{"id":967,"date":"2022-11-12T04:18:58","date_gmt":"2023-04-15T00:11:02","guid":{"rendered":"https:\/\/www.silicloud.com\/ja\/blog\/index.php\/2023\/11\/30\/c-c%e3%81%a7execvp%e9%96%a2%e6%95%b0%e3%82%92%e4%bd%bf%e7%94%a8%e3%81%99%e3%82%8b%e6%96%b9%e6%b3%95%e3%81%af%e3%81%a9%e3%81%86%e3%81%a7%e3%81%99%e3%81%8b%e3%80%82\/"},"modified":"2025-08-01T03:55:14","modified_gmt":"2025-07-31T18:55:14","slug":"c-c%e3%81%a7execvp%e9%96%a2%e6%95%b0%e3%82%92%e4%bd%bf%e7%94%a8%e3%81%99%e3%82%8b%e6%96%b9%e6%b3%95%e3%81%af%e3%81%a9%e3%81%86%e3%81%a7%e3%81%99%e3%81%8b%e3%80%82","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/ja\/blog\/c-c%e3%81%a7execvp%e9%96%a2%e6%95%b0%e3%82%92%e4%bd%bf%e7%94%a8%e3%81%99%e3%82%8b%e6%96%b9%e6%b3%95%e3%81%af%e3%81%a9%e3%81%86%e3%81%a7%e3%81%99%e3%81%8b%e3%80%82\/","title":{"rendered":"C\/C++\u3067execvp()\u95a2\u6570\u3092\u4f7f\u7528\u3059\u308b\u65b9\u6cd5\u306f\u3069\u3046\u3067\u3059\u304b\u3002"},"content":{"rendered":"

\u3053\u306e\u8a18\u4e8b\u3067\u306f\u3001C \/ C++\u3067execvp()\u95a2\u6570\u3092\u4f7f\u7528\u3059\u308b\u65b9\u6cd5\u306b\u3064\u3044\u3066\u898b\u3066\u3044\u304d\u307e\u3059\u3002<\/p>\n

UNIX\u306b\u304a\u3044\u3066\u3001C\u30d7\u30ed\u30b0\u30e9\u30e0\u3092\u4f7f\u7528\u3057\u3066\u5225\u306e\u30d7\u30ed\u30b0\u30e9\u30e0\u3092\u5b9f\u884c\u3057\u305f\u3044\u5834\u5408\u306f\u3001execvp()\u95a2\u6570\u304c\u975e\u5e38\u306b\u4fbf\u5229\u3067\u3059\u3002<\/p>\n

\u6ce8\u610f\uff1a\u3053\u306e\u6a5f\u80fd\u306fUNIX\u30d9\u30fc\u30b9\u306e\u30aa\u30da\u30ec\u30fc\u30c6\u30a3\u30f3\u30b0\u30b7\u30b9\u30c6\u30e0\u306b\u306e\u307f\u9069\u7528\u3055\u308c\u307e\u3059\u3002Windows\u3067\u306f\u6a5f\u80fd\u3057\u307e\u305b\u3093\u3002<\/p>\n

\u79c1\u305f\u3061\u306e\u30d7\u30ed\u30b0\u30e9\u30e0\u304b\u3089UNIX\u30b3\u30de\u30f3\u30c9\u3092\u5b9f\u884c\u3059\u308b\u65b9\u6cd5\u306b\u3064\u3044\u3066\u3001\u5177\u4f53\u7684\u306a\u4f8b\u3092\u4f7f\u3063\u3066\u898b\u3066\u307f\u307e\u3057\u3087\u3046\uff01<\/p>\n

\n

execvp()\u306e\u57fa\u672c\u7684\u306a\u69cb\u6587<\/h2>\n

\u3053\u306e\u95a2\u6570\u306f\u3001\u5b9f\u884c\u3059\u308bUNIX\u30b3\u30de\u30f3\u30c9\u306e\u540d\u524d\u3092\u6700\u521d\u306e\u5f15\u6570\u3068\u3057\u3066\u53d7\u3051\u53d6\u308a\u307e\u3059\u3002<\/p>\n

\u3053\u306e\u90e8\u5206\u306f\u300cunistd.h\u300d\u30d8\u30c3\u30c0\u30fc\u30d5\u30a1\u30a4\u30eb\u306b\u542b\u307e\u308c\u3066\u3044\u308b\u305f\u3081\u3001\u30d7\u30ed\u30b0\u30e9\u30e0\u306b\u542b\u3081\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n

