1. 进程虚拟地址空间
2. stat函数
- 获取文件信息
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h> int stat(const char *pathname, struct stat *statbuf);
int fstat(int fd, struct stat *statbuf);
int lstat(const char *pathname, struct stat *statbuf); #include <fcntl.h> /* Definition of AT_* constants */
#include <sys/stat.h> int fstatat(int dirfd, const char *pathname, struct stat *statbuf,
int flags);
struct stat {
dev_t st_dev; /* ID of device containing file */
ino_t st_ino; /* Inode number */
mode_t st_mode; /* File type and mode */
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; /* Block size for filesystem I/O */
blkcnt_t st_blocks; /* Number of 512B blocks allocated */
/* Since Linux 2.6, the kernel supports nanosecond
precision for the following timestamp fields.
For the details before Linux 2.6, see NOTES. */
struct timespec st_atim; /* Time of last access */
struct timespec st_mtim; /* Time of last modification */
struct timespec st_ctim; /* Time of last status change */
#define st_atime st_atim.tv_sec /* Backward compatibility */
#define st_mtime st_mtim.tv_sec
#define st_ctime st_ctim.tv_sec
};stat函数参数
- pathname 文件名
- struct stat *buf 传出参数，定义 struct stat sb; &sb
返回值
- 成功返回0，失败返回-1，设置errno
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include <stdio.h> int main(int argc, char *argv[])
{
if (argc != ) {
printf("./a.out filename\n");
return -;
}
struct stat sb;
stat(argv[], &sb); return ; }