mknod.html
来自「unix 下的C开发手册,还用详细的例程。」· HTML 代码 · 共 210 行
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2 Final//EN"><html><head><!-- Copyright 1997 The Open Group, All Rights Reserved --><title>mknod</title></head><body bgcolor=white><center><font size=2>The Single UNIX ® Specification, Version 2<br>Copyright © 1997 The Open Group</font></center><hr size=2 noshade><h4><a name = "tag_000_007_642"> </a>NAME</h4><blockquote>mknod - make a directory, a special or regular file</blockquote><h4><a name = "tag_000_007_643"> </a>SYNOPSIS</h4><blockquote><pre><code>#include <<a href="sysstat.h.html">sys/stat.h</a>>int mknod(const char *<i>path</i>, mode_t <i>mode</i>, dev_t <i>dev</i>);</code></pre></blockquote><h4><a name = "tag_000_007_644"> </a>DESCRIPTION</h4><blockquote>The<i>mknod()</i>function creates a new file named by the pathname to which the argument<i>path</i> points.<p>The file type for <i>path</i> is OR-ed into the <i>mode</i> argument, andmust be selected from one of the following symbolic constants:<p><table bordercolor=#000000 border=1 align=center><tr valign=top><th align=center><b>Name</b><th align=center><b>Description</b><tr valign=top><td align=left>S_IFIFO<td align=left>FIFO-special<tr valign=top><td align=left>S_IFCHR<td align=left>Character-special (non-portable)<tr valign=top><td align=left>S_IFDIR<td align=left>Directory (non-portable)<tr valign=top><td align=left>S_IFBLK<td align=left>Block-special (non-portable)<tr valign=top><td align=left>S_IFREG<td align=left>Regular (non-portable)</table><p>The only portable use of<i>mknod()</i>is to create a FIFO-special file.If<i>mode</i>is not S_IFIFO or<i>dev</i>is not 0, the behaviour of<i>mknod()</i>is unspecified.<p>The permissions for the new file are OR-ed into the <i>mode</i> argument, andmay be selected from any combination of the following symbolic constants:<p><table bordercolor=#000000 border=1 align=center><tr valign=top><th align=center><b>Name</b><th align=center><b>Description</b><tr valign=top><td align=left>S_ISUID<td align=left>Set user ID on execution.<tr valign=top><td align=left>S_ISGID<td align=left>Set group ID on execution.<tr valign=top><td align=left>S_IRWXU<td align=left>Read, write or execute (search) by owner.<tr valign=top><td align=left>S_IRUSR<td align=left>Read by owner.<tr valign=top><td align=left>S_IWUSR<td align=left>Write by owner.<tr valign=top><td align=left>S_IXUSR<td align=left>Execute (search) by owner.<tr valign=top><td align=left>S_IRWXG<td align=left>Read, write or execute (search) by group.<tr valign=top><td align=left>S_IRGRP<td align=left>Read by group.<tr valign=top><td align=left>S_IWGRP<td align=left>Write by group.<tr valign=top><td align=left>S_IXGRP<td align=left>Execute (search) by group.<tr valign=top><td align=left>S_IRWXO<td align=left>Read, write or execute (search) by others.<tr valign=top><td align=left>S_IROTH<td align=left>Read by others.<tr valign=top><td align=left>S_IWOTH<td align=left>Write by others.<tr valign=top><td align=left>S_IXOTH<td align=left>Execute (search) by others.<tr valign=top><td align=left>S_ISVTX<td align=left>On directories, restricted deletion flag.</table><p>The user ID of the file is initialised to the effective user ID of theprocess. The group ID of the file is initialised to either the effectivegroup ID of the process or the group ID of the parent directory.<p>The owner, group, and other permission bits of <i>mode</i> are modified by thefile mode creation mask of the process. The<i>mknod()</i>functionclears each bit whose corresponding bit in the file modecreation mask of the process is set.<p>Upon successful completion,<i>mknod()</i>marks for update the<i>st_atime</i>,<i>st_ctime</i>and<i>st_mtime</i>fields of the file. Also, the<i>st_ctime</i>and<i>st_mtime</i>fields of the directory that contains the new entry are marked for update.<p>Only a process with appropriate privileges may invoke<i>mknod()</i>for file types other than FIFO-special.</blockquote><h4><a name = "tag_000_007_645"> </a>RETURN VALUE</h4><blockquote>Upon successful completion,<i>mknod()</i>returns 0. Otherwise, it returns -1, the new file isnot created, and <i>errno</i> is set to indicate the error.</blockquote><h4><a name = "tag_000_007_646"> </a>ERRORS</h4><blockquote>The<i>mknod()</i>function will fail if:<dl compact><dt>[EPERM]<dd>The invoking process does not have appropriate privileges and thefile type is not FIFO-special.<dt>[ENOTDIR]<dd>A component of the path prefix is not a directory.<dt>[ENOENT]<dd>A component of the path prefix specified by <i>path</i> does not name anexisting directory or <i>path</i> is an empty string.<dt>[EACCES]<dd>A component of the path prefix denies search permission, or write permissionis denied on the parent directory.<dt>[EROFS]<dd>The directory in which the file is to be created is located on a read-onlyfile system.<dt>[EEXIST]<dd>The named file exists.<dt>[EIO]<dd>An I/O error occurred while accessing the file system.<dt>[EINVAL]<dd>An invalid argument exists.<dt>[ENOSPC]<dd>The directory that would contain the new file cannot be extended orthe file system is out of file allocation resources.<dt>[ELOOP]<dd>Too many symbolic links were encountered in resolving <i>path</i>.<dt>[ENAMETOOLONG]<dd>The length of a pathname exceeds {PATH_MAX}, or pathnamecomponent is longer than {NAME_MAX}.</dl><p>The<i>mknod()</i>function may fail if:<dl compact><dt>[ENAMETOOLONG]<dd>Pathname resolution of a symbolic link produced an intermediate result whoselength exceeds {PATH_MAX}.</dl></blockquote><h4><a name = "tag_000_007_647"> </a>EXAMPLES</h4><blockquote>None.</blockquote><h4><a name = "tag_000_007_648"> </a>APPLICATION USAGE</h4><blockquote>For portability to implementations conforming to earlier versions of thisspecification,<i><a href="mkfifo.html">mkfifo()</a></i>is preferred over this function for making FIFO special files.</blockquote><h4><a name = "tag_000_007_649"> </a>FUTURE DIRECTIONS</h4><blockquote>None.</blockquote><h4><a name = "tag_000_007_650"> </a>SEE ALSO</h4><blockquote><i><a href="chmod.html">chmod()</a></i>,<i><a href="creat.html">creat()</a></i>,<i><a href="exec.html">exec</a></i>,<i><a href="mkdir.html">mkdir()</a></i>,<i><a href="mkfifo.html">mkfifo()</a></i>,<i><a href="open.html">open()</a></i>,<i><a href="stat.html">stat()</a></i>,<i><a href="umask.html">umask()</a></i>,<i><a href="sysstat.h.html"><sys/stat.h></a></i>.</blockquote><hr size=2 noshade><center><font size=2>UNIX ® is a registered Trademark of The Open Group.<br>Copyright © 1997 The Open Group<br> [ <a href="../index.html">Main Index</a> | <a href="../xshix.html">XSH</a> | <a href="../xcuix.html">XCU</a> | <a href="../xbdix.html">XBD</a> | <a href="../cursesix.html">XCURSES</a> | <a href="../xnsix.html">XNS</a> ]</font></center><hr size=2 noshade></body></html>⌨️ 快捷键说明
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