226 lines
9.6 KiB
HTML
226 lines
9.6 KiB
HTML
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<?xml version="1.0" encoding="UTF-8"?>
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<!DOCTYPE html
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PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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<html lang="en-us" xml:lang="en-us">
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
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<meta name="security" content="public" />
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<meta name="Robots" content="index,follow" />
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<meta http-equiv="PICS-Label" content='(PICS-1.1 "http://www.icra.org/ratingsv02.html" l gen true r (cz 1 lz 1 nz 1 oz 1 vz 1) "http://www.rsac.org/ratingsv01.html" l gen true r (n 0 s 0 v 0 l 0) "http://www.classify.org/safesurf/" l gen true r (SS~~000 1))' />
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<meta name="DC.Type" content="reference" />
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<meta name="DC.Title" content="Examples: Integrated file system" />
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<meta name="abstract" content="These examples can help you program your optical file system using the integrated file system." />
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<meta name="description" content="These examples can help you program your optical file system using the integrated file system." />
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<meta name="DC.Relation" scheme="URI" content="ifs.htm" />
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<meta name="copyright" content="(C) Copyright IBM Corporation 2000, 2006" />
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<meta name="DC.Rights.Owner" content="(C) Copyright IBM Corporation 2000, 2006" />
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<meta name="DC.Format" content="XHTML" />
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<meta name="DC.Identifier" content="ifsexamples" />
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<meta name="DC.Language" content="en-us" />
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<!-- All rights reserved. Licensed Materials Property of IBM -->
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<!-- US Government Users Restricted Rights -->
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<!-- Use, duplication or disclosure restricted by -->
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<!-- GSA ADP Schedule Contract with IBM Corp. -->
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<link rel="stylesheet" type="text/css" href="./ibmdita.css" />
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<link rel="stylesheet" type="text/css" href="./ic.css" />
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<title>Examples: Integrated file system</title>
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</head>
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<body id="ifsexamples"><a name="ifsexamples"><!-- --></a>
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<!-- Java sync-link --><script language="Javascript" src="../rzahg/synch.js" type="text/javascript"></script>
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<h1 class="topictitle1">Examples: Integrated file system</h1>
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<div><p>These examples can help you program your optical file system using
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the integrated file system.</p>
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<div class="section"><p>This topic demonstrates the use of the integrated file system
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UNIX-type APIs that pertain to the QOPT physical file system and are used
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with the ILE C for i5/OS™ programming language.</p>
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<div class="p">The
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programming examples demonstrate the following functions: <ul><li>Retrieving optical directory entries</li>
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<li>Creating an optical file</li>
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<li>Writing a file</li>
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<li>Closing a file</li>
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<li>Opening a file</li>
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<li>Reading a file</li>
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<li>Changing the offset into a file</li>
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</ul>
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</div>
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<p>For more information about UNIX-Type APIs, see the <a href="../apis/unix.htm">UNIX-Type APIs</a> topic in the iSeries™ Information
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Center.</p>
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</div>
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<div class="example"><h4 class="sectiontitle">Sample code</h4>This sample program demonstrates the use
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of various integrated file system APIs. <div class="note"><span class="notetitle">Note:</span> By using the following code
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examples, you agree to the terms of the <a href="codedisclaimer.htm">Code license and disclaimer information</a>.</div>
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<pre>/**********************************************************************/
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/* */
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/* This program demonstrates the use of various integrated file */
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/* system functions applied to the QOPT physical file system */
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/* including: */
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/* chdir() - change current directory */
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/* close() - close file */
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/* closedir() - close directory */
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/* creat() - create file */
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/* lseek() - seek file (change file offset) */
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/* open() - open file */
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/* opendir() - open directory */
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/* read() - read file */
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/* readdir() - read directory entry */
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/* rewinddir() - rewind directory entries */
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/* stat() - directory statistics */
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/* write() - write file */
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/* */
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/**********************************************************************/
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#include <stdio.h>
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#include <unistd.h>
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#include <sys/types.h>
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#include <dirent.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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void main (void)
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{
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/*****************************************************************/
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/* local variables, contents and defines */
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/*****************************************************************/
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char path[294]; /* optical path */
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DIR *dirP; /* pointer to the directory */
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int filedes; /* open file descriptor */
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struct dirent *direntP; /* directory entry structure */
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struct stat info; /* dir/file information */
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int volume_number; /* what it says... */
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int rc = 0; /* function return codes */
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int kk = 0; /* local counter */
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char data[] = "The quick red fox jumped over the fence";
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/*****************************************************************/
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/* Retrieve the list of volumes from the QOPT physical file */
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/* system by opening the QOPT pfs root directory and reading the */
