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#ifndef _GNU_SOURCE
#define _GNU_SOURCE
#endif
#include "config.h"
#include "fileio.h"
#include "acbuf.h"
#include "acfg.h"
#include <fcntl.h>
#ifdef HAVE_LINUX_FALLOCATE
#include <linux/falloc.h>
#endif
using namespace std;
namespace acng
{
#ifdef DISABLED_FOR_NOW
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
*/
ssize_t sendfile_generic(int out_fd, int in_fd, off_t *offset, size_t count)
{
char buf[8192];
ssize_t totalcnt=0;
if(!offset)
{
errno=EFAULT;
return -1;
}
if(lseek(in_fd, *offset, SEEK_SET)== (off_t)-1)
return -1;
while(count>0)
{
auto maxlen=sizeof(buf);
if(count<maxlen) maxlen=count;
auto readcount=read(in_fd, buf, maxlen);
if(readcount<=0)
{
if(errno==EINTR || errno==EAGAIN)
continue;
else
return readcount;
}
*offset+=readcount;
totalcnt+=readcount;
count-=readcount;
for(decltype(readcount) nPos(0);nPos<readcount;)
{
auto r=write(out_fd, buf+nPos, readcount-nPos);
if(r==0) continue; // not nice but needs to deliver it
if(r<0)
{
if(errno==EAGAIN || errno==EINTR)
continue;
return r;
}
nPos+=r;
}
}
return totalcnt;
}
bool xtouch(cmstring &wanted)
{
mkbasedir(wanted);
int fd = open(wanted.c_str(), O_WRONLY|O_CREAT|O_NOCTTY|O_NONBLOCK, cfg::fileperms);
if(fd == -1)
return false;
checkforceclose(fd);
return true;
}
void mkbasedir(cmstring & path)
{
if(0==mkdir(GetDirPart(path).c_str(), cfg::dirperms) || EEXIST == errno)
return; // should succeed in most cases
// assuming the cache folder is already there, don't start from /, if possible
unsigned pos=0;
if(startsWith(path, cfg::cacheDirSlash))
{
// pos=acng::cfg:cachedir.size();
pos=path.find("/", cfg::cachedir.size()+1);
}
for(; pos<path.size(); pos=path.find(SZPATHSEP, pos+1))
{
if(pos>0)
mkdir(path.substr(0,pos).c_str(), cfg::dirperms);
}
}
void mkdirhier(cmstring& path)
{
if(0==mkdir(path.c_str(), cfg::dirperms) || EEXIST == errno)
return; // should succeed in most cases
if(path.empty())
return;
for(cmstring::size_type pos = path[0] == '/' ? 1 : 0;pos < path.size();pos++)
{
pos = path.find('/', pos);
mkdir(path.substr(0,pos).c_str(), cfg::dirperms);
if(pos == stmiss) break;
}
}
}
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