{"id":432734,"date":"2021-04-18T16:44:50","date_gmt":"2021-04-18T08:44:50","guid":{"rendered":"http:\/\/4563.org\/?p=432734"},"modified":"2021-04-18T16:44:50","modified_gmt":"2021-04-18T08:44:50","slug":"c-%e7%b4%ab%e7%a6%81%e5%9f%8e-fork-execvp-%e6%98%af%e4%b8%aa%e5%95%a5%ef%bc%9f%e5%a5%bd%e9%9a%be%e6%89%be%e5%88%b0%e8%b5%84%e6%96%99%e5%95%8a","status":"publish","type":"post","link":"http:\/\/4563.org\/?p=432734","title":{"rendered":"C \u7d2b\u7981\u57ce Fork(), execvp \u662f\u4e2a\u5565\uff1f\u597d\u96be\u627e\u5230\u8d44\u6599\u554a"},"content":{"rendered":"
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C \u7d2b\u7981\u57ce Fork(), execvp \u662f\u4e2a\u5565\uff1f\u597d\u96be\u627e\u5230\u8d44\u6599\u554a <\/h1>\n

<\/p>\n

\n
\u8cc7\u6df1\u5927\u4f6c : AkideLiu <\/span> <\/i> 4<\/span> <\/div>\n
<\/div>\n<\/p><\/div>\n<\/p><\/div>\n<\/p><\/div>\n
<\/p>\n

\u641c\u4e86\u641c\u6bd4\u8f83\u6709\u4ef7\u503c\u7684\u662f\u8fd9\u4e00\u7bc7<\/p>\n

https:\/\/ece.uwaterloo.ca\/~dwharder\/icsrts\/Tutorials\/fork_exec\/<\/p>\n

 #include <stdio.h>  \/* This program forks and and the prints whether the process is  *   - the child (the return value of fork() is 0), or  *   - the parent (the return value of fork() is not zero)  *  * When this was run 100 times on the computer the author is  * on, only twice did the parent process execute before the  * child process executed.  *  * Note, if you juxtapose two strings, the compiler automatically  * concatenates the two, e.g., \"Hello \" \"world!\"  *\/  int main( void ) {  char *argv[3] = {\"Command-line\", \".\", NULL};   int pid = fork();   if ( pid == 0 ) {   execvp( \"find\", argv );  }   \/* Put the parent to sleep for 2 seconds--let the child finished executing *\/  wait( 2 );   printf( \"Finished executing the parent processn\"          \" - the child won't get here--you will only see this oncen\" );   return 0; }  <\/code><\/pre>\n
Stack Overflow \u4e0a\u5f88\u5c11\u6709\u4eba\u8ba8\u8bba\u8fd9\u4e2a\u8bdd\u9898\uff0c\u6709\u5927\u4f6c\u80fd\u53d1\u4e00\u4e0b\u8d44\u6599\u5417<\/p>\n<\/p><\/div>\n
 \u5927\u4f6c\u6709\u8a71\u8aaa<\/b> (18<\/span>)        <\/div>\n
 <\/div>\n<\/p><\/div>\n<\/p><\/div>\n
    \n
  • \n
    \n
    \n
     \u8cc7\u6df1\u5927\u4f6c : kokutou <\/span>  <\/div>\n
     <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                 \u4f60\u8fd9\u91cc\u9762\u4e0d\u662f\u5199\u7684\u5f88\u6e05\u695a\u4e86…                                                            <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
     \u8cc7\u6df1\u5927\u4f6c : GeruzoniAnsasu <\/span>  <\/div>\n
     <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                 21 \u5929\u524d\u56de\u590d\u4e86 hm20062006ok \u521b\u5efa\u7684\u4e3b\u9898 \u203a Google \u203a \u600e\u6837\u8ba9\u641c\u7d22\u5f15\u64ce\u66f4\u597d\u7684\u7406\u89e3\u6211\u7684\u9700\u6c42\uff1f
    \u5982\u679c\u7528 Google\uff0c\u53ef\u4ee5\u591a\u770b\u770b stackoverflow \u7684\u95ee\u9898\u662f\u600e\u4e48\u63d0\u7684\uff0c\u591a\u5b66\u5b66\u5c31\u597d\u4e86<\/p>\n
    ———-<\/p>\n
    … fork() \u8fd9\u79cd\u57fa\u7840\u95ee\u9898\u767e\u5ea6\u90fd\u80fd\u641c\u5230\uff0c\u522b\u8bf4 google \u4e86\uff0c\u4e0d\u61c2\u4f60\u60f3\u627e\u7684\u8d44\u6599\u662f\u5565                                                            <\/p><\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
     \u4e3b<\/span> \u8cc7\u6df1\u5927\u4f6c : AkideLiu <\/span>  <\/div>\n
     <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                 @kokutou \u6069 demo \u5199\u7684\u4e0d\u662f\u5f88\u590d\u6742\uff0c\u6ce8\u91ca\u89e3\u91ca\u7684\u4e5f\u5f88\u6e05\u6670\u3002<\/p>\n