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/* directory entries. */
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/*****************************************************************/
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memset(path, /* clear path name */
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0x00,
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sizeof(path));
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strcpy(path, /* set physical file system */
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"/QOPT");
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rc = stat("/QOPT", &info);; /* determine number of files */
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if (rc != 0)
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perror("stat() failed:");
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dirP = opendir(path); /* open the directory */
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if (dirP == NULL)
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perror("opendir() failed:");
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for (kk = 1; kk <= info.st_nlink; kk++)
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{
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direntP = readdir(dirP);
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if (direntP == NULL)
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perror("readdir() failed:");
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printf("%d) %s\n", kk, direntP->d_name);
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}
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/*****************************************************************/
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/* Prompt user for the volume they want to work with and make it */
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/* the current directory. */
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/*****************************************************************/
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printf("\nEnter the number the volume you want to work with:\n");
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scanf("%d", &volume_number);;
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rewinddir(dirP); /* beginning of directory */
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for (kk = 1; kk <= volume_number; kk++)
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direntP = readdir(dirP); /* get requested dir. entry */
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strcat(path, "/");
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strcat(path, direntP->d_name);
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rc = chdir(path); /* set current working dir. */
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if (rc != 0)
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perror("chdir() failed:");
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if (getcwd(path, sizeof(path)) == NULL)
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perror("getcwd() failed:");
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printf("\nThe current working directory is: %s\n", path);
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rc = closedir(dirP); /* close the directory */
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if (rc != 0)
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perror("closedir() failed:");
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/*****************************************************************/
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/* Create and open a file write only. If the file exists it */
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/* will be truncated. The owner will have read, write, and */
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/* execute authority to the file. */
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/*****************************************************************/
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strcat(path, "/");
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printf("\nEnter a file name:\n");
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scanf("%s", &path[strlen(path)]);
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filedes = creat(path, S_IRWXU);
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if (filedes == -1)
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{
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perror("creat() failed");
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return;
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}
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rc = write(filedes, data, sizeof(data));
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if (rc == -1)
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perror("write() failed:");
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close(filedes);
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/*****************************************************************/
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/* Read back the file and print it. */
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/*****************************************************************/
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memset(data, 0x00, sizeof(data));
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filedes = open(path, O_RDWR);
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if (filedes == -1)
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{
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perror("open() failed");
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return;
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}
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read(filedes, data, sizeof(data));
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if (filedes == -1)
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{
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perror("read() failed");
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return;
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}
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printf("\nThe data written to file is: %s\n", data);
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/*****************************************************************/
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/* Change the offset into the file and change part of it. Read */
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/* the entire file, print it out and close the file. */
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/*****************************************************************/
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lseek(filedes, 4, SEEK_SET);
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rc = write(filedes, "slow old ", 9);
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if (rc == -1)
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{
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perror("write() failed");
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return;
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}
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lseek(filedes, 18, SEEK_SET);
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rc = write(filedes, "went under ", 11);
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if (rc == -1)
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{
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perror("write() failed");
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return;
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}
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lseek(filedes, 0, SEEK_SET);
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read(filedes, data, sizeof(data));
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if (filedes == -1)
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{
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perror("read() failed");
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return;
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}
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printf("\nThe data now is: %s\n", data);
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close(filedes);
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printf("Done...\n");
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return;
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}</pre>
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</div>
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</div>
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<div>
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<div class="familylinks">
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<div class="parentlink"><strong>Parent topic:</strong> <a href="ifs.htm" title="Read this topic collection to learn how to use UNIX-type APIs to program your optical file system.">Integrated file system programming</a></div>
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</div>
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</div>
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</body>
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</html>
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