?? writable_timeo.c
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/* include writable_timeo */#include "unp.h"intwritable_timeo(int fd, int sec){ fd_set wset; struct timeval tv; FD_ZERO(&wset); FD_SET(fd, &wset); tv.tv_sec = sec; tv.tv_usec = 0; return(select(fd+1, NULL, &wset, NULL, &tv)); /* > 0 if descriptor is writable */}/* end writable_timeo */intWritable_timeo(int fd, int sec){ int n; if ( (n = writable_timeo(fd, sec)) < 0) err_sys("writable_timeo error"); return(n);}?? 快捷鍵說明
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