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Date: Wed, 16 Oct 2002 10:49:08 +0200
From: Zilvinas Valinskas <zilvinas@gemtek.lt>
To: linux-kernel@vger.kernel.org
Subject: sendfile(2) behaviour has changed ?
Message-ID: <20021016084908.GA770@gemtek.lt>
Reply-To: Zilvinas Valinskas <zilvinas@gemtek.lt>
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This sample code copies a file using sendfile(2) call works just fine on 
2.2.x and 2.4.x kernels. On 2.5.x kernels (not sure starting which
version) it stopped working. Program terminates with EINVAL error. 

$ ./sendfile
sendfile: Invalid argument

Is this expected behaviour ? that sendfile(2) on 2.5.4x linux kernel requires
socket as an output fd paramter ? 

Was it ever legal to copy file(s) on filesystem using sendfile(2) ?
(which was kindda nice feature ... )

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#include <sys/sendfile.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>

int main() 
{
	int fd_in  = 0;
	int fd_out = 0;
	struct stat stat_buf;
	off_t  offset = 0;
	ssize_t count = 0;

	if ((fd_in=open("sendfile.c",O_RDONLY))<0)
	{
		perror("open");
		exit(1);
	}
	if ((fd_out=open("sendfile.out",O_CREAT|O_TRUNC|O_WRONLY,S_IRWXU))<0)
	{
		perror("open");
		exit(1);
	}

	if (fstat(fd_in,&stat_buf)) {
		perror("fstat");
	}


	count = sendfile(fd_out,fd_in,&offset,stat_buf.st_size);

	if (count < 0)
		perror("sendfile");
	
	if (close(fd_in) < 0)
		perror("close");
	if (close(fd_out) < 0)
		perror("close");
	return 0;
}


--y0ulUmNC+osPPQO6--
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