#<\/span>include<\/span> <unistd.h><\/span><\/span>\r\n\r\nint<\/span> execvp<\/span>(<\/span>const<\/span> char<\/span>*<\/span> command,<\/span> char<\/span>*<\/span> argv[<\/span>]<\/span>)<\/span>;<\/span>\r\n<\/code><\/pre>\n
\u3053\u3053\u3067\u306f\u3001\u300c\u30b3\u30de\u30f3\u30c9\u300d\u3068\u306f\u3001PATH\u74b0\u5883\u5909\u6570\u306e\u4e00\u90e8\u3067\u3042\u308b\u4efb\u610f\u306e\u30d0\u30a4\u30ca\u30ea\u5b9f\u884c\u53ef\u80fd\u30d5\u30a1\u30a4\u30eb\u3092\u6307\u3057\u307e\u3059\u3002\u3057\u305f\u304c\u3063\u3066\u3001\u30ab\u30b9\u30bf\u30e0\u30d7\u30ed\u30b0\u30e9\u30e0\u3092\u5b9f\u884c\u3057\u305f\u3044\u5834\u5408\u306f\u3001\u5fc5\u305a\u305d\u308c\u3092PATH\u5909\u6570\u306b\u8ffd\u52a0\u3057\u3066\u304f\u3060\u3055\u3044\uff01<\/p>\n
\u7b2c\u4e8c\u5f15\u6570\u306eargv\u306f\u3001\u30b3\u30de\u30f3\u30c9\u3078\u306e\u5f15\u6570\u306e\u30ea\u30b9\u30c8\u3092\u8868\u3057\u307e\u3059\u3002\u3053\u308c\u306fchar*\u306e\u6587\u5b57\u5217\u306e\u914d\u5217\u3067\u3059\u3002<\/p>\n
\u3053\u3053\u3067\u306f\u3001argv\u306b\u306f\u30b3\u30de\u30f3\u30c9\u3068\u305d\u306e\u5f15\u6570\u304c\u542b\u307e\u308c\u3066\u3044\u307e\u3059\u3002<\/p>\n
\u305f\u3068\u3048\u3070\u3001\u4e0b\u8a18\u306e\u914d\u5217\u306fargv\u306e\u5f62\u5f0f\u306b\u5f93\u3063\u3066\u3044\u307e\u3059\u3002<\/p>\n
char<\/span>*<\/span> argument_list[<\/span>]<\/span> =<\/span> {<\/span>\"ls\"<\/span>,<\/span> \"-l\"<\/span>,<\/span> NULL<\/span>}<\/span>;<\/span> \/\/ NULL terminated array of char* strings<\/span>\r\n\r\n\/\/ Ok! Will execute the command \"ls -l\"<\/span>\r\nexecvp<\/span>(<\/span>\"ls\"<\/span>,<\/span> argument_list)<\/span>;<\/span>\r\n<\/code><\/pre>\n
\u3053\u306e\u914d\u5217\u306f\u5fc5\u305aNULL\u3067\u7d42\u4e86\u3057\u306a\u3051\u308c\u3070\u306a\u308a\u307e\u305b\u3093\u3002\u3064\u307e\u308a\u3001argv\u306e\u6700\u5f8c\u306e\u8981\u7d20\u306fNULL\u30dd\u30a4\u30f3\u30bf\u3067\u306a\u3051\u308c\u3070\u306a\u308a\u307e\u305b\u3093\u3002<\/p>\n
\u79c1\u305f\u3061\u306eC\u30d7\u30ed\u30b0\u30e9\u30e0\u306f\u4eca\u3069\u3046\u306a\u308a\u307e\u3059\u304b\uff1f (Watashitachi no C puroguramu wa ima dou narimasu ka?)<\/h3>\n
\u3053\u306e\u6a5f\u80fd\u306f\u3001\u73fe\u5728\u306e\u30d7\u30ed\u30bb\u30b9\uff08C\u30d7\u30ed\u30b0\u30e9\u30e0\uff09\u306e\u5236\u5fa1\u3092\u30b3\u30de\u30f3\u30c9\u306b\u59d4\u8b72\u3057\u307e\u3059\u3002\u305d\u306e\u305f\u3081\u3001C\u30d7\u30ed\u30b0\u30e9\u30e0\u306f\u5373\u5ea7\u306b\u5b9f\u969b\u306e\u30b3\u30de\u30f3\u30c9\u3067\u7f6e\u304d\u63db\u3048\u3089\u308c\u307e\u3059\u3002<\/p>\n
\u3057\u305f\u304c\u3063\u3066\u3001execvp\uff08\uff09\u306e\u5f8c\u306b\u6765\u308b\u3082\u306e\u306f\u3001\u79c1\u305f\u3061\u306e\u30d7\u30ed\u30b0\u30e9\u30e0\u304c\u5b8c\u5168\u306b\u63a5\u53ce\u3055\u308c\u308b\u305f\u3081\u3001\u5b9f\u884c\u3055\u308c\u307e\u305b\u3093\uff01<\/p>\n
