{"id":3433,"date":"2017-07-21T20:26:12","date_gmt":"2017-07-21T12:26:12","guid":{"rendered":"https:\/\/ixyzero.com\/blog\/?p=3433"},"modified":"2017-07-21T20:26:12","modified_gmt":"2017-07-21T12:26:12","slug":"linux%e4%b8%8b%e7%9a%84c%e8%af%ad%e8%a8%80%e5%ae%9e%e7%8e%b0%e5%b0%86%e6%96%87%e4%bb%b6%e5%86%85%e5%ae%b9%e8%af%bb%e5%85%a5%e6%95%b0%e7%bb%84","status":"publish","type":"post","link":"https:\/\/ixyzero.com\/blog\/archives\/3433.html","title":{"rendered":"Linux\u4e0b\u7684C\u8bed\u8a00\u5b9e\u73b0#\u5c06\u6587\u4ef6\u5185\u5bb9\u8bfb\u5165\u6570\u7ec4"},"content":{"rendered":"

=Start=<\/p>\n

\u7f18\u7531\uff1a<\/h4>\n

\u8981\u5b9e\u73b0\u4e00\u4e2adaemon\u7a0b\u5e8f\uff0c\u63d0\u4f9b\u7c7b\u4f3cNginx\u7684reload\u529f\u80fd\uff08\u5373\uff0c\u5bf9\u5176\u53d1\u9001USR1\u4fe1\u53f7\uff0c\u5b83\u4f1a\u81ea\u52a8\u91cd\u65b0\u52a0\u8f7d\u914d\u7f6e\u6587\u4ef6\u5e76\u5b9e\u65f6\u751f\u6548\uff09\uff0c\u4fe1\u53f7\u5904\u7406\u90e8\u5206\u5df2\u7ecf\u77e5\u9053\u8be5\u5982\u4f55\u5904\u7406\u4e86\uff0c\u73b0\u5728\u5c31\u662f\u5728\u63a5\u6536\u5230\u4fe1\u53f7\u540e\u53bb\u8bfb\u53d6\u6587\u4ef6\u5185\u5bb9\u5e76\u66f4\u65b0\u5168\u5c40\u53d8\u91cf\u4f7f\u5373\u65f6\u751f\u6548\u3002<\/p>\n

\u6b63\u6587\uff1a<\/h4>\n

\u53c2\u8003\u89e3\u7b54\uff1a<\/h5>\n

\u521d\u59cb\u4ee3\u7801\u662f\u8fd9\u6837\u7684\uff1a<\/p>\n

\n
\n
\n
\n\n\n\n
\n
\n
int<\/code>\u00a0pid_list[<\/code>16<\/code>] = { [\u00a0<\/code>0<\/code>\u00a0...\u00a0<\/code>15<\/code>\u00a0] = -<\/code>1<\/code>\u00a0};<\/code><\/div>\n
<\/div>\n
int<\/code>\u00a0usr1_reload() {<\/code><\/div>\n
\u00a0\u00a0\u00a0<\/code>FILE *fp;<\/code><\/div>\n
\u00a0\u00a0\u00a0<\/code>fp = fopen(<\/code>\"\/tmp\/pmon.txt\"<\/code>,\u00a0<\/code>\"r\"<\/code>);<\/code><\/div>\n
\u00a0\u00a0\u00a0<\/code>if<\/code>\u00a0(fp == NULL) {<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/code>perror(<\/code>\"fopen\"<\/code>);<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/code>return<\/code>\u00a0-<\/code>1<\/code>;<\/code><\/div>\n
\u00a0\u00a0\u00a0<\/code>}<\/code><\/div>\n
<\/div>\n
\u00a0\u00a0\u00a0<\/code>char<\/code>\u00a0*line = NULL;<\/code><\/div>\n
\u00a0\u00a0\u00a0<\/code>size_t len =\u00a0<\/code>0<\/code>;<\/code><\/div>\n
\u00a0\u00a0\u00a0<\/code>ssize_t nread;<\/code><\/div>\n
\u00a0\u00a0\u00a0<\/code>int<\/code>\u00a0i =\u00a0<\/code>0<\/code>;<\/code><\/div>\n
\u00a0\u00a0\u00a0<\/code>while<\/code>\u00a0(((nread = getline(&line, &len, fp)) != -<\/code>1<\/code>) && i <\u00a0<\/code>16<\/code>) {<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/code>pid_list[i++] = atoi(line);\u00a0<\/code>\/\/atoi()\u5728\u5bf9\u4e00\u4e2a\u975e\u6570\u5b57\u5b57\u7b26\u4e32\u8fdb\u884c\u8f6c\u6362\u65f6\u53ea\u4f1a\u8fd4\u56de0\uff0c\u4f46\u6ca1\u6709\u9519\u8bef\u4fe1\u606f\uff0c\u6240\u4ee5\u4e0d\u63a8\u8350\u4f7f\u7528<\/code><\/div>\n
\u00a0\u00a0\u00a0<\/code>}<\/code><\/div>\n
<\/div>\n
\u00a0\u00a0\u00a0<\/code>if<\/code>(line)<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/code>free(line);<\/code><\/div>\n
\u00a0\u00a0\u00a0<\/code>fclose(fp);<\/code><\/div>\n
\u00a0\u00a0\u00a0<\/code>return<\/code>\u00a00<\/code>;<\/code><\/div>\n
}<\/code><\/div>\n<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n

