int
main(
int
argc, char
*argv
[]){
int
fd1, fd2;
int
count, count2; char buffer[
1024
] =
{0}
; char
*ptr
;
if
(argc !=
3
) {
printf
(
"Usage: %s file1 file2\n"
, argv[
0
]);
return
1
; }
if
(-
1
== (fd1 =
open
(argv[
1
], O_RDONLY))) { perror(
"open file1\n"
);
close
(fd1);
return
2
; }
if
(-
1
== (fd2 =
open
(argv[
2
], O_WRONLY | O_CREAT, S_IRUSR | S_IWUSR))) { perror(
"open file2\n"
);
close
(fd2);
return
3
; }
while
(count =
read
(fd1, buffer,
1024
)) {
if
(-
1
== count) { perror(
"read"
);
return
4
; } ptr = buffer;
int
count2 =
write
(fd2, ptr, count);
if
(-
1
== count2) { perror(
"write\n"
);
return
5
; } memset(buffer,
0
,
1024
); }
close
(fd1);
close
(fd2);
return
0
;}
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