\u3057\u304b\u3057\u3001\u4f55\u3089\u304b\u306e\u7406\u7531\u3067\u30b3\u30de\u30f3\u30c9\u304c\u5931\u6557\u3057\u305f\u5834\u5408\u3001execvp()\u306f-1\u3092\u8fd4\u3057\u307e\u3059\u3002<\/p>\n
\u3057\u305f\u304c\u3063\u3066\u3001execvp()\u3092\u4f7f\u7528\u3059\u308b\u5834\u5408\u306f\u3001C\u30d7\u30ed\u30b0\u30e9\u30e0\u3092\u7dad\u6301\u3059\u308b\u305f\u3081\u306b\u901a\u5e38\u3001fork()\u3092\u4f7f\u7528\u3057\u3066\u6700\u521d\u306b\u65b0\u3057\u3044\u30d7\u30ed\u30bb\u30b9\u3092\u751f\u6210\u3057\u3001\u305d\u306e\u65b0\u3057\u3044\u30d7\u30ed\u30bb\u30b9\u4e0a\u3067execvp()\u3092\u4f7f\u7528\u3057\u307e\u3059\u3002<\/p>\n
\u3053\u308c\u306f\u300c\u30d5\u30a9\u30fc\u30af\u3068\u30a8\u30b0\u30bc\u30af\u300d\u3068\u547c\u3070\u308c\u308b\u30e2\u30c7\u30eb\u3067\u3042\u308a\u3001C\u8a00\u8a9e\u3092\u4f7f\u7528\u3057\u3066\u8907\u6570\u306e\u30d7\u30ed\u30bb\u30b9\u3092\u5b9f\u884c\u3059\u308b\u969b\u306e\u6a19\u6e96\u7684\u306a\u65b9\u6cd5\u3067\u3059\u3002<\/p>\n
\u3055\u3042\u3001\u3044\u304f\u3064\u304b\u306e\u4f8b\u3092\u898b\u3066\u3001\u3053\u306e\u95a2\u6570\u3092\u3088\u308a\u3088\u304f\u7406\u89e3\u3057\u307e\u3057\u3087\u3046\u3002\u307e\u305f\u3001C\u30d7\u30ed\u30b0\u30e9\u30e0\u3092\u6301\u3061\u306a\u304c\u3089\u3001fork()\u3068execvp()\u3092\u4f7f\u7528\u3059\u308b\u3053\u3068\u3082\u3042\u308a\u307e\u3059\uff01<\/p>\n
C \/ C++\u3067execvp()\u3092\u4f7f\u7528\u3059\u308b\u65b9\u6cd5\u3068\u305d\u306e\u4f8b – \u3044\u304f\u3064\u304b\u306e\u4f8b<\/h2>\n
\u3082\u3057\u3001fork()\u3092\u4f7f\u308f\u305a\u306b\u65b0\u3057\u3044\u30d7\u30ed\u30bb\u30b9\u3092\u751f\u6210\u305b\u305a\u306bexecvp()\u3092\u4f7f\u7528\u3057\u305f\u5834\u5408\u306b\u8d77\u3053\u308b\u5177\u4f53\u7684\u306a\u52d5\u4f5c\u3092\u78ba\u8a8d\u3057\u305f\u3044\u306e\u3067\u3042\u308c\u3070\u3001\u4ee5\u4e0b\u306e\u30d7\u30ed\u30b0\u30e9\u30e0\u304c\u305d\u308c\u3092\u793a\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n
\u79c1\u305f\u3061\u306fC\u30d7\u30ed\u30b0\u30e9\u30e0\u304b\u3089\u300cls -l\u300d\u3092\u5b9f\u884c\u3057\u307e\u3059\u3002<\/p>\n
execvp()\u306e\u5f8c\u306eprintf()\u30b9\u30c6\u30fc\u30c8\u30e1\u30f3\u30c8\u306f\u5b9f\u884c\u3055\u308c\u306a\u3044\u3053\u3068\u306b\u6ce8\u610f\u3057\u3066\u304f\u3060\u3055\u3044\u3002\u306a\u305c\u306a\u3089\u3001\u4ed6\u306e\u30d7\u30ed\u30bb\u30b9\u304c\u5236\u5fa1\u3092\u53d6\u3063\u3066\u3044\u308b\u304b\u3089\u3067\u3059\u3002<\/p>\n
