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#ifndef _GNU_SOURCE
#define _GNU_SOURCE
#endif
#include "config.h"
#include "fileio.h"
#include "acbuf.h"
#ifdef HAVE_LINUX_FALLOCATE
#include <linux/falloc.h>
#include <fcntl.h>
int falloc_helper(int fd, off_t start, off_t len)
{
return fallocate(fd, FALLOC_FL_KEEP_SIZE, start, len);
}
#else
int falloc_helper(int, off_t, off_t)
{
return 0;
}
#endif
// linking not possible? different filesystems?
bool FileCopy_generic(cmstring &from, cmstring &to)
{
acbuf buf;
buf.setsize(50000);
int in(-1), out(-1);
in=::open(from.c_str(), O_RDONLY);
if (in<0) // error, here?!
return false;
while (true)
{
int err;
err=buf.sysread(in);
if (err<0)
{
if (err==-EAGAIN || err==-EINTR)
continue;
else
goto error_copying;
}
else if (err==0)
break;
// don't open unless the input is readable, for sure
if (out<0)
{
out=open(to.c_str(), O_WRONLY | O_CREAT | O_TRUNC, 00644);
if (out<0)
goto error_copying;
}
err=buf.syswrite(out);
if (err<=0)
{
if (err==-EAGAIN || err==-EINTR)
continue;
else
goto error_copying;
}
}
forceclose(in);
forceclose(out);
return true;
error_copying:
checkforceclose(in);
checkforceclose(out);
return false;
}
/*
#if defined(HAVE_LINUX_SPLICE) && defined(HAVE_PREAD)
bool FileCopy(cmstring &from, cmstring &to)
{
int in(-1), out(-1);
in=::open(from.c_str(), O_RDONLY);
if (in<0) // error, here?!
return false;
// don't open target unless the input is readable, for sure
uint8_t oneByte;
ssize_t err = pread(in, &oneByte, 1, 0);
if (err < 0 || (err == 0 && errno != EINTR))
{
forceclose(in);
return false;
}
out = open(to.c_str(), O_WRONLY | O_CREAT | O_TRUNC, 00644);
if (out < 0)
{
forceclose(in);
return false;
}
return FileCopy_generic(from, to);
}
#endif
*/
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