我试图创建与内建命令的一个基本的外壳，和我遇到getopt的一些问题。 这里是输出（使用的valgrind）：
$ mkdir -p foo/bar
mkdir
-p
foo/bar
FLAGON
$ mkdir -p foo/test
mkdir
-p
foo/test
==15377== Invalid read of size 1
==15377== at 0x5201BBE: _getopt_internal_r (in /usr/lib/libc-2.17.so)
==15377== by 0x5202CEA: _getopt_internal (in /usr/lib/libc-2.17.so)
==15377== by 0x5202D37: getopt (in /usr/lib/libc-2.17.so)
==15377== by 0x40351A: shell_ns_cmd_mkdir (shell.c:542)
==15377== by 0x403AB4: normal_shell_cb (shell.c:610)
==15377== by 0x402E8E: shell_mainloop (shell.c:402)
==15377== by 0x401B67: main (main.c:52)
==15377== Address 0x54e0912 is 2 bytes inside a block of size 3 free'd
==15377== at 0x4C2AD3C: free (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)
==15377== by 0x402C93: shell_mainloop (shell.c:384)
==15377== by 0x401B67: main (main.c:52)
==15377==
$
这里是源（裁剪）：
for (i = 0; i < argc; i++) {
puts(argv[i]);
}
while ((c = getopt(argc, argv, "p")) != -1) {
switch (c) {
case 'p':
puts("FLAGON");
mkparents = true;
break;
case '?':
fprintf(stderr, "invalid option -- %c", optopt);
ret = 127;
goto end;
break;
}
}
所以运行时，它第一次（ mkdir -p ）承认它（ -p ），它运行第二次，它没有。 有任何想法吗？
