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127 lines
3.1 KiB
C
127 lines
3.1 KiB
C
#include <unistd.h>
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#include <sys/time.h>
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#ifdef __MINGW32__
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#include <windows.h>
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#include <stdio.h>
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#else
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#include <poll.h>
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#endif
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#include <errno.h>
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#include "io_internal.h"
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#include "byte.h"
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#ifdef __MINGW32__
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/* In Windows, I/O works differently. */
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/* Instead of calling read until it says EAGAIN, you call read in
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* overlapping mode, and then wait for it to finish.
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* We map this to our API by having the first call to io_tryread always
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* return EAGAIN, wait for the I/O completion port to tell us the read
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* is finished, and then return the data we actually read the next time
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* we are called. */
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int64 io_tryread(int64 d,char* buf,int64 len) {
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io_entry* e=iarray_get(&io_fds,d);
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if (!e) { errno=EBADF; return -3; }
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if (len<0) { errno=EINVAL; return -3; }
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if (e->readqueued==2) {
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int x=e->bytes_read;
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if (e->errorcode) {
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errno=e->errorcode;
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e->canread=0;
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return -3;
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}
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if (x>len) x=len;
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if (x) {
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byte_copy(buf,x,e->inbuf);
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byte_copy(e->inbuf,e->bytes_read-x,e->inbuf+x);
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e->bytes_read-=x;
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}
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if (!e->bytes_read) {
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e->canread=0;
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if (len>x) {
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/* queue next read */
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if (len>sizeof(e->inbuf)) len=sizeof(e->inbuf);
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fprintf(stderr,"Queueing ReadFile on handle %p...",d);
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if (ReadFile((HANDLE)d,e->inbuf,len,0,&e->or)) {
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fprintf(stderr," got immediate answer\n");
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e->canread=1;
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e->readqueued=2;
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e->next_write=first_writeable;
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first_writeable=d;
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} else if ((e->errorcode=GetLastError())==ERROR_IO_PENDING) {
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fprintf(stderr," OK\n");
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e->readqueued=1;
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e->errorcode=0;
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} else {
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fprintf(stderr," error!\n");
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e->canread=1;
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e->readqueued=2;
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e->next_write=first_writeable;
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first_writeable=d;
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}
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}
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}
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return x;
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}
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if (!e->readqueued) {
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fprintf(stderr,"!e->readqueued\n");
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if (len>sizeof(e->inbuf)) len=sizeof(e->inbuf);
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if (ReadFile((HANDLE)d,e->inbuf,len,0,&e->or)) {
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e->readqueued=1;
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fprintf(stderr,"ReadFile returned nonzero\n");
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} else
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fprintf(stderr,"ReadFile returned zero\n");
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}
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errno=EAGAIN;
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return -1;
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}
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#else
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int64 io_tryread(int64 d,char* buf,int64 len) {
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long r;
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struct itimerval old,new;
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struct pollfd p;
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io_entry* e=iarray_get(&io_fds,d);
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if (!e) { errno=EBADF; return -3; }
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if (!e->nonblock) {
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p.fd=d;
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if (p.fd!=d) { errno=EBADF; return -3; } /* catch integer truncation */
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p.events=POLLIN;
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switch (poll(&p,1,0)) {
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case -1: return -3;
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case 0: errno=EAGAIN;
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e->canread=0;
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e->next_read=-1;
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return -1;
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}
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new.it_interval.tv_usec=10000;
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new.it_interval.tv_sec=0;
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new.it_value.tv_usec=10000;
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new.it_value.tv_sec=0;
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setitimer(ITIMER_REAL,&new,&old);
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}
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r=read(d,buf,len);
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if (!e->nonblock) {
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setitimer(ITIMER_REAL,&old,0);
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}
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if (r==-1) {
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if (errno==EINTR) errno=EAGAIN;
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if (errno!=EAGAIN)
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r=-3;
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}
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if (r!=len) {
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e->canread=0;
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#if defined(HAVE_SIGIO)
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if (d==alt_firstread) {
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debug_printf(("io_tryread: dequeueing %ld from alt read queue (next is %ld)\n",d,e->next_read));
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alt_firstread=e->next_read;
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e->next_read=-1;
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}
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#endif
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}
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return r;
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}
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#endif
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