73 lines
1.5 KiB
C
73 lines
1.5 KiB
C
#include <stdio.h>
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#include <unistd.h>
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#include <stdlib.h>
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#include <sys/wait.h>
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#include <string.h>
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#include <fcntl.h>
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#include <errno.h>
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#define BUFFSIZE 8
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int main() {
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extern int errno;
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char file_read[] = "f_read.txt";
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char file_write[] = "f_write.txt";
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char buffer[BUFFSIZE];
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bzero(buffer, sizeof(buffer));
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// opening files
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int desc_fr = open(file_read, O_RDONLY);
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if (desc_fr < 0) {
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perror("ERROR opening f_read.txt");
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exit(errno);
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}
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int desc_fw = open(file_write, O_WRONLY | O_CREAT | O_TRUNC, 0640);
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if (desc_fw < 0) {
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perror("ERROR opening f_write.txt");
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exit(errno);
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}
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// reading and writing to buffer
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int ret_write = 0;
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int ret_read = BUFFSIZE;
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while (ret_read == BUFFSIZE) {
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ret_read = read(desc_fr, buffer, BUFFSIZE);
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if (ret_read < 0) {
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perror("ERROR reading f_read.txt");
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exit(errno);
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}
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printf("[%d] %.*s\n", ret_read, ret_read, buffer);
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ret_write = write(desc_fw, buffer, ret_read);
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if (ret_write < 0) {
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perror("ERROR writing to f_write.txt");
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exit(errno);
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}
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bzero(buffer, sizeof(buffer));
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}
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// closing files
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int ret_close = 0;
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ret_close = close(desc_fr);
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if (ret_close < 0) {
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perror("ERROR closing f_read.txt");
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exit(errno);
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}
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close(desc_fw);
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if (ret_close < 0) {
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perror("ERROR closing f_write.txt");
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exit(errno);
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}
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return EXIT_SUCCESS;
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}
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