c - execvp - ls: fts_open: No such file or directory -

i'm struggling error. i'm writing shell emulator, using fork() executing command using execvp();. every command try parse shell working perfectly, except ls without arguments. if try execute ls -lah, works, simple ls won't, receiving following error:

ls: fts_open: no such file or directory 

here snippet of code: (just essential)

pid = fork();       if (pid==0)       {         puts("child");         puts(args[0]);         puts(args[1]);         printf("%d\n", strlen(args[1]));         args[2] = null;         execvp(args[0], args);       }       else wait(null);       puts("back parent");     } 

and here output ls:

ls child ls  0 ls: fts_open: no such file or directory parent 

as can see, args[0] contains ls, args[1] empty, there no arguments, length of args[1] 0, keep getting error.

any idea on be?

edit:

kudos jonathan leffler finding out: (also, seems issue on mac)

the point args[1] not empty, so, os tries open '' file, which, obviously, not exists, and, looks, can't created, since not name.

so, here did: check len of args[1]. if 0, set null. (just freeing memory did not helped)

pid = fork();       if (pid==0)       {         puts("child");         puts(args[0]);         puts(args[1]);         if (strlen(args[1]) == 0)             args[1] = 0;         args[2] = null;         execvp(args[0], args);       }       else wait(null);       puts("back parent");     } 

if there no more arguments, pointer should null, not non-null pointer 0 length string.

pid = fork(); if (pid==0) {     puts("child");     puts(args[0]);     fflush(stdout);     args[1] = 0;     execvp(args[0], args);     fprintf(stderr, "failed exec %s\n", args[0]);     exit(1); } else     wait(null); puts("back parent"); 

just out of pure curiosity, tried @ command line:

$ ls '' ls: fts_open: no such file or directory $ 

are running on mac too? (to surprised see same message doesn't begin describe reaction!) what's more intriguing creating file fts_open doesn't seem rid of error message. weird behaviour ls, in response invalid request (there no file names empty string).