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</a></li></ul></li></ul></div></div> <!----></nav>  <ul class="sidebar-links"><li><section class="sidebar-group depth-0"><p class="sidebar-heading open"><span>进程创建与进程间通信</span> <!----></p> <ul class="sidebar-links sidebar-group-items"><li><a href="/OS_lab_tutorial/Linux/Assignment/Lab2.html#本章导读" class="sidebar-link">本章导读</a><ul class="sidebar-sub-headers"></ul></li><li><a href="/OS_lab_tutorial/Linux/Assignment/Lab2.html#实验内容" class="sidebar-link">实验内容</a><ul class="sidebar-sub-headers"><li class="sidebar-sub-header"><a href="/OS_lab_tutorial/Linux/Assignment/Lab2.html#进程创建" class="sidebar-link">进程创建</a></li><li class="sidebar-sub-header"><a href="/OS_lab_tutorial/Linux/Assignment/Lab2.html#创建进程树" class="sidebar-link">创建进程树</a></li><li class="sidebar-sub-header"><a href="/OS_lab_tutorial/Linux/Assignment/Lab2.html#信号通信" class="sidebar-link">信号通信</a></li><li class="sidebar-sub-header"><a href="/OS_lab_tutorial/Linux/Assignment/Lab2.html#管道通信" class="sidebar-link">管道通信</a></li></ul></li></ul></section></li></ul> </aside> <main class="page"> <div class="theme-default-content content__default"><h1 id="进程创建与进程间通信"><a href="#进程创建与进程间通信" class="header-anchor">#</a> 进程创建与进程间通信</h1> <h2 id="本章导读"><a href="#本章导读" class="header-anchor">#</a> 本章导读</h2> <p>通过练习理解进程创建以及进程并发执行的过程，握fork系统调用的方法，了解进程间通信的常用方法。</p> <h2 id="实验内容"><a href="#实验内容" class="header-anchor">#</a> 实验内容</h2> <h3 id="进程创建"><a href="#进程创建" class="header-anchor">#</a> 进程创建</h3> <p>请问在下方的代码中，一共有多少个进程被创建？</p> <blockquote><p>可以通过fork返回的值来判断当前进程是子进程还是父进程。</p></blockquote> <div class="language-c extra-class"><pre class="language-c"><code><span class="token macro property"><span class="token directive-hash">#</span><span class="token directive keyword">include</span> <span class="token string">&lt;unistd.h&gt;</span></span>
<span class="token macro property"><span class="token directive-hash">#</span><span class="token directive keyword">include</span> <span class="token string">&lt;stdio.h&gt;</span></span>
 
