"he stat system call can access a file by name and retrieve file status information. It is given nt stat (const char *pathname, struct stat *buf); This system c eturns a stat structure (both the function and struct are called stat), which contains ollowing fields: truct stat { ev_t st_dev; /* ID of device containing file */ no_t st_ino; /* inode number */ node_t st_mode; * protection */ link t st nlink; /* number of hard links * id t st uid; * user ID of owner */ id t st gid; /* group ID of owner */ ev_t st_rdev; device ID (if special file) */ ff tst size; * total size, in bytes */ Iksize_t st blksize; *blocksize for file system IO * Ikcnt_t st blocks; * number of 512B blocks allocated */ ime t st_atime; / time of last access */ ime_t st_mtime; / time of last modification */ ime_t st_ctime; /* time of last status change */ On success, zero is returned. On error, -1 is returmed, and errno is set appropriately. ollowing program displays the time that the file path was last accessed. Type in and complete the following program on the computer. Save it printaccess.c. Compile the program, then execute it by giving it a path name as argument. printaccess.c: nelude nelude nclude I main (int arge, char *argv[]) li define an instance of struct stat (don't use a pointer). i Use the stat function store the status of the file in your stat struct Ii stat takes a pointer, so pass your struct by reference with & if( --1) il use perror to print error message then exit program il print the last access time for the file using defined instance of il struct stat. etime requires a pointer, hence the & below. printf ("%s last accessed at %s", argv[1], ctime(& st atime);
"he stat system call can access a file by name and retrieve file status information. It is given nt stat (const char *pathname, struct stat *buf); This system c eturns a stat structure (both the function and struct are called stat), which contains ollowing fields: truct stat { ev_t st_dev; /* ID of device containing file */ no_t st_ino; /* inode number */ node_t st_mode; * protection */ link t st nlink; /* number of hard links * id t st uid; * user ID of owner */ id t st gid; /* group ID of owner */ ev_t st_rdev; device ID (if special file) */ ff tst size; * total size, in bytes */ Iksize_t st blksize; *blocksize for file system IO * Ikcnt_t st blocks; * number of 512B blocks allocated */ ime t st_atime; / time of last access */ ime_t st_mtime; / time of last modification */ ime_t st_ctime; /* time of last status change */ On success, zero is returned. On error, -1 is returmed, and errno is set appropriately. ollowing program displays the time that the file path was last accessed. Type in and complete the following program on the computer. Save it printaccess.c. Compile the program, then execute it by giving it a path name as argument. printaccess.c: nelude nelude nclude I main (int arge, char *argv[]) li define an instance of struct stat (don't use a pointer). i Use the stat function store the status of the file in your stat struct Ii stat takes a pointer, so pass your struct by reference with & if( --1) il use perror to print error message then exit program il print the last access time for the file using defined instance of il struct stat. etime requires a pointer, hence the & below. printf ("%s last accessed at %s", argv[1], ctime(& st atime);
C++ for Engineers and Scientists
4th Edition
ISBN:9781133187844
Author:Bronson, Gary J.
Publisher:Bronson, Gary J.
Chapter8: I/o Streams And Data Files
Section8.5: A Case Study: Pollen Count File Update
Problem 4E
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