mirror of
https://github.com/ioacademy-jikim/device_driver
synced 2025-06-07 07:56:08 +00:00
60 lines
903 B
C
60 lines
903 B
C
#if 1
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#include <stdio.h>
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#include <poll.h>
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#include <fcntl.h>
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int main()
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{
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int fd, ret;
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int temp;
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char buff[1024];
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struct pollfd fds[2];
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fd = open( "/dev/mydev", O_RDONLY );
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fds[0].fd = 0 ;
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fds[0].events = POLLIN;
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fds[1].fd = fd ;
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fds[1].events = POLLIN;
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poll( fds, 2, -1 );
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if( fds[0].revents & POLLIN )
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{
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read( 0, buff, sizeof buff );
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buff[ret-1] = 0;
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printf("buff=%s\n", buff );
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}
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if( fds[1].revents & POLLIN )
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{
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read( fd, &temp, sizeof temp );
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printf("temp=%d\n", temp );
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}
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close(fd);
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return 0;
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}
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#endif
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#if 0
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#include <fcntl.h>
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#include <stdio.h>
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#include <string.h>
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#include <sys/ioctl.h>
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#include <errno.h>
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#define LED_RATIO _IO( 'm', 1 )
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int main()
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{
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int fd, ret;
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char buff[10];
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fd = open( "/dev/mydev", O_RDONLY );
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ret = ioctl(fd, LED_RATIO);
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if( ret < 0 )
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{
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printf("ret=%d, errno=%d\n", ret, errno );
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return 0;
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}
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close(fd);
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return 0;
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}
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#endif
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