{"id":381,"date":"2016-08-14T11:07:50","date_gmt":"2016-08-14T03:07:50","guid":{"rendered":"http:\/\/www.5x44.cn\/?p=381"},"modified":"2016-09-07T11:10:48","modified_gmt":"2016-09-07T03:10:48","slug":"vfork%e5%87%bd%e6%95%b0","status":"publish","type":"post","link":"https:\/\/www.5x44.cn\/?p=381","title":{"rendered":"vfork\u51fd\u6570"},"content":{"rendered":"<p>vfork\u548cfork\u51fd\u6570\u7684\u8c03\u7528\u65b9\u6cd5\uff08calling sequence\uff09\u548c\u8fd4\u56de\u503c\u662f\u4e00\u6837\u3002\u4f46\u662f\u4e24\u4e2a\u51fd\u6570\u7684\u8bed\u4e49\u4e0d\u540c\u3002<\/p>\n<p>\u5f53\u76ee\u5730\u662f\u4f7f\u7528<span style=\"color: #993300;\">exec<\/span>\u5efa\u7acb\u4e00\u4e2a\u65b0\u7684\u5b50\u8fdb\u7a0b\u65f6\uff0c\u53ef\u4ee5\u4f7f\u7528<span style=\"color: #993300;\">vfork<\/span>\u3002<span style=\"color: #993300;\">vfork<\/span>\u548c<span style=\"color: #993300;\">fork<\/span>\u5efa\u7acb\u65b0\u8fdb\u7a0b\u662f\u4e00\u6837\u7684\uff0c\u53ea\u662f\u4e0d\u590d\u5236\u7236\u8fdb\u7a0b\u7684\u5730\u5740\u7a7a\u95f4\u5230\u5b50\u8fdb\u7a0b\u4e2d\uff0c\u5c31\u50cf\u5b50\u8fdb\u7a0b\u4e0d\u5f15\u7528\u90a3\u4e9b\u5730\u5740\u7a7a\u95f4\u4e00\u6837\uff0c\u5b50\u8fdb\u7a0b\u53ea\u662f\u5728<span style=\"color: #993300;\">vfork<\/span>\u540e\u7acb\u5373\u8c03\u7528<span style=\"color: #993300;\">exec<\/span>\u3002\u53cd\u4e4b\uff0c\u5728\u5b50\u8fdb\u7a0b\u8c03\u7528<span style=\"color: #993300;\">exec<\/span>\u6216<span style=\"color: #993300;\">exit<\/span>\u4e4b\u524d\uff0c\u5b83\u90fd\u662f\u5728\u7236\u8fdb\u7a0b\u7684\u5730\u5740\u7a7a\u95f4\u4e2d\u4ee3\u66ff\u590d\u5236\u5730\u5740\u7a7a\u95f4\u3002\u8fd9\u79cd\u4f18\u5316\u5728\u4e00\u4e9bunix\u7cfb\u7edf\u7684\u9875\u5f0f\u865a\u62df\u5185\u5b58\u4e0a\u6709\u6548\u7387\u7684\u589e\u52a0\u3002<\/p>\n<p><span style=\"color: #993300;\">vfork<\/span>\u548c<span style=\"color: #993300;\">fork<\/span>\u7684\u53e6\u4e00\u4e2a\u4e0d\u540c\u662f\uff0c<span style=\"color: #993300;\">vfork<\/span>\u53ef\u4ee5\u4fdd\u8bc1\u5b50\u8fdb\u7a0b\u5148\u8fd0\u884c\uff0c\u76f4\u5230\u5b50\u8fdb\u7a0b\u8c03\u7528<span style=\"color: #993300;\">exec<\/span>\u6216<span style=\"color: #993300;\">exit<\/span>\u3002\u5f53\u5b50\u8fdb\u7a0b\u8c03\u7528\u5176\u5b83\u7a0b\u5e8f\u65f6\u7236\u8fdb\u7a0b\u624d\u7ee7\u7eed\u8fd0\u884c\u3002\u4f46\u8fd9\u5bb9\u6613\u5f15\u8d77\u6b7b\u9501\uff0c\u56e0\u4e3a\u5982\u679c\u5b50\u8fdb\u7a0b\u7684\u8fd0\u884c\u662f\u4f9d\u8d56\u4e8e\u7236\u8fdb\u7a0b\u7684\u8fd0\u884c\u72b6\u6001\u7684\u8bdd\uff0c\u5c31\u4f1a\u53d1\u751f\u6b7b\u9501\u3002<\/p>\n<p>vfork\u548cfork\u7684\u6700\u5927\u4e0d\u540c\u662fvfork\u7684\u5b50\u8fdb\u7a0b\u751f\u6d3b\u5728\u7236\u8fdb\u7a0b\u7684\u5730\u5740\u7a7a\u95f4\u4e2d\uff0c\u4f46\u4e0d\u590d\u5236\u7236\u8fdb\u7a0b\u7684\u5730\u5740\u7a7a\u95f4\u5230\u81ea\u5df1\u7684\u8fdb\u7a0b\u4e2d\u6765\uff0c\u8fd9\u6837\u5b50\u8fdb\u7a0b\u7684\u5b50\u8fdb\u7a0b\u5c31\u65e0\u6cd5\u5f97\u5230\u7956\u5148\u8fdb\u7a0b\u7684\u5730\u5740\u7a7a\u95f4\u3002\u5982\uff1a<\/p>\n<p>A&gt;B&gt;C<\/p>\n<p>A\u662f\u7236\u8fdb\u7a0b\uff0cB\u662f\u5b50\u8fdb\u7a0b\uff0cC\u662fB\u7684\u5b50\u8fdb\u7a0b\u3002B\u53ef\u4ee5\u5f97\u5230A\u7684\u5730\u5740\u7a7a\u95f4\uff0c\u4f46C\u4e0d\u80fd\u5f97\u5230