3 * Copyright (C) 2007 Simone Piccardi
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation; either version 2 of the License, or (at
8 * your option) any later version.
10 * This program is distributed in the hope that it will be useful, but
11 * WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * General Public License for more details.
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
19 /****************************************************************
22 * A sample program that copy a file using splice
24 * Author: Simone Piccardi
27 ****************************************************************/
29 * Include needed headers
32 #include <fcntl.h> /* file control functions */
33 #include <unistd.h> /* unix standard library */
34 #include <stdlib.h> /* C standard library */
35 #include <errno.h> /* error definitions and routines */
36 #include <stdio.h> /* standard I/O library */
37 #include <string.h> /* C strings library */
38 #include <sys/stat.h> /* file characteristics constants and functions */
39 #include <sys/types.h> /* primitive system data types */
44 * Function and globals definitions
46 void usage(void); /* Help printing routine */
51 int main(int argc, char *argv[])
54 * Variables definition
62 * Input section: decode command line parameters
65 opterr = 0; /* don't want writing to stderr */
66 while ( (i = getopt(argc, argv, "hs:")) != -1) {
71 case 'h': /* help option */
72 printf("Wrong -h option use\n");
76 case 's': /* take wait time for childen */
77 size = strtol(optarg, NULL, 10); /* convert input */
79 case '?': /* unrecognized options */
80 printf("Unrecognized options -%c\n", optopt);
82 default: /* should not reached */
89 if ((argc - optind) != 2) { /* There must two argument */
90 printf("Wrong number of arguments %d\n", argc - optind);
93 /* open pipe, input and output file */
94 if (pipe(pipefd) == -1) {
95 perror("Cannot create buffer pipe");
98 in_fd = open(argv[optind], O_RDONLY);
100 printf("Input error %s on %s\n", strerror(errno), argv[optind]);
103 out_fd = open(argv[optind+1], O_CREAT|O_RDWR|O_TRUNC, 0644);
105 printf("Cannot open %s, error %s\n", argv[optind+1], strerror(errno));
109 debug("Size %d\n", size);
111 nread = splice(in_fd, NULL, pipefd[1], NULL, size, 0);
112 debug("read %d bytes\n", nread);
113 if (nread == 0) break;
115 if (errno == EINTR) {
118 perror("read error");
123 nwrite = splice(pipefd[0], NULL, out_fd, NULL, nread, 0);
124 debug("write %d bytes\n", nwrite);
125 if (nwrite == 0) continue;
130 perror("write error");
135 debug("left %d bytes\n", nread);
144 * routine to print usage info and exit
147 printf("Program splicecp: copy two file using splice syscall\n");
149 printf(" splicecp [-h] [-s N] filesrc filedst \n");
150 printf(" -h print this help\n");
151 printf(" -s N set a buffer size of N bytes \n");