{"id":1978,"date":"2018-10-26T11:42:42","date_gmt":"2018-10-26T03:42:42","guid":{"rendered":"https:\/\/damogame.cn:15443\/wordpress\/?p=1978"},"modified":"2018-10-26T11:42:42","modified_gmt":"2018-10-26T03:42:42","slug":"linux%e8%bf%9b%e7%a8%8b%e9%97%b4%e9%80%9a%e4%bf%a1%e6%ba%90%e7%a0%81%e5%89%96%e6%9e%90%ef%bc%8c%e5%85%b1%e4%ba%ab%e5%86%85%e5%ad%98shmget%e5%87%bd%e6%95%b0%e8%af%a6%e8%a7%a3","status":"publish","type":"post","link":"https:\/\/i007.cc\/wordpress\/archives\/1978","title":{"rendered":"Linux\u8fdb\u7a0b\u95f4\u901a\u4fe1\u6e90\u7801\u5256\u6790\uff0c\u5171\u4eab\u5185\u5b58(shmget\u51fd\u6570\u8be6\u89e3)"},"content":{"rendered":"<div class=\"article-header-box\">\n<div class=\"article-header\">\n<div class=\"article-title-box\"><\/div>\n<\/div>\n<\/div>\n<article>\n<div id=\"article_content\" class=\"article_content clearfix csdn-tracking-statistics\" data-pid=\"blog\" data-mod=\"popu_307\" data-dsm=\"post\">\n<div class=\"htmledit_views\">\n<p><strong>shmget<\/strong><\/p>\n<ul>\n<li>int shmget(key_t<span class=\"Apple-converted-space\">\u00a0<\/span><span class=\"docEmphItalicAlt\">key<\/span>, size_t<span class=\"Apple-converted-space\">\u00a0<\/span><span class=\"docEmphItalicAlt\">size<\/span>, int<span class=\"Apple-converted-space\">\u00a0<\/span><span class=\"docEmphItalicAlt\">flag<\/span>);<\/li>\n<li>key: \u6807\u8bc6\u7b26\u7684\u89c4\u5219<\/li>\n<li>size:\u5171\u4eab\u5b58\u50a8\u6bb5\u7684\u5b57\u8282\u6570<\/li>\n<li>flag:\u8bfb\u5199\u7684\u6743\u9650<\/li>\n<li>\u8fd4\u56de\u503c\uff1a\u6210\u529f\u8fd4\u56de\u5171\u4eab\u5b58\u50a8\u7684id\uff0c\u5931\u8d25\u8fd4\u56de-1<\/li>\n<\/ul>\n<div><\/div>\n<div><span class=\"Apple-style-span\"><strong>key_t key<\/strong><br \/>\n&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8211;<br \/>\nkey\u6807\u8bc6\u5171\u4eab\u5185\u5b58\u7684\u952e\u503c:<span class=\"Apple-converted-space\">\u00a0<\/span><strong>0\/IPC_PRIVATE<\/strong>\u3002 \u5f53key\u7684\u53d6\u503c\u4e3aIPC_PRIVATE\uff0c\u5219\u51fd\u6570shmget()\u5c06\u521b\u5efa\u4e00\u5757\u65b0\u7684\u5171\u4eab\u5185\u5b58\uff1b\u5982\u679ckey\u7684\u53d6\u503c\u4e3a0\uff0c\u800c\u53c2\u6570shmflg\u4e2d\u8bbe\u7f6e\u4e86IPC_PRIVATE\u8fd9\u4e2a\u6807\u5fd7\uff0c\u5219\u540c\u6837\u5c06\u521b\u5efa\u4e00\u5757\u65b0\u7684\u5171\u4eab\u5185\u5b58\u3002<br \/>\n\u5728IPC\u7684\u901a\u4fe1\u6a21\u5f0f\u4e0b\uff0c\u4e0d\u7ba1\u662f\u4f7f\u7528\u6d88\u606f\u961f\u5217\u8fd8\u662f\u5171\u4eab\u5185\u5b58\uff0c\u751a\u81f3\u662f\u4fe1\u53f7\u91cf\uff0c\u6bcf\u4e2aIPC\u7684\u5bf9\u8c61(object)\u90fd\u6709\u552f\u4e00\u7684\u540d\u5b57\uff0c\u79f0\u4e3a\u201c\u952e\u201d(key)\u3002\u901a\u8fc7\u201c\u952e\u201d\uff0c\u8fdb\u7a0b\u80fd\u591f\u8bc6\u522b\u6240\u7528\u7684\u5bf9\u8c61\u3002\u201c\u952e\u201d\u4e0eIPC\u5bf9\u8c61\u7684\u5173\u7cfb\u5c31\u5982\u540c\u6587\u4ef6\u540d\u79f0\u4e4b\u4e8e\u6587\u4ef6\uff0c\u901a\u8fc7\u6587\u4ef6\u540d\uff0c\u8fdb\u7a0b\u80fd\u591f\u8bfb\u5199\u6587\u4ef6\u5185\u7684\u6570\u636e\uff0c\u751a\u81f3\u591a\u4e2a\u8fdb\u7a0b\u80fd\u591f\u5171\u7528\u4e00\u4e2a\u6587\u4ef6\u3002\u800c\u5728IPC\u7684\u901a\u8baf\u6a21\u5f0f\u4e0b\uff0c\u901a\u8fc7\u201c\u952e\u201d\u7684\u4f7f\u7528\u4e5f\u4f7f\u5f97\u4e00\u4e2aIPC\u5bf9\u8c61\u80fd\u4e3a\u591a\u4e2a\u8fdb\u7a0b\u6240\u5171\u7528\u3002<br \/>\nLinux\u7cfb\u7edf\u4e2d\u7684\u6240\u6709\u8868\u793aSystem V\u4e2dIPC\u5bf9\u8c61\u7684\u6570\u636e\u7ed3\u6784\u90fd\u5305\u62ec\u4e00\u4e2aipc_perm\u7ed3\u6784\uff0c\u5176\u4e2d\u5305\u542b\u6709IPC\u5bf9\u8c61\u7684\u952e\u503c\uff0c\u8be5\u952e\u7528\u4e8e\u67e5\u627eSystem V\u4e2dIPC\u5bf9\u8c61\u7684\u5f15\u7528\u6807\u8bc6\u7b26\u3002\u5982\u679c\u4e0d\u4f7f\u7528\u201c\u952e\u201d\uff0c\u8fdb\u7a0b\u5c06\u65e0\u6cd5\u5b58\u53d6IPC\u5bf9\u8c61\uff0c\u56e0\u4e3aIPC\u5bf9\u8c61\u5e76\u4e0d\u5b58\u5728\u4e8e\u8fdb\u7a0b\u672c\u8eab\u4f7f\u7528\u7684\u5185\u5b58\u4e2d\u3002<br \/>\n\u901a\u5e38\uff0c\u90fd\u5e0c\u671b\u81ea\u5df1\u7684\u7a0b\u5e8f\u80fd\u548c\u5176\u4ed6\u7684\u7a0b\u5e8f\u9884\u5148\u7ea6\u5b9a\u4e00\u4e2a\u552f\u4e00\u7684\u952e\u503c\uff0c\u4f46\u5b9e\u9645\u4e0a\u5e76\u4e0d\u662f\u603b\u53ef\u80fd\u7684\u6210\u884c\u7684\uff0c\u56e0\u4e3a\u81ea\u5df1\u7684\u7a0b\u5e8f\u65e0\u6cd5\u4e3a\u4e00\u5757\u5171\u4eab\u5185\u5b58\u9009\u62e9\u4e00\u4e2a\u952e\u503c\u3002\u56e0\u6b64\uff0c\u5728\u6b64\u628akey\u8bbe\u4e3aIPC_PRIVATE\uff0c\u8fd9\u6837\uff0c\u64cd\u4f5c\u7cfb\u7edf\u5c06\u5ffd\u7565\u952e\uff0c\u5efa\u7acb\u4e00\u4e2a\u65b0\u7684\u5171\u4eab\u5185\u5b58\uff0c\u6307\u5b9a\u4e00\u4e2a\u952e\u503c\uff0c\u7136\u540e\u8fd4\u56de\u8fd9\u5757\u5171\u4eab\u5185\u5b58IPC\u6807\u8bc6\u7b26ID\u3002\u800c\u5c06\u8fd9\u4e2a\u65b0\u7684\u5171\u4eab\u5185\u5b58\u7684\u6807\u8bc6\u7b26ID\u544a\u8bc9\u5176\u4ed6\u8fdb\u7a0b\u53ef\u4ee5\u5728\u5efa\u7acb\u5171\u4eab\u5185\u5b58\u540e\u901a\u8fc7\u6d3e\u751f\u5b50\u8fdb\u7a0b\uff0c\u6216\u5199\u5165\u6587\u4ef6\u6216\u7ba1\u9053\u6765\u5b9e\u73b0\u3002<\/p>\n<p><strong>int