&<\/p>\n

{\r\n    \/* some code here *\/\r\n    char *line = NULL, *index = NULL;\r\n    char pid_str[1024] = {0}, *pid_str_p, *token = NULL, delim[] = \", \";\r\n    size_t len = 0;\r\n    ssize_t nread;\r\n    int i = 0, pid;\r\n    while ((nread = getline(&line, &len, fp)) != -1) {\r\n        if (strncmp(line, \"pid\", 3) == 0) {\r\n            index = strchr(line, '=');\r\n            if (index) {\r\n                strncpy(pid_str, index+1, nread-6);\r\n                pid_str_p = pid_str;\r\n                token = strsep(&pid_str_p, delim);\r\n                while(token != NULL){\r\n                    if (token[0] != '\\0') {\r\n                      pid = (int) strtol(token, NULL, 10);\r\n                      if (pid <= 0 || pid == (int)LONG_MIN || pid == (int)LONG_MAX) {\r\n                      } else {\r\n                        if (i < MAX_PID_COUNT-1) {\r\n                          pid_list[i++] = pid;\r\n                        }\r\n                      }\r\n                    }\r\n                    token = strsep(&pid_str_p, delim);\r\n                }\r\n            }\r\n\r\n            break;\r\n        }\r\n    }\r\n    \/* some code here *\/\r\n}<\/pre>\n
 <\/p>\n
\u53c2\u8003\u94fe\u63a5\uff1a<\/h5>\n
C\u8bed\u8a00\u4e2d\u6570\u7ec4\u5143\u7d20\u7684\u521d\u59cb\u5316<\/strong>
\nhttps:\/\/stackoverflow.com\/questions\/201101\/how-to-initialize-all-members-of-an-array-to-the-same-value<\/a>
\nhttps:\/\/stackoverflow.com\/questions\/2589749\/how-to-initialize-array-to-0-in-c<\/a><\/p>\n
Linux\u4e0bC\u8bed\u8a00\u4e2d\u6574\u578b\u6570\u7684\u8303\u56f4
\nlinux c integer range
\nhttps:\/\/stackoverflow.com\/questions\/6155784\/range-of-values-in-c-int-and-long-32-64-bits<\/a>
\nhttps:\/\/stackoverflow.com\/questions\/11438794\/is-the-size-of-c-int-2-bytes-or-4-bytes<\/a><\/p>\n
Linux\u4e0bC\u8bed\u8a00\u4e2d\u7684 atoi() \u548c strtol()<\/strong><\/span>
\nlinux c atoi error string
\nhttps:\/\/stackoverflow.com\/questions\/2024648\/convert-a-string-to-int-but-only-if-really-is-an-int<\/a>
\nhttp:\/\/man7.org\/linux\/man-pages\/man3\/strtol.3.html<\/a>
\nhttps:\/\/stackoverflow.com\/questions\/8871711\/atoi-how-to-identify-the-difference-between-zero-and-error<\/a>
\nhttps:\/\/stackoverflow.com\/questions\/2729460\/why-do-i-get-this-unexpected-result-using-atoi-in-c<\/a><\/p>\n
=END=<\/p>\n","protected":false},"excerpt":{"rendered":"
=Start= \u7f18\u7531\uff1a \u8981\u5b9e\u73b0\u4e00\u4e2adaemon\u7a0b\u5e8f\uff0c\u63d0\u4f9b\u7c7b\u4f3cNginx\u7684reload\u529f\u80fd\uff08\u5373\uff0c\u5bf9\u5176\u53d1\u9001USR1 […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[11,7],"tags":[864,100,842,30,861],"class_list":["post-3433","post","type-post","status-publish","format-standard","hentry","category-linux","category-programing","tag-atoi","tag-c","tag-getline","tag-linux","tag-strtol"],"views":2674,"_links":{"self":[{"href":"https:\/\/ixyzero.com\/blog\/wp-json\/wp\/v2\/posts\/3433","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/ixyzero.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/ixyzero.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/ixyzero.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/ixyzero.com\/blog\/wp-json\/wp\/v2\/comments?post=3433"}],"version-history":[{"count":1,"href":"https:\/\/ixyzero.com\/blog\/wp-json\/wp\/v2\/posts\/3433\/revisions"}],"predecessor-version":[{"id":3434,"href":"https:\/\/ixyzero.com\/blog\/wp-json\/wp\/v2\/posts\/3433\/revisions\/3434"}],"wp:attachment":[{"href":"https:\/\/ixyzero.com\/blog\/wp-json\/wp\/v2\/media?parent=3433"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/ixyzero.com\/blog\/wp-json\/wp\/v2\/categories?post=3433"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/ixyzero.com\/blog\/wp-json\/wp\/v2\/tags?post=3433"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}