group ID of owner */
    dev_t     st_rdev;    /* device ID (if special file) */
    off_t     st_size;    /* total size, in bytes */
    blksize_t st_blksize; /* blocksize for file system I/O */
    blkcnt_t  st_blocks;  /* number of 512B blocks allocated */
    time_t    st_atime;   /* time of last access */
    time_t    st_mtime;   /* time of last modification */
    time_t    st_ctime;   /* time of last status change */
};