size(\u5355\u4f4d\u5b57\u8282Byte)<\/strong><br \/>\n&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8211;<br \/>\nsize\u662f\u8981\u5efa\u7acb\u5171\u4eab\u5185\u5b58\u7684\u957f\u5ea6\u3002\u6240\u6709\u7684\u5185\u5b58\u5206\u914d\u64cd\u4f5c\u90fd\u662f\u4ee5\u9875\u4e3a\u5355\u4f4d\u7684\u3002\u6240\u4ee5\u5982\u679c\u4e00\u6bb5\u8fdb\u7a0b\u53ea\u7533\u8bf7\u4e00\u5757\u53ea\u6709\u4e00\u4e2a\u5b57\u8282\u7684\u5185\u5b58\uff0c\u5185\u5b58\u4e5f\u4f1a\u5206\u914d\u6574\u6574\u4e00\u9875(\u5728i386\u673a\u5668\u4e2d\u4e00\u9875\u7684\u7f3a\u7701\u5927\u5c0fPACE_SIZE=4096\u5b57\u8282)\u8fd9\u6837\uff0c\u65b0\u521b\u5efa\u7684\u5171\u4eab\u5185\u5b58\u7684\u5927\u5c0f\u5b9e\u9645\u4e0a\u662f\u4ecesize\u8fd9\u4e2a\u53c2\u6570\u8c03\u6574\u800c\u6765\u7684\u9875\u9762\u5927\u5c0f\u3002\u5373\u5982\u679csize\u4e3a1\u81f34096\uff0c\u5219\u5b9e\u9645\u7533\u8bf7\u5230\u7684\u5171\u4eab\u5185\u5b58\u5927\u5c0f\u4e3a4K(\u4e00\u9875)\uff1b4097\u52308192\uff0c\u5219\u5b9e\u9645\u7533\u8bf7\u5230\u7684\u5171\u4eab\u5185\u5b58\u5927\u5c0f\u4e3a8K(\u4e24\u9875)\uff0c\u4f9d\u6b64\u7c7b\u63a8\u3002<\/p>\n<p><strong>int shmflg<\/strong><br \/>\n&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8211;<br \/>\nshmflg\u4e3b\u8981\u548c\u4e00\u4e9b\u6807\u5fd7\u6709\u5173\u3002\u5176\u4e2d\u6709\u6548\u7684\u5305\u62ecIPC_CREAT\u548cIPC_EXCL\uff0c\u5b83\u4eec\u7684\u529f\u80fd\u4e0eopen()\u7684O_CREAT\u548cO_EXCL\u76f8\u5f53\u3002<br \/>\nIPC_CREAT\u00a0\u00a0 \u5982\u679c\u5171\u4eab\u5185\u5b58\u4e0d\u5b58\u5728\uff0c\u5219\u521b\u5efa\u4e00\u4e2a\u5171\u4eab\u5185\u5b58\uff0c\u5426\u5219\u6253\u5f00\u64cd\u4f5c\u3002<br \/>\nIPC_EXCL\u00a0\u00a0\u00a0 \u53ea\u6709\u5728\u5171\u4eab\u5185\u5b58\u4e0d\u5b58\u5728\u7684\u65f6\u5019\uff0c\u65b0\u7684\u5171\u4eab\u5185\u5b58\u624d\u5efa\u7acb\uff0c\u5426\u5219\u5c31\u4ea7\u751f\u9519\u8bef\u3002<\/p>\n<p>\u5982\u679c\u5355\u72ec\u4f7f\u7528IPC_CREAT\uff0cshmget()\u51fd\u6570\u8981\u4e48\u8fd4\u56de\u4e00\u4e2a\u5df2\u7ecf\u5b58\u5728\u7684\u5171\u4eab\u5185\u5b58\u7684\u64cd\u4f5c\u7b26\uff0c\u8981\u4e48\u8fd4\u56de\u4e00\u4e2a\u65b0\u5efa\u7684\u5171\u4eab\u5185\u5b58\u7684\u6807\u8bc6\u7b26\u3002\u5982\u679c\u5c06IPC_CREAT\u548cIPC_EXCL\u6807\u5fd7\u4e00\u8d77\u4f7f\u7528\uff0cshmget()\u5c06\u8fd4\u56de\u4e00\u4e2a\u65b0\u5efa\u7684\u5171\u4eab\u5185\u5b58\u7684\u6807\u8bc6\u7b26\uff1b\u5982\u679c\u8be5\u5171\u4eab\u5185\u5b58\u5df2\u5b58\u5728\uff0c\u6216\u8005\u8fd4\u56de-1\u3002IPC_EXEL\u6807\u5fd7\u672c\u8eab\u5e76\u6ca1\u6709\u592a\u5927\u7684\u610f\u4e49\uff0c\u4f46\u662f\u548cIPC_CREAT\u6807\u5fd7\u4e00\u8d77\u4f7f\u7528\u53ef\u4ee5\u7528\u6765\u4fdd\u8bc1\u6240\u5f97\u7684\u5bf9\u8c61\u662f\u65b0\u5efa\u7684\uff0c\u800c\u4e0d\u662f\u6253\u5f00\u5df2\u6709\u7684\u5bf9\u8c61\u3002\u5bf9\u4e8e\u7528\u6237\u7684\u8bfb\u53d6\u548c\u5199\u5165\u8bb8\u53ef\u6307\u5b9a<strong>SHM_R<\/strong>\u548c<strong>SHM_W<\/strong>,(SHM_R&gt;3)\u548c(SHM_W&gt;3)\u662f\u4e00\u7ec4\u8bfb\u53d6\u548c\u5199\u5165\u8bb8\u53ef\uff0c\u800c(SHM_R&gt;6)\u548c(SHM_W&gt;6)\u662f\u5168\u5c40\u8bfb\u53d6\u548c\u5199\u5165\u8bb8\u53ef\u3002<\/p>\n<p><strong>\u8fd4\u56de\u503c<\/strong><br \/>\n&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8211;<br \/>\n\u6210\u529f\u8fd4\u56de\u5171\u4eab\u5185\u5b58\u7684\u6807\u8bc6\u7b26\uff1b\u4e0d\u6210\u529f\u8fd4\u56de-1\uff0cerrno\u50a8\u5b58\u9519\u8bef\u539f\u56e0\u3002<br \/>\nEINVAL\u00a0\u00a0\u00a0 \u00a0\u00a0\u00a0 \u53c2\u6570size\u5c0f\u4e8eSHMMIN\u6216\u5927\u4e8eSHMMAX\u3002<br \/>\nEEXIST\u00a0\u00a0\u00a0 \u00a0\u00a0\u00a0 \u9884\u5efa\u7acbkey\u6240\u81f4\u7684\u5171\u4eab\u5185\u5b58\uff0c\u4f46\u5df2\u7ecf\u5b58\u5728\u3002<br \/>\nEIDRM\u00a0\u00a0\u00a0 \u00a0\u00a0\u00a0\u00a0 \u53c2\u6570key\u6240\u81f4\u7684\u5171\u4eab\u5185\u5b58\u5df2\u7ecf\u5220\u9664\u3002<br \/>\nENOSPC\u00a0\u00a0\u00a0 \u00a0\u00a0\u00a0 \u8d85\u8fc7\u4e86\u7cfb\u7edf\u5141\u8bb8\u5efa\u7acb\u7684\u5171\u4eab\u5185\u5b58\u7684\u6700\u5927\u503c(SHMALL )\u3002<br \/>\nENOENT\u00a0\u00a0\u00a0 \u00a0\u00a0\u00a0 \u53c2\u6570key\u6240\u6307\u7684\u5171\u4eab\u5185\u5b58\u4e0d\u5b58\u5728\uff0c\u53c2\u6570shmflg\u4e5f\u672a\u8bbeIPC_CREAT\u4f4d\u3002<br \/>\nEACCES\u00a0\u00a0\u00a0 \u00a0\u00a0\u00a0 \u6ca1\u6709\u6743\u9650\u3002<br \/>\nENOMEM\u00a0\u00a0\u00a0 \u00a0\u00a0\u00a0 \u6838\u5fc3\u5185\u5b58\u4e0d\u8db3\u3002<\/p>\n<p><strong>struct shmid_ds<\/strong><br \/>\n&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8211;<br \/>\nshmid_ds\u6570\u636e\u7ed3\u6784\u8868\u793a\u6bcf\u4e2a\u65b0\u5efa\u7684\u5171\u4eab\u5185\u5b58\u3002\u5f53shmget()\u521b\u5efa\u4e86\u4e00\u5757\u65b0\u7684\u5171\u4eab\u5185\u5b58\u540e\uff0c\u8fd4\u56de\u4e00\u4e2a\u53ef\u4ee5\u7528\u4e8e\u5f15\u7528\u8be5\u5171\u4eab\u5185\u5b58\u7684shmid_ds\u6570\u636e\u7ed3\u6784\u7684\u6807\u8bc6\u7b26\u3002<\/p>\n<p>include\/linux\/shm.h<\/p>\n<p>struct shmid_ds {<span class=\"Apple-converted-space\">\u00a0<\/span><br \/>\nstruct ipc_perm\u00a0\u00a0\u00a0 shm_perm;\u00a0\u00a0\u00a0\u00a0\u00a0 \/* operation perms *\/<span class=\"Apple-converted-space\">\u00a0<\/span><br \/>\nint\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 shm_segsz;\u00a0\u00a0\u00a0\u00a0 \/* size of segment (bytes) *\/<span class=\"Apple-converted-space\">\u00a0<\/span><br \/>\n__kernel_time_t\u00a0\u00a0\u00a0 shm_atime;\u00a0\u00a0\u00a0\u00a0 \/* last attach time *\/<span class=\"Apple-converted-space\">\u00a0<\/span><br \/>\n__kernel_time_t\u00a0\u00a0\u00a0 shm_dtime;\u00a0\u00a0\u00a0\u00a0 \/* last detach time *\/<span class=\"Apple-converted-space\">\u00a0<\/span><br \/>\n__kernel_time_t\u00a0\u00a0\u00a0 shm_ctime;\u00a0\u00a0\u00a0\u00a0 \/* last change time *\/<span class=\"Apple-converted-space\">\u00a0<\/span><br \/>\n__kernel_ipc_pid_t shm_cpid;\u00a0\u00a0\u00a0\u00a0\u00a0 \/* pid of creator *\/<span class=\"Apple-converted-space\">\u00a0<\/span><br \/>\n__kernel_ipc_pid_t shm_lpid;\u00a0\u00a0\u00a0\u00a0\u00a0 \/* pid of last operator *\/<span class=\"Apple-converted-space\">\u00a0<\/span><br \/>\nunsigned short\u00a0\u00a0\u00a0\u00a0 shm_nattch;\u00a0\u00a0\u00a0 \/* no. of current attaches *\/<span class=\"Apple-converted-space\">\u00a0<\/span><br \/>\nunsigned short\u00a0\u00a0\u00a0\u00a0 shm_unused;\u00a0\u00a0\u00a0 \/* compatibility *\/<span class=\"Apple-converted-space\">\u00a0<\/span><br \/>\nvoid\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 *shm_unused2; \/* ditto &#8211; used by DIPC *\/<span class=\"Apple-converted-space\">\u00a0<\/span><br \/>\nvoid\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 *shm_unused3; \/* unused *\/<span class=\"Apple-converted-space\">\u00a0<\/span><br \/>\n};<\/p>\n<p><strong>struct ipc_perm<\/strong><br \/>\n&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8211;<br \/>\n\u5bf9\u4e8e\u6bcf\u4e2aIPC\u5bf9\u8c61\uff0c\u7cfb\u7edf\u5171\u7528\u4e00\u4e2astruct ipc_perm\u7684\u6570\u636e\u7ed3\u6784\u6765\u5b58\u653e\u6743\u9650\u4fe1\u606f\uff0c\u4ee5\u786e\u5b9a\u4e00\u4e2aipc\u64cd\u4f5c\u662f\u5426\u53ef\u4ee5\u8bbf\u95ee\u8be5IPC\u5bf9\u8c61\u3002<\/p>\n<p>struct ipc_perm {<span class=\"Apple-converted-space\">\u00a0<\/span><br \/>\n__kernel_key_t\u00a0\u00a0 key;<span class=\"Apple-converted-space\">\u00a0<\/span><br \/>\n__kernel_uid_t\u00a0\u00a0 uid;<span class=\"Apple-converted-space\">\u00a0<\/span><br \/>\n__kernel_gid_t\u00a0\u00a0 gid;<span class=\"Apple-converted-space\">\u00a0<\/span><br \/>\n__kernel_uid_t\u00a0\u00a0 cuid;<span class=\"Apple-converted-space\">\u00a0<\/span><br \/>\n__kernel_gid_t\u00a0\u00a0 cgid;<span class=\"Apple-converted-space\">\u00a0<\/span><br \/>\n__kernel_mode_t mode;<span class=\"Apple-converted-space\">\u00a0<\/span><br \/>\nunsigned short\u00a0\u00a0 seq;<span class=\"Apple-converted-space\">\u00a0<\/span><br \/>\n};<\/span><\/div>\n<div><span class=\"Apple-style-span\">\/\/&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;-<\/span><\/div>\n<div><span class=\"Apple-style-span\">shmat<\/span><\/div>\n<div>void *shmat(int<span class=\"Apple-converted-space\">\u00a0<\/span><span class=\"docEmphItalicAlt\">shmid<\/span>, const void *<span class=\"docEmphItalicAlt\">addr<\/span>, int<span class=\"Apple-converted-space\">\u00a0<\/span><span class=\"docEmphItalicAlt\">flag<\/span>);<\/div>\n<div>shmid\uff1a\u5171\u4eab\u5b58\u50a8\u7684id<\/div>\n<div>addr\uff1a\u4e00\u822c\u4e3a0\uff0c\u8868\u793a\u8fde\u63a5\u5230\u7531\u5185\u6838\u9009\u62e9\u7684\u7b2c\u4e00\u4e2a\u53ef\u7528\u5730\u5740\u4e0a\uff0c\u5426\u5219\uff0c\u5982\u679cflag\u6ca1\u6709\u6307\u5b9aSHM_RND\uff0c\u5219\u8fde\u63a5\u5230addr\u6240\u6307\u5b9a\u7684\u5730\u5740\u4e0a\uff0c\u5982\u679cflag\u4e3aSHM_RND\uff0c\u5219\u5730\u5740\u53d6\u6574<\/div>\n<div>flag\uff1a\u5982\u524d\u6240\u8ff0\uff0c\u4e00\u822c\u4e3a0<\/div>\n<div>\u8fd4\u56de\u503c\uff1a\u5982\u679c\u6210\u529f\uff0c\u8fd4\u56de\u5171\u4eab\u5b58\u50a8\u6bb5\u5730\u5740\uff0c\u51fa\u9519\u8fd4\u56de-1<\/div>\n<div><span