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POHow do I check if a file is executable using ANSI C?
 

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  1. POHow do I check if a file is executable using ANSI C?
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    <p>I'm trying to write a program that checks files in a directory. When a new file is created I have to check if it executable and if so I have to execute it.</p> <p>I'm using the inotify interface and it works well, but I have some problems when I try to check whether a file is executable using stat(2). I found that I don't have permission to execute it.</p> <p>Does passing to the program an absolute path of the directory that I want to check create permissions problems?</p> <pre><code>int main(int argc,char * argv []){ int fd,wd,len,i=0; char buffer [EVENT_SIZE_BUF]; if(argc != 2) usage(); if((fd = inotify_init()) == -1) perror("inotify_init()"); if((wd = inotify_add_watch(fd,argv[1],IN_CREATE) -1)) perror("inotify_add_watch()"); while(1){ if((len = read(fd,buffer,EVENT_SIZE_BUF)) &lt; 0) perror("read()"); struct inotify_event * ev = (struct inotify_event *)&amp;buffer; if(ev-&gt;len &gt; 0){ if(ev-&gt;mask &amp; IN_CREATE &amp;&amp; ((ev-&gt; mask &amp; IN_ISDIR) == 0x00)){ printf("SPY; new file is created %s\n",ev-&gt;name); char * path = strcat(argv[1],ev-&gt;name); printf("%s\n",path); struct stat sb; if(!stat(path,&amp;sb)){ printf( (S_ISDIR(sb.st_mode)) ? "d" : "-"); printf( (sb.st_mode &amp; S_IRUSR) ? "r" : "-"); printf( (sb.st_mode &amp; S_IWUSR) ? "w" : "-"); printf( (sb.st_mode &amp; S_IXUSR) ? "x" : "-"); printf( (sb.st_mode &amp; S_IRGRP) ? "r" : "-"); printf( (sb.st_mode &amp; S_IWGRP) ? "w" : "-"); printf( (sb.st_mode &amp; S_IXGRP) ? "x" : "-"); printf( (sb.st_mode &amp; S_IROTH) ? "r" : "-"); printf( (sb.st_mode &amp; S_IWOTH) ? "w" : "-"); printf( (sb.st_mode &amp; S_IXOTH) ? "x" : "-"); fflush(stdout); printf("\n"); } }else{ printf("dir\n"); } } } inotify_rm_watch(fd,wd); close(fd); return 0; } </code></pre>
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      1. POHow do I check if a file is executable using ANSI C?
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    1. COI've edited the question to try to make it a bit clearer. Feel free to roll-back/edit it if I've made incorrect changes/forgotten something.
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