?? nbtest.c
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/* * nbtest.c: read and write in non-blocking mode * * Tested with 1.2 on the x86 * * Actually, it should run with any Unix */#include <stdio.h>#include <unistd.h>#include <fcntl.h>#include <stdlib.h>#include <errno.h>char buffer[4096];int main(int argc, char **argv){ int delay=1, n, m=0; if (argc>1) delay=atoi(argv[1]); fcntl(0, F_SETFL, fcntl(0,F_GETFL) | O_NONBLOCK); /* stdin */ fcntl(1, F_SETFL, fcntl(1,F_GETFL) | O_NONBLOCK); /* stdout */ while (1) { n=read(0, buffer, 4096); if (n>=0) m=write(1, buffer, n); if ((n<0 || m<0) && (errno != EAGAIN)) break; sleep(delay); } perror( n<0 ? "stdin" : "stdout"); exit(1);}
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