0145624108
applicable. Instead, check that the specified subdevice matches the read (or write) subdevice.
87 lines
1.6 KiB
C
87 lines
1.6 KiB
C
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#include <stdio.h>
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#include <comedilib.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <sys/ioctl.h>
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#include <errno.h>
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#include <getopt.h>
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#include <ctype.h>
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#include <math.h>
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#include <sys/time.h>
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#include <string.h>
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#include "comedi_test.h"
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#define BUFSZ 10000
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int test_read_select(void)
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{
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comedi_cmd cmd;
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char buf[BUFSZ];
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unsigned int chanlist[1];
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int go;
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int total=0;
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int ret;
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int chunks=0;
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int length=100000;
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fd_set rdset;
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struct timeval timeout;
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unsigned int flags;
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flags = comedi_get_subdevice_flags(device,subdevice);
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if(!(flags&SDF_CMD) || (comedi_get_read_subdevice(device)!=subdevice)){
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printf("not applicable\n");
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return 0;
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}
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if(comedi_get_cmd_generic_timed(device, subdevice, &cmd, 1, 1)<0){
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printf("E: comedi_get_cmd_generic_timed failed\n");
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return 0;
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}
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if(realtime)cmd.flags |= TRIG_RT;
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cmd.chanlist = chanlist;
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cmd.scan_end_arg = 1;
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cmd.stop_arg = length;
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cmd.chanlist_len = 1;
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chanlist[0] = CR_PACK(0,0,0);
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//fcntl(comedi_fileno(device),F_SETFL,O_NONBLOCK);
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comedi_command(device,&cmd);
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go=1;
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while(go){
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FD_ZERO(&rdset);
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FD_SET(comedi_fileno(device),&rdset);
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timeout.tv_sec = 0;
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timeout.tv_usec = 10000;
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ret = select(comedi_fileno(device)+1,&rdset,NULL,NULL,&timeout);
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if(ret<0){
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perror("select");
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}else if(ret==0){
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if(verbose)printf("timeout\n");
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}else{
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ret = read(comedi_fileno(device),buf,BUFSZ);
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if(verbose)printf("read==%d\n",ret);
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if(ret<0){
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if(errno==EAGAIN){
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printf("E: got EAGAIN!\n");
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}else{
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go = 0;
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perror("read");
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}
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}else if(ret==0){
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go = 0;
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}else{
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total += ret;
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chunks++;
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}
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}
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}
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return 0;
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}
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