?? selectpipe.c
字號:
#include <sys/types.h>#include <sys/time.h>#include "ourhdr.h"intmain(void){ int i, n, fd[2]; fd_set writeset; struct timeval tv; if (pipe(fd) < 0) err_sys("pipe error"); FD_ZERO(&writeset); for (n = 0; ; n++) { /* write 1 byte at a time until pipe is full */ FD_SET(fd[1], &writeset); tv.tv_sec = tv.tv_usec = 0; /* don't wait at all */ if ( (i = select(fd[1]+1, NULL, &writeset, NULL, &tv)) < 0) err_sys("select error"); else if (i == 0) break; if (write(fd[1], "a", 1) != 1) err_sys("write error"); } printf("pipe capacity = %d\n", n); exit(0);}
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