linux-shell/1 – FMI Tasks/C/Task 01 (append - O_APPEND).c at master · andy489/linux-shell

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// github.com/andy489

#include <stdlib.h>

#include <err.h>

#include <errno.h>

#include <sys/stat.h>

#include <sys/types.h>

#include <fcntl.h>

#include <unistd.h>

#include <stdio.h>

int main(int argc, char** argv){

if(argc != 3) errx(1,"usage: %s file1.txt file2.txt", argv[0]);

int fd1 = -1, fd2 = -1;

const char *f1 = argv[1], *f2 = argv[2];

if((fd1 = open(f1, O_RDONLY)) == -1){

err(2,"error while opening %s", f1);

}

if((fd2 = open(f2, O_APPEND | O_WRONLY | O_EXCL)) == -1){

int _errno=errno;

close(fd1);

errno=_errno;

err(3,"error while opening %s", f2);

}

char c[2<<11];

int read_sz = -1;

while((read_sz=read(fd1, &c, sizeof(c))) > 0){

if(read_sz == -1){

int _errno=errno;

close(fd1);

close(fd2);

errno=_errno;

err(4,"error while reading %s", f1);

}

int wr = write(fd2, &c, read_sz);

if(wr == -1){

int _errno=errno;

close(fd1);

close(fd2);

errno=_errno;

err(5,"error while writing %s", f2);

}

close(fd1);

close(fd2);

exit(0);

}

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Task 01 (append - O_APPEND).c

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