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    <p>The system call</p> <pre><code>int stat(const char *path, struct stat *buf); </code></pre> <p>does not allocate memory for <code>*buf</code>.</p> <p>Either you stay with your declaration </p> <pre><code>struct stat *buf; </code></pre> <p>and allocate the memory by hand with</p> <pre><code>buf = (struct stat *) malloc(sizeof(struct stat)); </code></pre> <p>and free the memory with <code>free</code> at a place where you don't need <code>buf</code> anylonger</p> <p>or you change the declaration to</p> <pre><code>struct stat buf; </code></pre> <p>and let c allocate the memory for you.</p> <p>More over you should test failing of <code>stat</code> with <code>if(stat(t,&amp;buf) &lt; 0)</code> as recommended in the manual.</p> <p>Another error is, that you don't pass the filename to <code>stat</code> but the directory name.</p> <p>I appended a corrected version of your code.</p> <hr> <pre><code>#include&lt;sys/types.h&gt; #include&lt;time.h&gt; #include&lt;string.h&gt; #include&lt;dirent.h&gt; #include&lt;stdio.h&gt; #include&lt;sys/stat.h&gt; #include&lt;unistd.h&gt; void do_ls(char []); void show_file_info(struct stat *t){ printf("mode: %o\n",t-&gt;st_mode); if((t-&gt;st_mode &amp; S_IFMT) == S_IFDIR) printf("Is a dir\n"); else printf("Is not a dir\n"); printf("links: %d\n",t-&gt;st_nlink); printf("group: %d\n",t-&gt;st_gid); printf("user: %d\n",t-&gt;st_uid); printf("size: %d\n",t-&gt;st_size); printf("modtime: %s\n",ctime(&amp;t-&gt;st_mtime)); } int main(int num,char *a[]){ if(num==1){ do_ls("."); } else{ while(--num){ printf("%s :\n",*++a); do_ls(*a); } } } void do_ls(char dirname[]){ DIR *tem=opendir(dirname); struct dirent *direntp; struct stat buf; char t[256]; if(tem==NULL){ fprintf(stderr,"ls: cannot open %s\n",dirname); } else{ while((direntp=readdir(tem))!=NULL){ strcpy(t,dirname); printf("%s\n",direntp-&gt;d_name); strcat(t,"/"); strcat(t,direntp-&gt;d_name); if(stat(t,&amp;buf) &lt; 0){ perror(""); break; } else{ show_file_info(&amp;buf); } } closedir(tem); } } </code></pre>
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    1. POTesting directory suing S_ISDIR,But it doesn't work
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    1. USuser1146332
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    1. COThanks for your answer.But the problem remains to be unsolved. "logout" is a directory, but the program output like this mode: 40755 Is not a dir links: 6 group: 1000 user: 1000 size: 4096 modtime: Fri Feb 1 17:59:53 2013
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    2. COI appended a corrected version. Now everything works fine. In your code you didn't passed the filename to `stat` but always the directory name...
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    3. COdid you compile and run the program?did it give you the right output?
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