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libowfat/io/io_sendfile.c

58 lines
1.2 KiB

#define _FILE_OFFSET_BITS 64
#include "io_internal.h"
#if defined(__FreeBSD__) || defined(__OpenBSD__) || defined(__NetBSD__)
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/uio.h>
int64 io_sendfile(int64 s,int64 fd,uint64 off,uint64 n) {
off_t sbytes;
int r=sendfile(fd,s,off,n,0,&sbytes,0);
if (r==0) return n;
if (r==-1)
return (errno==EAGAIN?sbytes:-1);
}
#elif defined(__linux__)
#if defined(__GLIBC__)
#include <sys/sendfile.h>
#elif defined(__dietlibc__)
#include <sys/sendfile.h>
#else
#include <linux/unistd.h>
_syscall4(int,sendfile,int,out,int,in,long *,offset,unsigned long,count)
#endif
int64 io_sendfile(int64 s,int64 fd,uint64 off,uint64 n) {
off_t o=off;
return sendfile(s,fd,&o,n);
}
#else
#define BUFSIZE 16384
int64 io_sendfile(int64 out,int64 in,uint64 off,uint64 bytes) {
char buf[BUFSIZE];
int n,m;
uint64 sent=0;
if (lseek(in,off,SEEK_SET) != off)
return -1;
while (bytes>0) {
char* tmp=buf;
if ((n=read(in,tmp,(bytes<BUFSIZE)?bytes:BUFSIZE))<=0)
return (sent?sent:-1);
while (n>0) {
if ((m=write(out,tmp,n))<0)
goto abort;
sent+=m;
n-=m;
tmp+=m;
}
}
abort:
return sent;
}
#endif