📄 fcntl.c
字号:
<!doctype html public "-//W3C//DTD HTML 3.2//EN"><html><head><title>Linux/fs/fcntl.c</title><meta http-equiv=Content-Type content="text/html; charset=gb2312"><base href="http://oldlinux.org/lxr/http/"></head><body bgcolor=white><div align=center> [<b><i>源代码浏览</i></b>] [<a href="diff/fs/fcntl.c">区别标定</a>] [<a href="ident">标识符搜索</a>] [<a href="search">文本搜索</a>] [<a href="find">文件搜索</a>]</div><h1 align=center> <a href="http:/"> OldLinux</a> <a href="http:blurb.html"> 交叉引用</a><br> <a href="source/">Linux</a>/<a href="source/fs/">fs</a>/<a href="source/fs/fcntl.c">fcntl.c</a></h1><div align=center> <b>版本:</b> [<a href="source/fs/fcntl.c?v=1.0">1.0</a>] [<a href="source/fs/fcntl.c?v=0.99.11">0.99.11</a>] [<a href="source/fs/fcntl.c?v=0.99">0.99</a>] [<a href="source/fs/fcntl.c?v=0.97">0.97</a>] [<a href="source/fs/fcntl.c?v=0.96a">0.96a</a>] [<a href="source/fs/fcntl.c?v=0.95">0.95</a>] [<a href="source/fs/fcntl.c?v=0.12">0.12</a>] [<b><i>0.11</i></b>] [<a href="source/fs/fcntl.c?v=0.01">0.01</a>] <br> <b>体系结构:</b> [<b><i>i386</i></b>] <br></div><hr><pre> <a name=L1 href="source/fs/fcntl.c#L1">1</a> <b><i>/*</i></b> <a name=L2 href="source/fs/fcntl.c#L2">2</a> <b><i> * linux/fs/fcntl.c</i></b> <a name=L3 href="source/fs/fcntl.c#L3">3</a> <b><i> *</i></b> <a name=L4 href="source/fs/fcntl.c#L4">4</a> <b><i> * (C) 1991 Linus Torvalds</i></b> <a name=L5 href="source/fs/fcntl.c#L5">5</a> <b><i> */</i></b> <a name=L6 href="source/fs/fcntl.c#L6">6</a> <a name=L7 href="source/fs/fcntl.c#L7">7</a> #include <string.h> <a name=L8 href="source/fs/fcntl.c#L8">8</a> #include <errno.h> <a name=L9 href="source/fs/fcntl.c#L9">9</a> #include <linux/sched.h> <a name=L10 href="source/fs/fcntl.c#L10">10</a> #include <linux/kernel.h> <a name=L11 href="source/fs/fcntl.c#L11">11</a> #include <asm/segment.h> <a name=L12 href="source/fs/fcntl.c#L12">12</a> <a name=L13 href="source/fs/fcntl.c#L13">13</a> #include <fcntl.h> <a name=L14 href="source/fs/fcntl.c#L14">14</a> #include <sys/stat.h> <a name=L15 href="source/fs/fcntl.c#L15">15</a> <a name=L16 href="source/fs/fcntl.c#L16">16</a> extern int <a href="ident?i=sys_close">sys_close</a>(int fd); <a name=L17 href="source/fs/fcntl.c#L17">17</a> <a name=L18 href="source/fs/fcntl.c#L18">18</a> static int <a href="ident?i=dupfd">dupfd</a>(unsigned int fd, unsigned int arg) <a name=L19 href="source/fs/fcntl.c#L19">19</a> { <a name=L20 href="source/fs/fcntl.c#L20">20</a> if (fd >= <a href="ident?i=NR_OPEN">NR_OPEN</a> || !<a href="ident?i=current">current</a>->filp[fd]) <a name=L21 href="source/fs/fcntl.c#L21">21</a> return -<a href="ident?i=EBADF">EBADF</a>; <a name=L22 href="source/fs/fcntl.c#L22">22</a> if (arg >= <a href="ident?i=NR_OPEN">NR_OPEN</a>) <a name=L23 href="source/fs/fcntl.c#L23">23</a> return -<a href="ident?i=EINVAL">EINVAL</a>; <a name=L24 href="source/fs/fcntl.c#L24">24</a> while (arg < <a href="ident?i=NR_OPEN">NR_OPEN</a>) <a name=L25 href="source/fs/fcntl.c#L25">25</a> if (<a href="ident?i=current">current</a>->filp[arg]) <a name=L26 href="source/fs/fcntl.c#L26">26</a> arg++; <a name=L27 href="source/fs/fcntl.c#L27">27</a> else <a name=L28 href="source/fs/fcntl.c#L28">28</a> break; <a name=L29 href="source/fs/fcntl.c#L29">29</a> if (arg >= <a href="ident?i=NR_OPEN">NR_OPEN</a>) <a name=L30 href="source/fs/fcntl.c#L30">30</a> return -<a href="ident?i=EMFILE">EMFILE</a>; <a name=L31 href="source/fs/fcntl.c#L31">31</a> <a href="ident?i=current">current</a>->close_on_exec &= ~(1<<arg); <a name=L32 href="source/fs/fcntl.c#L32">32</a> (<a href="ident?i=current">current</a>->filp[arg] = <a href="ident?i=current">current</a>->filp[fd])->f_count++; <a name=L33 href="source/fs/fcntl.c#L33">33</a> return arg; <a name=L34 href="source/fs/fcntl.c#L34">34</a> } <a name=L35 href="source/fs/fcntl.c#L35">35</a> <a name=L36 