Attachment 2393 Details for Bug 4527 – Trivial sendfile(2) program

Trivial sendfile(2) program

sendfile.c (text/plain), 1.60 KB, created by Dan Merillat on 2007-04-19 21:09:24 UTC

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Creator: Dan Merillat

Created: 2007-04-19 21:09:24 UTC

Size: 1.60 KB

patch

obsolete

>#include <sys/sendfile.h>
>#include <sys/types.h>
>#include <sys/stat.h>
>#include <sys/poll.h>
>#include <sys/socket.h>
>#include <fcntl.h>
>#include <unistd.h>
>#include <stdlib.h>
>#include <errno.h>
>#include <stdio.h>
>#include <string.h>
>
>int transmit(int ifd, int ofd) {
>	struct stat sbuf;
>	off_t offset=0;
>	int res;
>
>	
>	fstat(ifd, &sbuf);
>	printf("Transmitting testfile - size %d\n", sbuf.st_size);
>	res=sendfile(ofd, ifd, &offset, sbuf.st_size);
>	if (res>0)
>		printf("Transmitted %d bytes - offset %d\n", res, offset);
>	else {
>		printf("sendfile() =  %d %s (@%d)\n", res, strerror(errno), offset);
>		fflush(stdout);
>	}
>	fflush(stdout);
>
>
>	close(ifd);
>}
>
>int receive(int ifd) {
>	struct pollfd pfd[1];
>	int rdsize;
>	int rdtotal=0;
>	char *rbuf=0;
>
>	rbuf=malloc(64 * 1024); // 64k reads.
>
>	pfd[0].fd=ifd;
>	pfd[0].events=POLLIN;
>
>	while(1) {
>		poll(pfd, 1, -1);
>		if (pfd->revents & POLLIN) {
>			while(1) {
>			rdsize=read(ifd, rbuf, 64*1024);
>				if (rdsize <= 0)
>					break;
>				rdtotal+=rdsize;
>			}
>			if (0==rdsize)
>				break;
>		}
>	}
>	printf("Read %d bytes.\n", rdtotal);
>	free(rbuf);
>}
>
>
>int main(int argc, char ** argv) {
>
>	int child_pid;
>	int ret;
>
>	int ifd;
>
>	int sv[2];
>
>	ret=socketpair(AF_UNIX, SOCK_STREAM, 0, sv);
>
>	if (argc>1) {
>		ifd=open(argv[1], O_RDONLY, 0);
>		if (ifd<0) {
>			printf("File not found: %s\n", argv[1]);
>			exit(1);
>		}
>	} else {
>		printf("usage: %s <filename>\n", argv[0]);
>		exit(0);
>	}
>
>	if ((child_pid = fork()) == -1)
>		perror("forking");
>	else if (child_pid==0) {
>		close(sv[0]);
>		receive(sv[1]);
>		exit(0);
>	}
>
>		
>
>	close(sv[1]);
>	transmit(ifd, sv[0]);
>	close(sv[0]);
>	waitpid(child_pid, 0, 0);
>	
>	exit(0);
>}

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Attachments on bug 4527: 2393