1 /*
2  *  catrw.c  --  open a file with O_RDWR and print it.
3  *
4  *  This program is free software; you can redistribute it and/or modify
5  *  it under the terms of the GNU General Public License as published by
6  *  the Free Software Foundation; either version 2 of the License, or
7  *  (at your option) any later version.
8  *
9  */
10 #include <stdio.h>
11 #include <stdlib.h>
12 #include <string.h>
13 #include <fcntl.h>
14 #include <unistd.h>
15 #include <errno.h>
16 
17 #define BUFSIZE 4096
18 char buf[BUFSIZE];
19 
catrw(int fd)20 void catrw(int fd) {
21     int i;
22     for (;;) {
23 	while ( (i = read(fd, buf, BUFSIZE)) < 0 && errno == EINTR)
24 	    ;
25 	if (i <= 0)
26 	    break;
27 	write(1, buf, i);
28     }
29 }
30 
main(int argc,char * argv[])31 int main(int argc, char *argv[]) {
32     int fd;
33     if (argc == 1)
34 	catrw(0);
35     else {
36 	while (--argc && (fd = open(*++argv, O_RDWR))) {
37 	    catrw(fd);
38 	    close(fd);
39 	}
40     }
41     return 0;
42 }
43 
44