#include /* EACCESS, ELOOP, ENAMETOOLONG, ENOENT, ENOTDIR, errno */ #include /* fprintf(3) */ #include /* stderr */ #include /* strerror(3) */ #include /* EX_OSERR, EX_NOPERM, EX_NOINPUT, EX_UNAVAILABLE, * EX_USAGE */ #include /* chdir(2) */ static char *program_name = "pschdir"; int main(int argc, char *argv[]){ if(argc < 3){ fprintf(stderr, "Usage: %s [directory] [command (argument...)]\n", argv[0] == NULL ? program_name : argv[0]); return EX_USAGE; } if(chdir(argv[1]) != 0){ fprintf(stderr, "%s: %s: %s\n", argv[0], argv[1], strerror(errno)); switch(errno){ case EACCES: return EX_NOPERM; case ELOOP: return EX_UNAVAILABLE; case ENAMETOOLONG: return EX_OSERR; case ENOENT: return EX_NOINPUT; case ENOTDIR: return EX_NOINPUT; default: return EX_UNAVAILABLE; } } execvp(argv[2], argv + 2); }