href="source/fs/fcntl.c#L36">36</a> int <a href="ident?i=sys_dup2">sys_dup2</a>(unsigned int oldfd, unsigned int newfd) <a name=L37 href="source/fs/fcntl.c#L37">37</a> { <a name=L38 href="source/fs/fcntl.c#L38">38</a> <a href="ident?i=sys_close">sys_close</a>(newfd); <a name=L39 href="source/fs/fcntl.c#L39">39</a> return <a href="ident?i=dupfd">dupfd</a>(oldfd,newfd); <a name=L40 href="source/fs/fcntl.c#L40">40</a> } <a name=L41 href="source/fs/fcntl.c#L41">41</a> <a name=L42 href="source/fs/fcntl.c#L42">42</a> int <a href="ident?i=sys_dup">sys_dup</a>(unsigned int fildes) <a name=L43 href="source/fs/fcntl.c#L43">43</a> { <a name=L44 href="source/fs/fcntl.c#L44">44</a> return <a href="ident?i=dupfd">dupfd</a>(fildes,0); <a name=L45 href="source/fs/fcntl.c#L45">45</a> } <a name=L46 href="source/fs/fcntl.c#L46">46</a> <a name=L47 href="source/fs/fcntl.c#L47">47</a> int <a href="ident?i=sys_fcntl">sys_fcntl</a>(unsigned int fd, unsigned int cmd, unsigned long arg) <a name=L48 href="source/fs/fcntl.c#L48">48</a> { <a name=L49 href="source/fs/fcntl.c#L49">49</a> struct <a href="ident?i=file">file</a> * filp; <a name=L50 href="source/fs/fcntl.c#L50">50</a> <a name=L51 href="source/fs/fcntl.c#L51">51</a> if (fd >= <a href="ident?i=NR_OPEN">NR_OPEN</a> || !(filp = <a href="ident?i=current">current</a>->filp[fd])) <a name=L52 href="source/fs/fcntl.c#L52">52</a> return -<a href="ident?i=EBADF">EBADF</a>; <a name=L53 href="source/fs/fcntl.c#L53">53</a> switch (cmd) { <a name=L54 href="source/fs/fcntl.c#L54">54</a> case <a href="ident?i=F_DUPFD">F_DUPFD</a>: <a name=L55 href="source/fs/fcntl.c#L55">55</a> return <a href="ident?i=dupfd">dupfd</a>(fd,arg); <a name=L56 href="source/fs/fcntl.c#L56">56</a> case <a href="ident?i=F_GETFD">F_GETFD</a>: <a name=L57 href="source/fs/fcntl.c#L57">57</a> return (<a href="ident?i=current">current</a>->close_on_exec>>fd)&1; <a name=L58 href="source/fs/fcntl.c#L58">58</a> case <a href="ident?i=F_SETFD">F_SETFD</a>: <a name=L59 href="source/fs/fcntl.c#L59">59</a> if (arg&1) <a name=L60 href="source/fs/fcntl.c#L60">60</a> <a href="ident?i=current">current</a>->close_on_exec |= (1<<fd); <a name=L61 href="source/fs/fcntl.c#L61">61</a> else <a name=L62 href="source/fs/fcntl.c#L62">62</a> <a href="ident?i=current">current</a>->close_on_exec &= ~(1<<fd); <a name=L63 href="source/fs/fcntl.c#L63">63</a> return 0; <a name=L64 href="source/fs/fcntl.c#L64">64</a> case <a href="ident?i=F_GETFL">F_GETFL</a>: <a name=L65 href="source/fs/fcntl.c#L65">65</a> return filp->f_flags; <a name=L66 href="source/fs/fcntl.c#L66">66</a> case <a href="ident?i=F_SETFL">F_SETFL</a>: <a name=L67 href="source/fs/fcntl.c#L67">67</a> filp->f_flags &= ~(<a href="ident?i=O_APPEND">O_APPEND</a> | <a href="ident?i=O_NONBLOCK">O_NONBLOCK</a>); <a name=L68 href="source/fs/fcntl.c#L68">68</a> filp->f_flags |= arg & (<a href="ident?i=O_APPEND">O_APPEND</a> | <a href="ident?i=O_NONBLOCK">O_NONBLOCK</a>); <a name=L69 href="source/fs/fcntl.c#L69">69</a> return 0; <a name=L70 href="source/fs/fcntl.c#L70">70</a> case <a href="ident?i=F_GETLK">F_GETLK</a>: case <a href="ident?i=F_SETLK">F_SETLK</a>: case <a href="ident?i=F_SETLKW">F_SETLKW</a>: <a name=L71 href="source/fs/fcntl.c#L71">71</a> return -1; <a name=L72 href="source/fs/fcntl.c#L72">72</a> default: <a name=L73 href="source/fs/fcntl.c#L73">73</a> return -1; <a name=L74 href="source/fs/fcntl.c#L74">74</a> } <a name=L75 href="source/fs/fcntl.c#L75">75</a> } <a name=L76 href="source/fs/fcntl.c#L76">76</a> </pre><hr><div align=center> [<b><i>源代码浏览</i></b>] [<a href="diff/fs/fcntl.c">区别标定</a>] [<a href="ident">标识符搜索</a>] [<a href="search">文本搜索</a>] [<a href="find">文件搜索</a>] </div><hr>本网页由 <a href="http:blurb.html">LXR引擎</a> 自动生成.<br></html>⌨️ 快捷键说明
复制代码
Ctrl + C
搜索代码
Ctrl + F
全屏模式
F11
切换主题
Ctrl + Shift + D
显示快捷键
?
增大字号
Ctrl + =
减小字号
Ctrl + -