    \u4f46\u662f\u8fd8\u662f\u4e0d\u592a\u61c2\u8fd9\u6bb5\u4ee3\u7801\u5b9e\u9645\u8fd0\u884c\u7684\u903b\u8f91\u3002<\/p>\n
    \u6211\u7684\u7406\u89e3\u662f\u8fd9\u6837\u7684\uff0c\u4f8b\u5b50\u91cc\u9762\u4ece main \u91cc\u9762\u62c6\u51fa\u6765\u4e00\u4e2a child \u53bb\u6267\u884c\u547d\u4ee4\u884c\u64cd\u4f5c\uff0cparent \u90e8\u5206\u5728 child \u8fd0\u884c\u5b8c\u6210\u518d\u8fd0\u884c\uff0c\u90a3\u8fd9\u6837\u505a\u7684\u610f\u4e49\u5728\u54ea\u91cc\u5462\uff1f<\/p>\n
    \u5982\u679c\u6211\u60f3\u591a\u6b21\u6267\u884c\u591a\u7ec4\u547d\u4ee4\u7684\u8bdd\u662f\u4f7f\u7528\u591a\u6b21 fork \u6765\u5b9e\u73b0\u5417\uff1f                                                            <\/p><\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
     \u8cc7\u6df1\u5927\u4f6c : wjm2038 <\/span>  <\/div>\n
     <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                 man fork
    man execvp                                                            <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
     \u8cc7\u6df1\u5927\u4f6c : ipwx <\/span>  <\/div>\n
     <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                 @AkideLiu fork \u548c exec \u90fd\u662f posix \u64cd\u4f5c\u7cfb\u7edf\u7684\u6982\u5ff5\u3002\u5b9e\u9645\u4e0a windows \u662f\u4e0d\u652f\u6301\u8fd9\u4e24\u4e2a\u64cd\u4f5c\u7684\u3002\u3002\u3002<\/p>\n
    \u8fd9\u4e0d\u662f C \u8bed\u8a00\u7684\u77e5\u8bc6\uff0c\u662f\u64cd\u4f5c\u7cfb\u7edf\u7684\u77e5\u8bc6\u3002                                                            <\/p><\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
     \u8cc7\u6df1\u5927\u4f6c : ch2 <\/span>  <\/div>\n
     <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                 \u8fd9\u4e2a\u662f c \u8bed\u8a00\u7684 unistd \u5e93\u7684\u5185\u5bb9\uff0c\u5b83\u5176\u5b9e\u662f\u64cd\u4f5c\u7cfb\u7edf\u7684\u7279\u6027\uff0c\u51c6\u786e\u7684\u8bf4\u90fd\u662f syscall \u7cfb\u7edf\u8c03\u7528\u7684\u5305\u88c5\u3002\u4f60\u60f3\u5b66\u8fd9\u4e2a\u76f4\u63a5\u5b66 Linux \u8fdb\u7a0b\u6a21\u578b\u5c31\u662f\u4e86\uff0cmanpages \u91cc\u6709\u9488\u5bf9\u6bcf\u4e2a\u7cfb\u7edf\u8c03\u7528\u5bf9\u5e94\u7684\u51fd\u6570\u7684\u8be6\u7ec6\u8bf4\u660e                                                            <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
     \u8cc7\u6df1\u5927\u4f6c : ipwx <\/span>  <\/div>\n
     <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                 @AkideLiu <\/p>\n
    \u6211\u7684\u7406\u89e3\u662f\u8fd9\u6837\u7684\uff0c\u4f8b\u5b50\u91cc\u9762\u4ece main \u91cc\u9762\u62c6\u51fa\u6765\u4e00\u4e2a child \u53bb\u6267\u884c\u547d\u4ee4\u884c\u64cd\u4f5c\uff0cparent \u90e8\u5206\u5728 child \u8fd0\u884c\u5b8c\u6210\u518d\u8fd0\u884c\uff0c\u90a3\u8fd9\u6837\u505a\u7684\u610f\u4e49\u5728\u54ea\u91cc\u5462\uff1f
    ====<\/p>\n
    \u610f\u4e49\u5f88\u591a\u3002\u4e3b\u8981\u662f\u4f60\u6ca1\u6709\u5199\u8fc7\u8fd9\u6837\u7684\u7a0b\u5e8f\u3002\u6bd4\u5982\u6211\u60f3\u8fd0\u884c\u4e00\u4e2a\u5916\u90e8\u547d\u4ee4\uff0c\u4f46\u662f\u8981\u622a\u83b7\u6240\u6709\u5b83\u7684\u8f93\u51fa\u3002fork + exec \u7684\u505a\u6cd5\u5c31\u662f\u7236\u8fdb\u7a0b\u5728 fork \u524d\u7528 pipefd \u5148\u6253\u5f00\u4e00\u4e2a\u7ba1\u9053\uff0c\u7531\u4e8e fork \u4ee5\u540e\u5b50\u8fdb\u7a0b\u548c\u7236\u8fdb\u7a0b\u5728\u6700\u521d\u5171\u4eab\u6240\u6709\u6587\u4ef6\u63cf\u8ff0\u7b26\uff0c\u6240\u4ee5\u5b50\u8fdb\u7a0b\u5f80\u7ba1\u9053\u4e00\u5934\u5199\uff0c\u7236\u8fdb\u7a0b\u5c31\u80fd\u5728\u53e6\u4e00\u5934\u8bfb\u5230\u3002\u63a5\u7740\u7528 dup2 \u7528 pipefd \u66ff\u6362\u6389\u6807\u51c6 stdout \u548c stderr\uff0c\u8fd9\u6837\u5c31\u80fd\u8ba9\u5b50\u8fdb\u7a0b\u7684\u6807\u51c6\u8f93\u51fa\u548c\u9519\u8bef\u8f93\u51fa\u90fd\u76f4\u63a5\u5b9a\u5411\u5230\u7ba1\u9053\u3002\u6700\u540e\u7528 exec \u8ba9\u67d0\u4e2a\u547d\u4ee4\u4ee3\u66ff\u76ee\u524d\u7684\u7a0b\u5e8f\u5728\u5f53\u524d\u8fdb\u7a0b\u53f7\uff08\u4ee5\u53ca\u8fd9\u4e2a pipefd \u9876\u66ff\u6389 stdout \u548c stderr \u7684\u4e0a\u4e0b\u6587\uff09\u4e2d\u8fd0\u884c\u3002<\/p>\n
