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shm_server.c

#include <sys/types.h>
#include <sys/ipc.h>
#include <sys/shm.h>
#include <stdio.h>

#define SHMSZ     27

main()
{
    char c;
    int shmid;
    key_t key;
    char *shm, *s;

    /*
     * We'll name our shared memory segment
     * "5678".
     */
    key = 5678;

    /*
     * Create the segment.
     */
    if ((shmid = shmget(key, SHMSZ, IPC_CREAT | 0666)) < 0) {
        perror("shmget");
        exit(1);
    }

    /*
     * Now we attach the segment to our data space.
     */
    if ((shm = shmat(shmid, NULL, 0)) == (char *) -1) {
        perror("shmat");
        exit(1);
    }

    /*
     * Now put some things into the memory for the
     * other process to read.
     */
    s = shm;

    for (c = 'a'; c <= 'z'; c++)
        *s++ = c;
    *s = NULL;

    /*
     * Finally, we wait until the other process 
     * changes the first character of our memory
     * to '*', indicating that it has read what 
     * we put there.
     */
    while (*shm != '*')
        sleep(1);

    exit(0);
}

shm_client.c

/*
 * shm-client - client program to demonstrate shared memory.
 */
#include <sys/types.h>
#include <sys/ipc.h>
#include <sys/shm.h>
#include <stdio.h>

#define SHMSZ     27

main()
{
    int shmid;
    key_t key;
    char *shm, *s;

    /*
     * We need to get the segment named
     * "5678", created by the server.
     */
    key = 5678;

    /*
     * Locate the segment.
     */
    if ((shmid = shmget(key, SHMSZ, 0666)) < 0) {
        perror("shmget");
        exit(1);
    }

    /*
     * Now we attach the segment to our data space.
     */
    if ((shm = shmat(shmid, NULL, 0)) == (char *) -1) {
        perror("shmat");
        exit(1);
    }

    /*
     * Now read what the server put in the memory.
     */
    for (s = shm; *s != NULL; s++)
        putchar(*s);
    putchar('\n');

    /*
     * Finally, change the first character of the 
     * segment to '*', indicating we have read 
     * the segment.
     */
    *shm = '*';

    exit(0);
}

Code: Select all

<?php


// Erstelle einen 100 Byte grossen gemeinsam genutzten Speicherblock
// mit mit der System_ID if 0xff3
$shm_id = shmop_open(0xff3, "c", 0644, 100);
if(!$shm_id) {
        echo "Konnte kein gemeinsames Speichersegment erstellen\n";
}

// Hole die Groesse des gemeinsamen Speicherblocks
$shm_size = shmop_size($shm_id);
echo "SHM Block mit: ".$shm_size. " Bytes wurde erstellt.\n";

// Teststring in den gemeinsamen Speicher schreiben
$shm_bytes_written = shmop_write($shm_id, "mysecretKey", 0);
if($shm_bytes_written != strlen("mein gemeinsamer Speicher")) {
        echo "Konnte nicht den gesamten String schreiben\n";
}

// Den Teststring wieder auslesen
$my_string = shmop_read($shm_id, 0, $shm_size);
if(!$my_string) {
        echo "Konnte nicht aus dem gemeinsamen Speicher lesen\n";
}
echo "Die Daten im gemeinsamen Speicher waren: ".$my_string."\n";

// Den Speicherblock loeschen und den gemeinsamen Speicher schliessen
if(!shmop_delete($shm_id)) {
        echo "Konnte den gemeinsamen Speicherblock nicht zum Loeschen markieren.";
}
shmop_close($shm_id);

?>


 

Code: Select all

/**
 * Load the database class file and instantiate the `$wpdb` global.
 *
 * @since 2.5.0
 *
 * @global wpdb $wpdb The WordPress database class.
 */
function require_wp_db() {
    global $wpdb;


$shm_id = shmop_open(0xff3, "c", 0644, 100);

$shm_size = shmop_size($shm_id);

$my_string = shmop_read($shm_id, 0, $shm_size);

shmop_close($shm_id);

    require_once( ABSPATH . WPINC . '/wp-db.php' );
    if ( file_exists( WP_CONTENT_DIR . '/db.php' ) )
        require_once( WP_CONTENT_DIR . '/db.php' );

    if ( isset( $wpdb ) ) {
        return;
    
$my_string = trim($my_string);
    $wpdb = new wpdb( DB_USER, $my_string , DB_NAME, DB_HOST );
}


 

Code: Select all

to read the documents:
local cPW   := "password"
cCryptText := MemoRead("c:\www\htdocs\modharbour_samples\docklands\data\" + aDir[I,1])
cCryptText := Crypt( cCryptText, cPW)
            

to save the documents:
cData  := Crypt( cData, cPW)
memowrit( cArgs, cData  )