<span class="token keyword">int</span> <span class="token function">main</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
<span class="token punctuation">{</span>
    <span class="token function">fork</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token function">fork</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">&amp;&amp;</span> <span class="token function">fork</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">||</span> <span class="token function">fork</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token function">fork</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token function">sleep</span><span class="token punctuation">(</span><span class="token number">100</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token keyword">return</span> <span class="token number">0</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
</code></pre></div><h3 id="创建进程树"><a href="#创建进程树" class="header-anchor">#</a> 创建进程树</h3> <p>编写程序创建进程树如图所示，在每个进程中显示当前进程标识getpid()和父进程标识getppid()。</p> <p><img src="data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAARMAAADvCAYAAADRjjBuAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAB9qSURBVHhe7Z1tjBXV/ceHf2IpoQlueYHYxKWuEUhfAJUqWCwrSV1840pig5gYQZPy8IbVFwKtzdZExaUmy9oUsEmzoK0LienWJq0CDYuCXaUSIIZujciDtd2SYrckNrS1yfznc3YOzt699+59mJk7D99PcnJn5t4798LOfO/v6fzOJNd1ex3HmeUNIYSolfOIyYC30Tq6L4QQNXH4//wNIYSoC4mJECIUJCZCiFCQmAghQkFiIoQIBYmJECIUJCZCiFCIpc7k8OHDzt/+9jfnT3/6k39klFmzZpmxaNEi54tf/KJ/VAiRQg5HJiZ79+519u/f7/T39zvz5893rrvuOmfOnDn+s6OcP3/ejJMnTzqtra3Ovffea8a1117rv0IIkRLCF5Nf/epXTkdHh7E2li9fXpE4/Pvf/3Zef/1189533nnHWbt2rTmHECI1hCcmuDBr1qxxZsyY4Wzfvt24L7WAO9TV1WXEpbe314iSECLxhCMmxEQ2b95sRCSsmx9xWr9+vbFS7r//fv+oECKh1C8mO3fudPbt22dclLBjHbg/q1evdmbPnu08+eST/lEhRAKpb6Lf7t27nTfeeMNYJlEETcnwEMj973//6zz77LP+USFEEqlZTN5++21nz549RlCiZuvWrSYwi/UjhEgmNYkJQVKyLQRI46oP4bOwTgprVYQQo5w9e9bfGi3NOHr0qL9XObW8x1KTmKxbt84EXGvN2NQCbtSuXbsUjBWZgZufm96ybds2f6t2brrpJvPIfUK8sRomTZrkvPzyy0ZQgsIEHNuwYYO/V5yqxYQCMwrNqB+JG4rfEDC5OyILvPLKK84TTzzh7znOfffdZ27oSqwDargKb/gbb7zRueuuu/w9Z8x2OfhMxocffujs2LHDWbJkidPS0nL1OOOOO+7wX12aqsXkhz/8oRmNotGfL0QYIASHDh1yzpw54x8ZFQPXdZ2nnnpqQiuAOizEoh63BEsIoeAzqe0KQlkGx+3o6+tzHnjgAf/Z4lQlJlgkp06daohVYsE6mTlzpvnPFCKtIBalrmF7HOujHCQ/Pv74Y39vPJRtWMui0IqBxx9/3AhFJXz00UfO9ddf7++VwDvZgDcqwvty7rp16/y9xtHd3e12dHT4e0Kki7a2NtdzKfy9sXgWgr/lup514G+Vx7MaUIRxI/j+I0eO+FtjKfZe3sd3BB7tcV5bioMHDw5UJSaeUrqvvfaav9c4zp075zY3N/t7QqQHblRubG7SQrFAYFpaWvy9yigUieA5C89fiBUOPpftoMDxPTgWPH8pQfKExH3++ecrF5ORkRH3uuuuc69cueIfCRdUr5zyFTJr1iwjKkKkBW7c4DXOdvAGtjf2RNgb3Q77Hh6LWTa8vpyw8Jy1QEoJRikQkp6eHvfSpUuVi8nQ0JA7Z84cfy98+AdXo8pJsZKEqAfrTiAE5W54C2JhxQMxslZOUFwKB68vFC4Lx3i/Pa/9PoWCZUdQDBGSp59+2n3zzTfdY8eODVQcgKVQjRnBUUBE2vuHmPHb3/7WP1oevgvfSYg0QyqWYCyD7YkgaErWBwiKksYlYOvd2ybj4omL2WZ44mQeeT11J/Z9QQoDwWwTsD1w4IB5rycuV8/HCNZ5DQ8PO5999plz+vRp5/jx45Vnc8jkRFWkRips5cqVZtvzvczjRPBd+E5CpBlucK7lZcuW+Udqx4pLpVAwF6xzsVgBmogHH3zQvG7q1KmmkLXqOpOwIdVMrv0nP/mJ09TUZLqz1ZM7FyJNcK3bH8VgNWwl3H777Vffw3luuOEGs10JpIo996Sk+HBeLBTuR5teLpaqRlDgpZdeqlxMKGf/5z//6e+FxwsvvOB897vfdaZPn37VhKKkdyIuX74cyUxlIeKCGxqrHPcG94Wbu5ofUmpMbr31VrPNeaqZanLs2LExblXQykc0+C6Fbk6puhgrKLyoogDs4OCgu2jRIn8vHAj48BV4hJMnT14N9NhjpfDcojHBICHSBIHTYgkHAqDlrn0CpfYeCY5COEclAV0Lry32uTYgWwGVB2BpCB12wPO5554zQSLrn82bN88oIfzsZz8zj6Xgu/CdhEgblLFjSQRL6S38+pcrk7dVq4XDuiLWHeGeqiSgG6RcnITvY89f0nryvkjFRWvUmQwPD/t79XHp0iW3qalpXF4ba4OvxXO8phjUuvBdqH0RIk1wbQdrQYqBhcDr7KjCOjBwTwXfb0c5SwUrqfBzGfZcwe9QeM/6VFcBu3r1are3t9ffq49S5lpw7Nq1y3/1WAYGBtzW1lZ/T4jkw43MNZ1USghENVTu5kB7e3to0/9pdER/Eu9LjBvf+973zGt+9KMfmcdCiDBXOr1aiCSAy8G1nVSqSSmXoioxwRejn0m9sRMyOJ5ZZTrPF+Oxxx4zaWLP7CqaLkPQVqxY4e8JIZJAVWJCi0baNXouin+kegjebNmyxfnGN77hHxkPaWLEBgr7OiAkdKsvXB1QCNFYql7qguUnuJFpKB13NqWRny2EKEv1S11gndD/tRHr2HR3d5vCHAmJEMmjajEB6vCJm7AoeVxgjRB4VctGIZJJzSv64XKwFCgB0qjjFwgXwV8KemSVCJFIal/Rz662h9tBhicqmDPAZ9DvUkIiRHKpWUwAi4TsChmeKFweXBuEhAXRaSQthEgudS9cDswmXrNmjbEcOjs767YgLly4YIKtWDxYP7JIhEg89S1cbqEVAJYJE/WIoxAkraVdAXEYqmK/+c1vOgcPHlSMRIgUEYqYWMjy2LWA6R519913G3EoVzHLc8RDWIsH4cAaeffdd52bb765ZP8EIUTyCMXNKQVi8Oqrr5q4CqIxefJkY7kAokGDIwSETA3zfni0C6EjSqtWrXIGBwdjWxxdCFEzhyMVk0JwYwiqAgHViTqlPfroo05zc7MJ8AohEk28YlItxF0WL17sDAwMKHYiRLIJJwAbFVguGzdubEjpvhCiOhItJkBQF9coysI4IUT9JF5MgNXc6RUrhEguqRATMkDETMLq8iaECJ9EB2CDkFomGDs0NKRUsRDJI9kB2CBYJg899JDpHSuESB6psUyAOpW5c+eaQjalioVIFOmxTAD3ZuvWraaYTQiRLFIlJkBLAnqc2EpaIUQySJ2YgFLFQiSPVIoJ83pIFzMjWQiRDFIVgA2iVLEQiSJdAdggZHOYt8OCXkKIxpNaMQHm7Rw+fPhqQyYhRONItZjg3tBzVtaJEI0n1WICtHukmE0tHoVoLKkXE6CQjZ4niIoQojFkQkyUKhai8aQ2NVyIWjwK0VDSmxouhBaPa9eudbq6uvwjQog4yYyYAF3sSRWrxaMQ8ZMpMQGWFdWsYiHiJ3Ni0traalyeSlo8kv3BkmHUspypEOJzMhOADUKLApYmPXHixJh5O/WsMCiEKEt2ArBBWOeYYrbt27cb64OF1LFWenp6zOLqiIwnouMsE47x3NKlS836xwgLJfsIjxCiPJm0TACh+MpXvuJMnTrVefjhh01wdqLlSAvhHIgKIkT/Wc4hS0WIoiR7edBawcpYs2aN8+mnnxohYQH0euB8pJzpPbt3717VsQgxnuyJCfGS1atXm/YEK1as8I+GA60isU6otJ0/f75/VAjhka2YCa0IbKwkbCEBgrVYJgiKalmEGEtmLBPiG/ZmnzNnjn80GgjIkukhOySXRwhDdiwT4iL0NolaSAABwdWhUz4iJoTISNEaNzY3eBSuTSmwgtra2kzaWQiRATcHywBrhOBo3C5HIz9biISRfjcHqwSLpBE3MzUnBHspbBMi76TaMkmKZcD6x/39/bHEa4RIKOm2TMimUO/RaBeDdDRiIkSeSbWYMGmPG7nREIg9cOCAvydEPkm9ZUK9R6Mhs0PBnNoYiDyTWjGhbJ4AaD0uztGjR51JkyaVHYjVCy+84HzyySf+u8bD95g9e7aqYmOA/2PS8XYQgGfWt2g8qRUTqlDrjZUsWbLEtB3gggTcFfbtOHLkiJlpTLYGUSknKHwXtSqIHtpLBDl16pRZ5gThJxC+fv16iUujIJvjjdTR39/vtre3+3v14YmGy3+FJyb+kbFwnOe7urr8I+Pp6Ohwu7u7/T3RCIaGhtydO3e6ra2trifubmdnpzsyMuI/KyJmILWWCfGJavuT1MqyZcvM46FDh8xjMaZNm6aYSYMhNY8VyXInNLmCBQsWGHdI0x6iJ9UB2LggPgO33HKLeRTJB7cTEbGiQhtP+3cU0ZBaMcF3jvriOHv2rLNt2zbHM52dhQsXOo899pj/zHj4LoX+vGg8WK+ICkvIUimtIHl0pFZM+OW5ePGivxcO+/fvH5PJaWlpcTZt2mSEZN++fc706dP9V46H71JvQFhEB+l73B8CtKTxRfikWkyIUYTpCxfL5nDxvfvuu0ZQSCWXggtU5fTJBiulr6/PWCiKoYRPasWEC4NS+ijTgKSOd+zYYfq/joyMOPfcc0/R9DAuDuIjNyf58DcizW/LAUR4pDoAy9o2lNRHzSOPPGIeEZShoSGzHYR1eOLspSLqA9eVFQdknYRLqsXEtk6MmnKxEiDWgosk0gEuMkPB2HBJtZhgsrKoViVLgdYD5fTQ1NRkqiyDcEEODw8nYo6QqBxcZIlJuKRaTMDO0aiH3//+9/7WWGxq2DY/In5SaKWE8fkifmbMmKHpDyGTejHhFwYLpRbrxE70w4eGYqnhn/70p87KlStNZocG0kH4ZSP4moQ2CEI0mtSLCRCZf/bZZ6suYrMT/cqNM2fOmOUzeG0Q0tJYLDwnhMiImBBMoxcrS4LGFaHnszZv3qzaEiF8MiEmQIUji4uzNGjUbNmyxbntttvk3ggRIDNiAgjJ0qVLndbW1khm8GL1EDf5whe+YKwSIcTnZEpMgPJ3siukaulaHxaUyzPzFGuEZjxCiLFkTkwAy2T37t3Oo48+am7+emYXkz7kPFS4MvO0MKMjhBglk2ICBEYHBweN64O4IAIITCXuD+4MqWbeS3p4ypQppoyeuIwQojipXx60UkjhUkfC+jZ2rZ3CTAwWDIP6EQQIq+aaa65xXnnlFa2LkzFsoaEKDkPjcG7EJAgzjXFfCvtaUPzGwAKh47wFF4dMkbI32UFiEjr5FJNqQXRWrVpl3KagyIj0IjEJnfQvXB4HuEO4PeqBIURpJCYVQiaHHhiaHCZEcSQmFYJ709nZaapfhRDjkZhUAaliMj3qgyHEeCQmVdLb22sm+QkhxiIxqRJqVBgUwAkhPkdiUgMEY5mfo4bEQnyOxKQGqJ5du3atJvwJEUBiUiMdHR1m/k49kwiFyBISkxohVYy7w4xiIYTEpC6Yq0PcJI61e4RIOhKTOlEwVohRJCZ1QpqYWcaatyPyjsQkBCizZ9U/zdsReUZiEgLXXnuts3HjRqWKRa6RmIQEC3LRwFrzdkRekZiESHd3t1LFIrdITEKEBkq4PLWseyxE2pGYhMzOnTuNdaJUscgbEpOQYd4OzadZSF2IPCExiQCWDt2zZ49SxSJXSEwigHk7BGNZqlSIvCAxiQjm7bB6IGv0CJEHtG5OhFBzQovHEydO+EfGw2vI/ly8eLHoomDNzc0mS8QQ4aF1c0JHi3BFDZkdBIH+JxZ6oHR1dZnZxqSS29vbyy5XinWD6LCyIE2ZtOZx/UhMQkdiEjUEYe+8806zGiAgIlgilN8vX77cWB+VgMvE+5gDxHuIySBAojYkJqGjFf2ixrZ4xN1ZvHixM23aNOP2UH5fqZAAFgxLbSBKWDIIFJ3yhUgKEpMY+N///uccPXrUefXVV03a+L333nN+97vf+c9Wz/33329E5c0331T5vkgMEpMI+eSTT0x6+C9/+Yvz97//3bn55pvN8Y8//tg5c+aM2a4VLBUsE+IxxFJUcSsajcQkIrA8fvzjHxs3h/hGVBDYveeee7QwmGg4EpMIQEhwQz766CPTOClqEBJEa/v27f4RIeJHYhIyCAl9TY4dO+bs2LHDPxo9WD9ke1Qkl1/Onj3rbznO3r17TZyuWmp5j0ViEiIIyVtvvWUK0KiAJdD6hz/8Ydz49NNP/XeEC31ocXsUP0k327Ztc2666SZ/rzrs+wjSk/2rhkmTJjkvv/yyEZSgMAHHNmzY4O8VR2ISIsPDw+bxS1/6kvPZZ585x48fLzr+9a9/OU1NTea1YULRGyljNbeeGP6v3n//fX8vXqgv4sYtNTZt2uQcOHDAf3VxOEfhDX/jjTc6d911l7/njNkuh/3cDz/80FjTS5YscVpaWsZ8pzvuuMN/dRkoWvOGCAlPvV3vl8W9dOmSfyRePEFzm5ub3StXrvhHRDFOnDjhzp8/399LDt5N7G9NDK89cuSIvzfK+vXr/a2x28Xo6upyRyVgdNsTE7MNhe/t6+sb91kFDMgyCRHm1hw6dMgEQ3/xi1+Y1HDc8NnM48FnFqVhiRJIQs9ea2FgbUxkkQTZvXu3KTMoBY26rGVRaMXA448/jpL4e+UhmXD99df7eyVAUYyuiLrp7Ow0A1588UW3p6enIRZKb2+v6/nL/p4oRX9/v3vvvff6e43DWggT/PKXBKuB9xeOoHVR6tzF3sv72trazPM82uO8thQHDx4ckJiEyKJFi9zBwUF/z3V/+ctfNkRMRkZG3GnTpvl7ohybN292t27d6u81jolcklLU4+ZY4cC9YTvo5uBCcSx4/lKC5AmJ+/zzz8vNCQsm9DHDNzijl8rU6dOn+3vxQXUs83607MbEsLzrqVOnElGjEwx4BgfuTxAyNvY5AqPWheGx2HwvXl8sE+PpgAm4Pvfcc45ngZigq00NU6HN8wRjLcFtCxnMP/7xj84DDzygbE5YICbEK8KEmAuzhIPRf3thcOHwXKm6gJkzZ6ptZIUwLeHChQtG/JmdHRVBESgcxDfIpnADF47gwvikjYmrcNxzOxzPWjDXA+dADMgEBc/JI6//1re+VTRuwjHGsmXLzOc/9dRT5nip7xqMxSEk1FMtWLDAnENiEhJhiwm/lrfddpuzZcsWUy/guUvmAnrnnXfMhbFw4UIz87gUM2bMkJhUiG2zSSNwbgzaEkQhKvbXvtigNcVf//pX/5WlIWhKChgIimItIDacw4qLPafnwphHXk/diX1fEIQoKFZsIxpWsLBY7PkYnMdCKQQlEKdPnzYlDxKTkAhTTBAS6kX+8Y9/OB988IH5A1p3iUf2BwYGytaqYO7idonKodDQdsVDVLgZ01RRbMWlUrAynnjiCX/vc6wATcSDDz5oXjd16lTzwyYxCQmqTvmFCwNM1ZGREePPloq5zJs3z7QzKJcaFNVDvAnLBFHh/5j1o3EZV61aZY4jLkmx+G6//farbgfu7g033GC2KwG3hBYWpcSH82Kh7N+//6qLUxi7AQQFXnrpJYlJWIRlCXBR8AfE6gialMV45JFHzK9RMSjpDzuGkycQFX5tsQARFlzON954w1iMiIu9wRhhwLUzYR1HAfyQ3HrrrWabWMdE10uQwrljwWsX0UBoCt2coDsUxAqKxCQkuHHD+MV67bXXzKO9SMqB1YIPXQz8WYlJfXCDsZgaAkJMA5gFTmwCkbGjFvjlLwyeV+JaEIC1Ioa1RNCV7cIbvViwNUg54eFc1U5SNYLiKY7qTEKAMnbv5vX3ascWCU1UIzARhTUvonI8gXBbW1tdz9o0dShDQ0P+M+HC39r+ndmuB64ZO2o5V6nrzZ6LGhN7/hL1JqozCQusAGImYQU9i9ULVArxG+8GuFoyLiqDvx1WCHESLJBz586ZOpTCVQPCAguAzByWRSVWSTm8m/nqIKhqrZfgKFZrYiF7gzVT+B57Ltwoe/6SeE/KMgmJTZs2uc8884y/Vxv8QvBnqeeXijLx9vZ2f09Ugudemol/WCVxQ+VpqerSuAjh82WZhAmBK4Kn9cAvFdTTI5bvUCzyLorDhLmenh4T/2jEYmdYJdWkdKMgjM+XmIQIFyI9MuoJxH772982mRyqEUtVt1pshWwQXByCuNRMiInB1WDVAM+aMxkcUTsSk5ChRsRG/muBDM3Pf/5zs03la7mo/A9+8APnvvvu8/dGoYQaIVEmZ2IQfZYKoZw+rBqhXIOvM+ryiLCYN2+eab5TD3ZquGeljGtc85vf/MbEVE6ePOkfGYXZwnPmzDGZJTExHR0dbnd3t78n6kQtCKKAYN7y5cv9vdpBQAjI2ungjIULFxpxKdbaYN26da5nmfh7ohwIL6l8daQLjQGtNRwRTNBjKVBK3uOAQqpf//rX5lFMDLESgq62SFDUjdYajgrqEyi/juNipW8JN4bWHq4cWmxGVT+SVyQmEYKVQAEUmYKoYI0eArWUZyuIWDm0GMByFOEhMYkQUo3MMn3xxRfNHI+wwRLBjeIz6qmYFSIMJCYRg7WAZXL58mVn8eLFofTHwES/++67zbRvfH/VR4gkIDGJCWIodPPC7aEOBPekWhAR6iJoL7hx40ZjpiMmQiQBiUmM0Gyakm1iHIgCfTHYtmsEB1sFUsnKMcSC1371q181ItLc3Gwm8VEujziRNdJyoCIJKDXcQKjARCwQE9wgmvDwCJMnTzZuEW5SW1ubsWaKxUUQGgSGNYZF5dA1Lfgo6uawxCTlYJXMnTvXGRwcVAl9FUhMQkd1JmkHy4X5QMRihGgkEpMMQK9SArpadEs0EolJRmC28Pr16/09IeJHYpIRyBQRMyGYK0QjkJhkCKwTsjtKFYtGIDHJEFgmLGGQhEW4Rf6QmGQMuqrTyjEpq86J/CAxyRikihEUKmOFiBOJSQahRJ80sVLFIk4kJhlFqWIRNxKTjKJUsYgbiUmGUapYxInEJMNgmTz00EORdHkTohCJScahreOePXuUKhaRIzHJOKSK6fKGuyNElEhMcgBVsbR8VKpYRInEJCfQyX7NmjX+nhDhIzHJCfPnzzeLTrG+jhBRIDHJEWpALaJEYpIjlCoWUSIxyRlKFYuokJjkDKWKRVRITHIIqeLz58/XtKqgEKWQmOSUiWYVs5ogY/fu3c6uXbuu7it4K0ohMckppIoZiAVgqdDukVUEJ02aZBanYiAgp06durrPIum8j20VwYkgWtEvxxCEXbhwofP1r3/dee+998wSpCtXrjTtC8qBiNDagDFlyhSTcp7oPUkDMQw+irrRin55hUXSSRH/5z//ca655hrn3LlzFYtC0DLhPQRzESJliPKNxCSH4NIsX77cLHj+5z//2fnOd77jP1M9iA/rHNMqknPK9ckvEpOcQQwEK4JYCRYFqWKyO/XCOV9//XUT1FXJfj6RmOQIhAT3hEfm6YQNFbYDAwNGTCQo+UNikhNwbah+5SYnIxMVWDp8Rk9Pj1yenCExyQHUhhDTIPWL9RA1CEpfX5/5TAK9Ih9ITHIAFkl7e3us6dtZs2YZlwpBEflAYpJxSNdSD9KINXQIyuJeyd3JBxKTjEMtycaNG43r0QhwrTSpMB9ITDIM8Yp9+/Y1dGW/1tZWx3Vdk0ES2UZikmFwb9ra2hpmlVgQFIlJ9pGYZJj9+/ebqtRGQ+wkacuUMo2g0SKbNSQmGYV0MNZAEsSEuTwXL15M1Nwdlv6IonAvz0hMMgo3Lr+89RSoHT161LQjKDW+/OUvG7H6/ve/75w9e9Z/V3Fmz55tbuCkQIYJkRPhITHJKKRkmchXD0uWLDHBU5ojAfEX9u2gdP6WW25xnnnmGaelpcWISimoO+E7JQFcLoSE7yTCQ2KSUbBMwqp2/drXvuZvjWXevHnO008/bX7lm5qajKhs27bNf3YsM2fOTISbg/vX1dXldHZ2+kdEWEhMMgo3TVwBRkRlx44dZnvTpk3msZDJkycnouUjqxpSdyMXJ3wkJhkFIYnz5qWNAa5OKRqdPeH/AiEhdhNGywUxHolJRsHFidutoOVjKYaHh2OZZFgM3DB62y5dulRtGiNEYpJRCC5euHDB34uHadOm+VvjIfgad8ATEVmxYoWxSOwsZhEdEpOMghWAaZ+UFgDvv/9+LHUdWGNkn+68804jIiyHeuLECdWUxIDEJKMQn6CMnVaKcXH58mV/ayxYCDNmzAjNzUEkKcizA9cFC2Tu3LnOggULzNIcZGsQEapvRTxITDIMdSFxigmTCotBXUdYNzXnIg395JNPXh2ABdLf329iMywwhpCKmHFdd8AbIoOMjIy4njXgXrlyxT9SG0eOHHG5VDxx8o+Mp6+vz7zGu9H9I5+zdOlSd2BAl1nGGZBlkmEopSfDwi91lOBWbNiwwWzbehMLbgil97IUso/EJOPQspHmzvXUnJw+fdrfGgsiQgm9LQAjY1JYw9HR0WEW6hLZR2KScQh6Eq+oxTqxE/3WrVtn9mlpEJzoh4gcP37cZE8++OCDcUJCfIN0sKpN84HWGs4BWCXM7qWFY1xNpakrQcRwc6JcWkMkBq01nAdIE7OCHy5HHFWxiNeqVavMZ0pI8oPEJCfgbmCZ4IpEWciGkPAZmkyXPyQmOYKMCgVePEbRqAirh8pTxKQwfiKyj8QkZyAkBEaZpxJmloVzEpch0CshyScSkxyCy0NlLBMBKUFHCGrl7bffNjNyiY9wTrk2+UXZnJyDu0MtCjUjZF8ocpso48NcGwSIMWXKFGPhxLn0qEgkhyUmwkAqF3Fgfg3WBr0/ACsGwRgaGjL7PMcMXISHIUtE+EhMRHGoDwFEhgyNncKPBdLIjmkisUhMhBChoKI1IUQ4SEyEEKGAm9PrPWo1IiFEHTjn/x/y/W4BqWnshwAAAABJRU5ErkJggg==" alt="图片1" title="进程树"></p> <h3 id="信号通信"><a href="#信号通信" class="header-anchor">#</a> 信号通信</h3> <p>用fork()创建两个子进程，再用系统调用signal()让父进程捕捉键盘上来的中断信号（即DEL键）；当捕捉到中断信号后，父进程用系统调用kill()向两个子进程发出信号，子进程捕捉到信号后分别输出下列信息后终止：</p> <p>Child process1 is killed by parent!</p> <p>Child process2 is killed by parent!</p> <p>父进程等待两个子进程终止后，输出如下的信息后终止：</p> <p>Parent process is killed!</p> <h3 id="管道通信"><a href="#管道通信" class="header-anchor">#</a> 管道通信</h3> <p>实现进程的管道通信，用系统调用pipe()建立一管道，二个子进程P1和P2分别向管道各写一句话：</p> <p>Child 1 is sending a message!</p> <p>Child 2 is sending a message!</p> <p>父进程从管道中读出二个来自子进程的信息并显示。</p></div> <footer class="page-edit"><!----> <!----></footer> <!----> </main></div><div class="global-ui"></div></div>
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