{"categories":[],"width":"100%","provider_url":"https://hatena.blog","published":"2021-04-02 23:59:38","type":"rich","url":"https://tokuchan3515.hatenablog.com/entry/2021/04/02/235938","version":"1.0","title":"exec\u30b7\u30b9\u30c6\u30e0\u30b3\u30fc\u30eb\u306f\u65e2\u5b58\u306e\u30d5\u30a1\u30a4\u30eb\u30c7\u30b9\u30af\u30ea\u30d7\u30bf\u3092\u4fdd\u6301\u3059\u308b","author_name":"tokuchan3515","height":"190","author_url":"https://blog.hatena.ne.jp/tokuchan3515/","image_url":null,"blog_url":"https://tokuchan3515.hatenablog.com/","blog_title":"\u5099\u5fd8\u9332\u3084\u3081\u305f","provider_name":"Hatena Blog","description":"\u3064\u307e\u308a\uff0c\u6b21\u306e\u30d7\u30ed\u30b0\u30e9\u30e0\u306f\uff0cls\u30b3\u30de\u30f3\u30c9\u306e\u51fa\u529b\u3092\u6a19\u6e96\u51fa\u529b\u306b\u51fa\u3059\u306e\u3067\u306f\u306a\u304f\uff0cfoo.txt\u306b\u66f8\u304d\u8fbc\u3080\uff0e #include <fcntl.h> #include <stdio.h> #include <unistd.h> int main(void) { close(STDOUT_FILENO); int fd = open(\"foo.txt\", O_CREAT | O_WRONLY, 0644); if (fd != STDOUT_FILENO) { printf(\"fd: %d, stdout: %d\\n\", fd, STDOUT_FILENO); } else { execl(\"/bin/ls\u2026","html":"<iframe src=\"https://hatenablog-parts.com/embed?url=https%3A%2F%2Ftokuchan3515.hatenablog.com%2Fentry%2F2021%2F04%2F02%2F235938\" title=\"exec\u30b7\u30b9\u30c6\u30e0\u30b3\u30fc\u30eb\u306f\u65e2\u5b58\u306e\u30d5\u30a1\u30a4\u30eb\u30c7\u30b9\u30af\u30ea\u30d7\u30bf\u3092\u4fdd\u6301\u3059\u308b - \u5099\u5fd8\u9332\u3084\u3081\u305f\" class=\"embed-card embed-blogcard\" scrolling=\"no\" frameborder=\"0\" style=\"display: block; width: 100%; height: 190px; max-width: 500px; margin: 10px 0px;\"></iframe>"}