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Helper for reading data from kernel more efficiently.
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parent
c09f3c0676
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36
extra/systrace/tracy_systrace.c
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36
extra/systrace/tracy_systrace.c
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#include <fcntl.h>
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#include <poll.h>
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#include <stdio.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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#include <time.h>
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#include <unistd.h>
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enum { BufSize = 64*1024 };
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int main()
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{
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char buf[BufSize];
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int kernelFd = open( "/sys/kernel/debug/tracing/trace_pipe", O_RDONLY );
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if( kernelFd == -1 ) return -1;
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struct pollfd pfd;
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pfd.fd = kernelFd;
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pfd.events = POLLIN | POLLERR;
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struct timespec sleepTime;
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sleepTime.tv_sec = 0;
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sleepTime.tv_nsec = 1000 * 1000 * 10;
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for(;;)
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{
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while( poll( &pfd, 1, 0 ) <= 0 ) nanosleep( &sleepTime, NULL );
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const int rd = read( kernelFd, buf, BufSize );
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if( rd <= 0 ) break;
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write( STDOUT_FILENO, buf, rd );
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}
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close( kernelFd );
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return 0;
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}
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