    \u8fd9\u4e48\u4e00\u64cd\u4f5c\uff0c\u7236\u8fdb\u7a0b\u5c31\u80fd\u76f4\u63a5\u4ece\u7ba1\u9053\u8bfb\u5230\u8fd9\u4e2a\u547d\u4ee4\u7684\u8f93\u51fa\u4e86\u3002<\/p>\n
    https:\/\/stackoverflow.com\/questions\/2605130\/redirecting-exec-output-to-a-buffer-or-file                                                            <\/p><\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
     \u4e3b<\/span> \u8cc7\u6df1\u5927\u4f6c : AkideLiu <\/span>  <\/div>\n
     <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                 @ch2 
    @ipwx <\/p>\n
    \u8c22\u8c22\u4e24\u4f4d\u7684\u89e3\u7b54\u3002\u901a\u8fc7\u4e24\u4f4d\u7684\u56de\u7b54\u5927\u6982\u662f\u8981\u597d\u597d\u770b\u770b\u8fdb\u7a0b\u8c03\u7528\u548c IO \u539f\u7406\u8fd9\u4e00\u5757\u4e86\u3002<\/p>\n
    ——<\/p>\n
    \u770b\u5b8c\u8fd9\u4e2a\u4f8b\u5b50\uff0c\u6211\u597d\u60f3\u660e\u767d\u4e00\u70b9\u3002\u5c31\u662f\u8bf4\u5982\u679c\u53ea\u6709\u4e00\u4e2a main \u8fdb\u7a0b\u662f\u6ca1\u529e\u6cd5 synchronized stdout \u5230\u591a\u4e2a\u4e0d\u540c\u7684 buffer \u6216\u8005 file \u7684\uff0c\u901a\u8fc7 fork \u51fa\u6765 child \u53ef\u4ee5\u5b9e\u73b0\u8fd9\u4e00\u70b9\u3002child \u8d1f\u8d23\u6267\u884c\uff0cparent \u8d1f\u8d23\u5904\u7406\u6700\u7ec8\u7ed3\u679c(\u5982\u679c\u9700\u8981\u7684\u8bdd\uff0c\u6bd4\u5982 pipe)                                                            <\/p><\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
     \u8cc7\u6df1\u5927\u4f6c : mingl0280 <\/span>  <\/div>\n
     <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                 man exec \u6709\u8be6\u7ec6\u89e3\u91ca\u554a\u2026\u2026                                                            <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
     \u8cc7\u6df1\u5927\u4f6c : err1y <\/span>  <\/div>\n
     <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                 \u5efa\u8bae\u7cfb\u7edf\u7684\u770b\u4e00\u4e0b\u300a unix \u73af\u5883\u9ad8\u7ea7\u7f16\u7a0b\u300b\u8fd9\u672c\u4e66\uff0c\u6216\u8005\u5f53\u5de5\u5177\u4e66\u67e5\u4e5f\u884c                                                            <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
     \u8cc7\u6df1\u5927\u4f6c : sarvatathagata <\/span>  <\/div>\n
     <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                 \u60f3\u8d77 kill \u7d2b\u7981\u57ce\u90a3\u4e2a\u7b11\u8bdd\u4e86                                                            <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
     \u8cc7\u6df1\u5927\u4f6c : ManjusakaL <\/span>  <\/div>\n
     <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                 \u5efa\u8bae\u770b\u4e00\u4e0b Unix \u73af\u5883\u9ad8\u7ea7\u7f16\u7a0b                                                            <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
     \u8cc7\u6df1\u5927\u4f6c : Pagliacii <\/span>  <\/div>\n
     <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                 https:\/\/pages.cs.wisc.edu\/~remzi\/OSTEP\/cpu-api.pdf                                                            <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
