101 lines
2.2 KiB
C
101 lines
2.2 KiB
C
|
/* This file is part of the sample code and exercises
|
||
|
* used by the class "Advanced Programming in the UNIX
|
||
|
* Environment" taught by Jan Schaumann
|
||
|
* <jschauma@netmeister.org> at Stevens Institute of
|
||
|
* Technology.
|
||
|
*
|
||
|
* This file is in the public domain.
|
||
|
*
|
||
|
* You don't have to, but if you feel like
|
||
|
* acknowledging where you got this code, you may
|
||
|
* reference me by name, email address, or point
|
||
|
* people to the course website:
|
||
|
* https://stevens.netmeister.org/631/
|
||
|
*/
|
||
|
|
||
|
/*
|
||
|
* Variant of 'simple-ls' that illustrates the
|
||
|
* difference between stat(2) and lstat(2).
|
||
|
*
|
||
|
* Create a few files and symlink to different types
|
||
|
* of files to show.
|
||
|
*/
|
||
|
|
||
|
#include <sys/types.h>
|
||
|
#include <sys/stat.h>
|
||
|
|
||
|
#include <dirent.h>
|
||
|
#include <errno.h>
|
||
|
#include <stdio.h>
|
||
|
#include <stdlib.h>
|
||
|
#include <string.h>
|
||
|
#include <unistd.h>
|
||
|
|
||
|
char *
|
||
|
getType(const struct stat sb) {
|
||
|
if (S_ISREG(sb.st_mode))
|
||
|
return "regular file";
|
||
|
else if (S_ISDIR(sb.st_mode))
|
||
|
return "directory";
|
||
|
else if (S_ISCHR(sb.st_mode))
|
||
|
return "character special";
|
||
|
else if (S_ISBLK(sb.st_mode))
|
||
|
return "block special";
|
||
|
else if (S_ISFIFO(sb.st_mode))
|
||
|
return "FIFO";
|
||
|
else if (S_ISLNK(sb.st_mode))
|
||
|
return "symbolic link";
|
||
|
else if (S_ISSOCK(sb.st_mode))
|
||
|
return "socket";
|
||
|
else
|
||
|
return "unknown";
|
||
|
}
|
||
|
|
||
|
int
|
||
|
main(int argc, char **argv) {
|
||
|
|
||
|
DIR *dp;
|
||
|
struct dirent *dirp;
|
||
|
|
||
|
if (argc != 2) {
|
||
|
fprintf(stderr, "usage: %s dir_name\n", argv[0]);
|
||
|
exit(EXIT_FAILURE);
|
||
|
}
|
||
|
|
||
|
if ((dp = opendir(argv[1])) == NULL) {
|
||
|
fprintf(stderr, "can't open '%s'\n", argv[1]);
|
||
|
exit(EXIT_FAILURE);
|
||
|
}
|
||
|
|
||
|
if (chdir(argv[1]) == -1) {
|
||
|
fprintf(stderr, "can't chdir to '%s': %s\n", argv[1], strerror(errno));
|
||
|
exit(EXIT_FAILURE);
|
||
|
}
|
||
|
|
||
|
while ((dirp = readdir(dp)) != NULL) {
|
||
|
struct stat sb;
|
||
|
char *statType;
|
||
|
|
||
|
printf("%s: ", dirp->d_name);
|
||
|
if (stat(dirp->d_name, &sb) == -1) {
|
||
|
fprintf(stderr, "Can't stat %s: %s\n", dirp->d_name,
|
||
|
strerror(errno));
|
||
|
statType = "unknown";
|
||
|
} else {
|
||
|
statType = getType(sb);
|
||
|
}
|
||
|
|
||
|
if (lstat(dirp->d_name, &sb) == -1) {
|
||
|
fprintf(stderr,"Can't lstat %s: %s\n", dirp->d_name,
|
||
|
strerror(errno));
|
||
|
continue;
|
||
|
} else if (S_ISLNK(sb.st_mode)) {
|
||
|
printf("symlink to ");
|
||
|
}
|
||
|
printf("%s\n", statType);
|
||
|
}
|
||
|
|
||
|
(void)closedir(dp);
|
||
|
return EXIT_SUCCESS;
|
||
|
}
|