class=\"Apple-style-span\">shmdt<\/span><\/div>\n<div>int shmdt(void *addr);<\/div>\n<div>addr:\u5171\u4eab\u5b58\u50a8\u6bb5\u7684\u5730\u5740\uff0c\u4ee5\u524d\u8c03\u7528shmat\u65f6\u7684\u8fd4\u56de\u503c<\/div>\n<div>shmdt\u5c06\u4f7f\u76f8\u5173shmid_ds\u7ed3\u6784\u4e2d\u7684shm_nattch\u8ba1\u6570\u5668\u503c\u51cf1<\/div>\n<div><span class=\"Apple-style-span\">shmctl<\/span><\/div>\n<div>int shmctl(int shmid,int cmd,struct shmid_ds *buf)<\/div>\n<div>shmid:\u5171\u4eab\u5b58\u50a8\u6bb5\u7684id<\/div>\n<div>cmd\uff1a\u4e00\u4e9b\u547d\u4ee4\uff0c\u6709\uff1aIPC_STAT,IPC_RMID,SHM_LOCK,SHM_UNLOCK<\/div>\n<div><span class=\"Apple-style-span\">\u8bf7\u6ce8\u610f\uff0c\u5171\u4eab\u5185\u5b58\u4e0d\u4f1a\u968f\u7740\u7a0b\u5e8f\u7ed3\u675f\u800c\u81ea\u52a8\u6d88\u9664\uff0c\u8981\u4e48\u8c03\u7528shmctl\u5220\u9664\uff0c\u8981\u4e48\u81ea\u5df1\u7528\u624b\u6572\u547d\u4ee4\u53bb\u5220\u9664\uff0c\u5426\u5219\u6c38\u8fdc\u7559\u5728\u7cfb\u7edf\u4e2d\u3002<\/span><\/div>\n<\/div>\n<\/div>\n<\/article>\n","protected":false},"excerpt":{"rendered":"<p>shmget int shmget(ke<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"colormag_page_container_layout":"default_layout","colormag_page_sidebar_layout":"default_layout","footnotes":""},"categories":[],"tags":[119],"class_list":["post-1978","post","type-post","status-publish","format-standard","hentry","tag-03-"],"_links":{"self":[{"href":"https:\/\/i007.cc\/wordpress\/wp-json\/wp\/v2\/posts\/1978","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/i007.cc\/wordpress\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/i007.cc\/wordpress\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/i007.cc\/wordpress\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/i007.cc\/wordpress\/wp-json\/wp\/v2\/comments?post=1978"}],"version-history":[{"count":0,"href":"https:\/\/i007.cc\/wordpress\/wp-json\/wp\/v2\/posts\/1978\/revisions"}],"wp:attachment":[{"href":"https:\/\/i007.cc\/wordpress\/wp-json\/wp\/v2\/media?parent=1978"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/i007.cc\/wordpress\/wp-json\/wp\/v2\/categories?post=1978"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/i007.cc\/wordpress\/wp-json\/wp\/v2\/tags?post=1978"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}