A\u7684\u5730\u5740\u7a7a\u95f4\u3002\uff08\u8fd9\u662f\u6211\u7684\u731c\u6d4b\uff1aP\uff09<\/p>\n<blockquote><p>\u6ce8\u610f\uff1a\u5728\u4f7f\u7528vfork\u7684\u65f6\u5019\uff0c\u5b50\u8fdb\u7a0b\u8981\u6ce8\u610f\u7528exit\u9000\u51fa\u3002\u56e0\u4e3avfork\u7684\u5b50\u8fdb\u7a0b\u751f\u6d3b\u5728\u7236\u8fdb\u7a0b\u7684\u5730\u5740\u7a7a\u95f4\u4e2d\uff0c\u6240\u4ee5\u5b50\u8fdb\u7a0b\u4e0d\u7528exit\u9000\u51fa\u7684\u8bdd\uff0c\u4f1a\u4f7f\u7236\u8fdb\u7a0b\u9000\u51fa\u201c\u4e24\u6b21\u201d\u3002\u4f8b\u5982\uff1a<\/p>\n<p>#include &lt;stdio.h&gt;<br \/>\n#include &lt;unistd.h&gt;<\/p>\n<p>static void f1(void), f2(void);<\/p>\n<p>int main(void)<br \/>\n{<br \/>\nf1();<br \/>\nf2();<br \/>\n_exit(0);<br \/>\n}<\/p>\n<p>static void f1(void)<br \/>\n{<br \/>\nint i=0;<br \/>\npid_t pid;<br \/>\nif ((pid = vfork()) &lt; 0)<br \/>\nprintf(&#8220;vfork error&#8221;);<br \/>\nif (pid == 0)\u00a0 \/\/\u5982\u679c\u4e0d\u5728\u8fd9\u91cc\u628a\u5b50\u8fdb\u7a0b\u9000\u51fa\u7684\u8bdd\uff0cf1()\u5728\u5b50\u8fdb\u7a0b\u9000\u51fa\u4e00\u6b21\uff0c\u4e4b\u540e\u5728\u7236\u8fdb\u7a0b\u9000\u51fa\u65f6\u4f1a\u51fa\u9519\uff0c\u56e0\u4e3a\u5df2\u7ecf\u5728\u5b50\u8fdb\u7a0b\u9000\u51fa\u8fc7\u4e86\u3002<br \/>\n_exit(0);<br \/>\n}<\/p>\n<p>static void f2(void)<br \/>\n{<\/p>\n<p>char\u00a0\u00a0\u00a0\u00a0 buf[10];<br \/>\nint\u00a0\u00a0\u00a0\u00a0\u00a0 i;<\/p>\n<p>for (i = 0; i &lt; sizeof(buf); i++)<br \/>\nbuf[i] = 0;<br \/>\n}<\/p><\/blockquote>\n","protected":false},"excerpt":{"rendered":"<p>vfork\u548cfork\u51fd\u6570\u7684\u8c03\u7528\u65b9\u6cd5\uff08calling sequence\uff09\u548c\u8fd4\u56de\u503c\u662f\u4e00\u6837\u3002\u4f46\u662f\u4e24\u4e2a\u51fd\u6570\u7684\u8bed\u4e49\u4e0d\u540c\u3002 \u5f53\u76ee\u5730\u662f\u4f7f\u7528exec\u5efa\u7acb\u4e00\u4e2a\u65b0\u7684\u5b50\u8fdb\u7a0b\u65f6\uff0c\u53ef\u4ee5\u4f7f&#8230;<\/p>\n<p class=\"read-more\"><a class=\"btn btn-default\" href=\"https:\/\/www.5x44.cn\/?p=381\"> Read More<span class=\"screen-reader-text\">  Read More<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[18],"tags":[],"class_list":["post-381","post","type-post","status-publish","format-standard","hentry","category-apue"],"_links":{"self":[{"href":"https:\/\/www.5x44.cn\/index.php?rest_route=\/wp\/v2\/posts\/381","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.5x44.cn\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.5x44.cn\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.5x44.cn\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.5x44.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=381"}],"version-history":[{"count":4,"href":"https:\/\/www.5x44.cn\/index.php?rest_route=\/wp\/v2\/posts\/381\/revisions"}],"predecessor-version":[{"id":472,"href":"https:\/\/www.5x44.cn\/index.php?rest_route=\/wp\/v2\/posts\/381\/revisions\/472"}],"wp:attachment":[{"href":"https:\/\/www.5x44.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=381"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.5x44.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=381"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.5x44.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=381"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}