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