fcopy.c

嵌入式Linux程序设计与应用案例 电子书源码 中国电力出版社

/*************
//name :fcopy.c
//author : pyy
//date : 2007-10-22
***************/

#include<unistd.h>
#include<sys/types.h>
#include<sys/stat.h>
#include<fcntl.h>
#include<stdlib.h>
#include<stdio.h>

int main()
{
    int  fdsrc, fddes, nbytes;
    int  flags=O_CREAT | O_TRUNC | O_WRONLY;
    int  z;
    char buf[20],mysrc[20],mydes[20];
    printf(" input your source file: ");
    scanf("%s",mysrc);
    printf(" input your target file:");
    scanf("%s",mydes);
    fdsrc = open(mysrc , O_RDONLY);
    if (fdsrc <0 )
    {
        perror("write des file");
        exit(1);
    }
    fddes = open(mydes, flags, 0644);
    if( fddes<0 )
    {
        perror("open des file"); exit(1);

    }
    while( ( nbytes = read(fdsrc,buf,20))>0 )
    {
        z = write(fddes,buf,nbytes);
        if( z < 0)
        {
            perror("write des file.");
        } 
    }  /* while  */

    close(fdsrc);
    close(fddes);
    exit(0);

}