#<\/span>include<\/span> <stdio.h><\/span><\/span>\r\n#<\/span>include<\/span> <unistd.h><\/span><\/span>\r\n\r\nint<\/span> main<\/span>(<\/span>)<\/span> {<\/span>\r\n    char<\/span>*<\/span> command =<\/span> \"ls\"<\/span>;<\/span>\r\n    char<\/span>*<\/span> argument_list[<\/span>]<\/span> =<\/span> {<\/span>\"ls\"<\/span>,<\/span> \"-l\"<\/span>,<\/span> NULL<\/span>}<\/span>;<\/span>\r\n\r\n    printf<\/span>(<\/span>\"Before calling execvp()\\n\"<\/span>)<\/span>;<\/span>\r\n\r\n    \/\/ Calling the execvp() system call<\/span>\r\n    int<\/span> status_code =<\/span> execvp<\/span>(<\/span>command,<\/span> argument_list)<\/span>;<\/span>\r\n\r\n    if<\/span> (<\/span>status_code ==<\/span> -<\/span>1<\/span>)<\/span> {<\/span>\r\n        printf<\/span>(<\/span>\"Process did not terminate correctly\\n\"<\/span>)<\/span>;<\/span>\r\n        exit<\/span>(<\/span>1<\/span>)<\/span>;<\/span>\r\n    }<\/span>\r\n\r\n    printf<\/span>(<\/span>\"This line will not be printed if execvp() runs correctly\\n\"<\/span>)<\/span>;<\/span>\r\n\r\n    return<\/span> 0<\/span>;<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\u51fa\u529b<\/p>\n
Before calling execvp(<\/span>)<\/span>\r\ntotal 3<\/span>\r\n-rwxrwxrwx<\/span> 1<\/span> user user 22088<\/span> May 30<\/span> 16<\/span>:37 a.out\r\n-rwxrwxrwx<\/span> 1<\/span> user user 16760<\/span> May 30<\/span> 16<\/span>:37 sample\r\n-rw-rw-rw- 1<\/span> user user  1020<\/span> May 30<\/span> 16<\/span>:37 sample.c\r\n<\/code><\/pre>\n
\u3054\u89a7\u306e\u901a\u308a\u3001execvp()\u306e\u5f8c\u306e\u90e8\u5206\u306f\u307e\u3063\u305f\u304f\u5b9f\u884c\u3055\u308c\u307e\u305b\u3093\u3002\u306a\u305c\u306a\u3089\u3001”ls -l”\u304c\u30d7\u30ed\u30bb\u30b9\u3092\u5236\u5fa1\u3057\u3066\u3044\u308b\u304b\u3089\u3067\u3059\uff01<\/p>\n
\u540c\u3058\u4f8b\u3092\u66f8\u304d\u63db\u3048\u3066\u307f\u307e\u3057\u3087\u3046\u304c\u3001fork()\u3092\u4f7f\u7528\u3057\u3066execvp() \u30b7\u30b9\u30c6\u30e0\u30b3\u30fc\u30eb\u3092\u5225\u306e\u30d7\u30ed\u30bb\u30b9\u3067\u5b9f\u884c\u3059\u308b\u3088\u3046\u306b\u3057\u307e\u3057\u3087\u3046\u3002<\/p>\n
\u4eca\u3001\u4f55\u304c\u8d77\u3053\u308b\u304b\u898b\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n
#<\/span>include<\/span> <stdio.h><\/span><\/span>\r\n#<\/span>include<\/span> <unistd.h><\/span><\/span>\r\n\r\nint<\/span> main<\/span>(<\/span>)<\/span> {<\/span>\r\n    char<\/span>*<\/span> command =<\/span> \"ls\"<\/span>;<\/span>\r\n    char<\/span>*<\/span> argument_list[<\/span>]<\/span> =<\/span> {<\/span>\"ls\"<\/span>,<\/span> \"-l\"<\/span>,<\/span> NULL<\/span>}<\/span>;<\/span>\r\n\r\n    printf<\/span>(<\/span>\"Before calling execvp()\\n\"<\/span>)<\/span>;<\/span>\r\n\r\n    printf<\/span>(<\/span>\"Creating another process using fork()...\\n\"<\/span>)<\/span>;<\/span>\r\n\r\n    if<\/span> (<\/span>fork<\/span>(<\/span>)<\/span> ==<\/span> 0<\/span>)<\/span> {<\/span>\r\n        \/\/ Newly spawned child Process. This will be taken over by \"ls -l\"<\/span>\r\n        int<\/span> status_code =<\/span> execvp<\/span>(<\/span>command,<\/span> argument_list)<\/span>;<\/span>\r\n\r\n        printf<\/span>(<\/span>\"ls -l has taken control of this child process. This won't execute unless it terminates abnormally!