     \u8cc7\u6df1\u5927\u4f6c : iseki <\/span>  <\/div>\n
     <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                 \u770b\u4e86\u534a\u5929\u6ca1\u660e\u767d \u201c\u7d2b\u7981\u57ce fork\u201d \u662f\u4ec0\u4e48\u4e1c\u897f\uff0c\u6562\u60c5\u662f\u5b50\u8fdb\u7a0b\u2026                                                            <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
     \u8cc7\u6df1\u5927\u4f6c : lance6716 <\/span>  <\/div>\n
     <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                 @AkideLiu \u6709\u7684\u8d44\u6e90\uff08\u4ee5 stdout \u4e3a\u4f8b\uff09\u662f\u6bcf\u4e2a\u8fdb\u7a0b\u53ea\u80fd\u6709\u4e00\u4efd\u7684\uff0cfork \u4e4b\u540e\u662f\u4e24\u4e2a\u8fdb\u7a0b\uff0c\u6240\u4ee5\u5c31\u80fd\u7528\u5404\u81ea\u7684\u4e86\u3002\u8fd9\u79cd\u8d44\u6e90\u8fd8\u6709\u5185\u5b58\u554a\u4e4b\u7c7b\u7684<\/p>\n
    \u4e0e\u6b64\u5e26\u6765\u7684\u5c31\u662f\uff0c\u65e2\u7136\u4e24\u4e2a\u8fdb\u7a0b\u662f\u5404\u81ea\u201c\u72ec\u7acb\u201d\u7684\u8d44\u6e90\uff0c\u8fdb\u7a0b\u901a\u4fe1\u5c31\u8981\u627e\u522b\u7684\u529e\u6cd5                                                            <\/p><\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
     \u8cc7\u6df1\u5927\u4f6c : carlclone <\/span>  <\/div>\n
     <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                 \u4eca\u5929 6s081 \u624d\u521a\u770b\u5230\u8fd9\u4e2a\uff0c\u592a\u5de7\u4e86\uff0c\u521a\u597d\u8bf4\u5230\u4e3a\u4ec0\u4e48\u4e0d\u662f forkexec \u800c\u662f fork+exec\uff0c\u4e0a\u5df2\u7ecf\u89e3\u91ca\u5f97\u5f88\u6e05\u695a\u4e86                                                            <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
     \u8cc7\u6df1\u5927\u4f6c : irytu <\/span>  <\/div>\n
     <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                 \u6bd4\u5982\u5141\u8bb8\u4f60\u8fdb\u884c IO \u91cd\u5b9a\u5411\uff0c\u53bb\u5b66\u5b66 6.828 \u6216\u8005 6.S081 \u5427                                                            <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
     \u8cc7\u6df1\u5927\u4f6c : no1xsyzy <\/span>  <\/div>\n
     <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                 IIRC\uff0c\u8fd8\u6709\u4e00\u79cd\u7528\u9014\uff0cnginx \u591a\u4e2a worker \u8fdb\u7a0b\u540c\u65f6\u76d1\u542c\u4e00\u4e2a\u7aef\u53e3\uff0c\u7528 fork \u6765\u5171\u4eab fd \uff08\u6253\u5f00\u7684\u7f51\u7edc\u7aef\u53e3\u4e5f\u662f fd \uff09                                                            <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n","protected":false},"excerpt":{"rendered":"
    C \u7d2b\u7981\u57ce Fork(), exe…<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[],"tags":[],"_links":{"self":[{"href":"http:\/\/4563.org\/index.php?rest_route=\/wp\/v2\/posts\/432734"}],"collection":[{"href":"http:\/\/4563.org\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/4563.org\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/4563.org\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/4563.org\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=432734"}],"version-history":[{"count":0,"href":"http:\/\/4563.org\/index.php?rest_route=\/wp\/v2\/posts\/432734\/revisions"}],"wp:attachment":[{"href":"http:\/\/4563.org\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=432734"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/4563.org\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=432734"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/4563.org\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=432734"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}