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91 lines
2.0 KiB
C
91 lines
2.0 KiB
C
#if defined(__FreeBSD__) || defined(__OpenBSD__) || defined(__NetBSD__)
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#define BSD_SENDFILE
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#endif
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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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#include <errno.h>
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#ifdef __linux__
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#include <alloca.h>
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#endif
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#include "iob_internal.h"
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int64 iob_send(int64 s,io_batch* b) {
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io_entry* e,* last;
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struct iovec* v;
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int64 sent;
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long i;
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long headers;
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#ifdef BSD_SENDFILE
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long trailers;
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#endif
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if (b->bytesleft==0) return 0;
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last=array_start(&b->b)+array_bytes(&b->b);
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v=alloca(b->bufs*sizeof(struct iovec));
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for (;;) {
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if (!(e=array_get(&b->b,sizeof(io_entry),b->next)))
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return -1; /* can't happen error */
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#ifdef BSD_SENDFILE
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/* BSD sendfile can send headers and trailers. If we run on BSD, we
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* should try to exploit this. */
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headers=trailers=0;
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#endif
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for (i=0; e+i<last; ++i) {
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if (e[i].type==FROMFILE) break;
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v[i].iov_base=e[i].buf+e[i].offset;
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v[i].iov_len=e[i].n-e[i].offset;
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}
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headers=i;
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#ifdef BSD_SENDFILE
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if (e[i].type==FROMFILE) {
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off_t sbytes;
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struct sf_hdtr hdr;
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int r;
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for (++i; e+i<last; ++i) {
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if (e[i].type==FROMFILE) break;
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v[i-1].iov_base=e[i].buf+e[i].offset;
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v[i-1].iov_len=e[i].n-e[i].offset;
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++trailers;
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}
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hdr.headers=v; hdr.hdr_cnt=headers;
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hdr.trailers=v+headers; hdr.trl_cnt=trailers;
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r=sendfile(e[headers].fd,s,e[headers].offset,e[headers].n,&hdr,&sbytes,0);
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if (r==0)
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sent=b->bytesleft;
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else if (r==-1 && errno==EAGAIN)
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sent=sbytes;
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else
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sent=-1;
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} else
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sent=writev(s,v,headers);
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#else
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if (headers)
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sent=writev(s,v,headers);
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else
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sent=io_sendfile(s,e->fd,e->offset,e->n);
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#endif
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if (sent==b->bytesleft) {
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b->bytesleft=0;
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break;
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} else if (sent>0) {
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int64 rest=sent;
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b->bytesleft-=rest;
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for (i=0; e+i<last; ++i) {
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if (e[i].n-e[i].offset<=rest) {
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rest-=e[i].n-e[i].offset;
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++b->next;
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if (!rest) break;
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} else {
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e[i].offset+=rest;
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goto abort;
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}
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}
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} else break;
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}
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abort:
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return sent;
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}
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