\\n\"<\/span>)<\/span>;<\/span>\r\n\r\n        if<\/span> (<\/span>status_code ==<\/span> -<\/span>1<\/span>)<\/span> {<\/span>\r\n            printf<\/span>(<\/span>\"Terminated Incorrectly\\n\"<\/span>)<\/span>;<\/span>\r\n            return<\/span> 1<\/span>;<\/span>\r\n        }<\/span>\r\n    }<\/span>\r\n    else<\/span> {<\/span>\r\n        \/\/ Old Parent process. The C program will come here<\/span>\r\n        printf<\/span>(<\/span>\"This line will be printed\\n\"<\/span>)<\/span>;<\/span>\r\n    }<\/span>\r\n\r\n    return<\/span> 0<\/span>;<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\u51fa\u529b<\/p>\n
Before calling execvp(<\/span>)<\/span>\r\nCreating another process using fork(<\/span>)<\/span>..<\/span>.\r\nThis line will be printed\r\nuser@shell:$ total 3<\/span>\r\n-rwxrwxrwx<\/span> 1<\/span> user user 22088<\/span> May 30<\/span> 16<\/span>:37 a.out\r\n-rwxrwxrwx<\/span> 1<\/span> user user 16760<\/span> May 30<\/span> 16<\/span>:37 sample\r\n-rw-rw-rw- 1<\/span> user user  1020<\/span> May 30<\/span> 16<\/span>:37 sample.c\r\n<\/code><\/pre>\n
\u3082\u3057\u30b7\u30a7\u30eb\u4e0a\u3067\u3042\u308c\u3070\u3001\u51fa\u529b\u304c\u5947\u5999\u306b\u898b\u3048\u308b\u304b\u3082\u3057\u308c\u307e\u305b\u3093\u304c\u3001\u305d\u308c\u306f\u8907\u6570\u306e\u30d7\u30ed\u30bb\u30b9\u304c\u4e26\u884c\u3057\u3066\u5b9f\u884c\u3055\u308c\u305f\u305f\u3081\u3067\u3059\uff01\u4e21\u65b9\u306e\u51fa\u529b\u304c\u78ba\u304b\u306b\u5370\u5237\u3055\u308c\u305f\u305f\u3081\u3001\u79c1\u305f\u3061\u306f\u554f\u984c\u3092\u89e3\u6c7a\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3057\u305f\u3002<\/p>\n
\n
\u7d50\u8ad6<\/h2>\n
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\u3053\u306e\u305f\u3081\u3001\u79c1\u305f\u3061\u306ffork\uff08\uff09\u30b7\u30b9\u30c6\u30e0\u30b3\u30fc\u30eb\u3092\u4f7f\u7528\u3057\u3066\u3001\u3053\u308c\u3092\u5225\u306e\u30d7\u30ed\u30bb\u30b9\u306e\u4e0b\u306b\u9589\u3058\u8fbc\u3081\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002\u304a\u305d\u3089\u304f\u3001\u3053\u308c\u306f\u3042\u306a\u305f\u306b\u306f\u7406\u89e3\u3067\u304d\u3066\u3001\u4ed6\u306e\u30d7\u30ed\u30b0\u30e9\u30e0\u3092\u5b9f\u884c\u3057\u306a\u304c\u3089\u3082C\u30d7\u30ed\u30b0\u30e9\u30e0\u3092\u5236\u5fa1\u3067\u304d\u308b\u3088\u3046\u306b\u306a\u308a\u307e\u3059\uff01<\/p>\n
\u53c2\u8003\u6587\u732e\u3092\u65e5\u672c\u8a9e\u3067\u81ea\u7136\u306b\u8a00\u3044\u63db\u3048\u3066\u304f\u3060\u3055\u3044\u3002<\/h2>\n
    \n
  • Linux manual page on the execvp() function in C<\/li>\n<\/ul>\n
    \n","protected":false},"excerpt":{"rendered":"
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