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120 lines
2.4 KiB
C
120 lines
2.4 KiB
C
#define _FILE_OFFSET_BITS 64
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#include "io_internal.h"
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#include "havebsdsf.h"
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#if defined(HAVE_BSDSENDFILE)
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <sys/uio.h>
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int64 io_sendfile(int64 s,int64 fd,uint64 off,uint64 n) {
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off_t sbytes;
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int r=sendfile(fd,s,off,n,0,&sbytes,0);
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if (r==-1)
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return (errno==EAGAIN?(sbytes?sbytes:-1):-3);
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return n;
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}
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#elif defined(__linux__)
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#if defined(__GLIBC__)
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#include <sys/sendfile.h>
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#elif defined(__dietlibc__)
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#include <sys/sendfile.h>
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#else
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#include <linux/unistd.h>
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_syscall4(int,sendfile,int,out,int,in,long *,offset,unsigned long,count)
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#endif
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int64 io_sendfile(int64 s,int64 fd,uint64 off,uint64 n) {
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off_t o=off;
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io_entry* e=array_get(&io_fds,sizeof(io_entry),s);
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off_t i=sendfile(s,fd,&o,n);
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if (i==-1) {
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if (e) {
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e->canwrite=0;
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e->next_write=-1;
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}
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if (errno!=EAGAIN) i=-3;
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}
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return i;
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}
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#else
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#include <unistd.h>
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#include <sys/mman.h>
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#define BUFSIZE 16384
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int64 io_sendfile(int64 out,int64 in,uint64 off,uint64 bytes) {
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char buf[BUFSIZE];
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int n,m;
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uint64 sent=0;
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io_entry* e=array_get(&io_fds,sizeof(io_entry),out);
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if (e) {
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const char* c;
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long left;
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do {
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if (e->mmapped) {
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/* did we already map the right chunk? */
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if (off>=e->mapofs && off<e->mapofs+e->maplen)
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goto mapok; /* ok; mmapped the right chunk*/
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munmap(e->mmapped,e->maplen);
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}
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e->mapofs=off&0xffffffffffff0000ull;
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if (e->mapofs+0x10000>off+bytes)
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e->maplen=off+bytes-e->mapofs;
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else
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e->maplen=0x10000;
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if ((e->mmapped=mmap(0,e->maplen,PROT_READ,MAP_SHARED,in,e->mapofs))==MAP_FAILED) {
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e->mmapped=0;
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goto readwrite;
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}
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mapok:
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c=(const char*)(e->mmapped)+(off&0xffff);
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left=e->maplen-(off&0xffff);
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while (left>0) {
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m=write(out,c,left);
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if (m==-1) {
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e->canwrite=0;
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e->next_write=-1;
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return errno==EAGAIN?(sent?sent:-1):-3;
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}
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if (m==0) return sent;
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sent+=m;
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left-=m;
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bytes-=m;
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off+=m;
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}
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} while (bytes);
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return sent;
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}
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readwrite:
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if (lseek(in,off,SEEK_SET) != off)
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return -1;
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while (bytes>0) {
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char* tmp=buf;
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if ((n=read(in,tmp,(bytes<BUFSIZE)?bytes:BUFSIZE))<=0)
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return (sent?sent:-1);
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while (n>0) {
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if ((m=write(out,tmp,n))<0) {
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if (m==-1) {
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if (e) {
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e->canwrite=0;
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e->next_write=-1;
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}
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return errno==EAGAIN?(sent?sent:-1):-3;
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}
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goto abort;
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}
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sent+=m;
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n-=m;
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tmp+=m;
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}
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}
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abort:
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return sent;
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}
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#endif
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