<sys/time.h>_小百科

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void FD_CLR(int fd , fd_set * fdset )

Clears the bit for the file descriptor fd in the file descriptor set fdset .

int FD_ISSET(int fd , fd_set * fdset )

Returns a non-zero value if the bit for the file descriptor fd is set in the file descriptor set by fdset , and 0 otherwise.

void FD_SET(int fd , fd_set * fdset )

Sets the bit for the file descriptor fd in the file descriptor set fdset .

void FD_ZERO(fd_set * fdset )

Initialises the file descriptor set fdset to have zero bits for all file descriptors.

FD_SETSIZE

Maximum number of file descriptors in an fd_set structure. If implemented as macros, these may evaluate their arguments more than once, so that arguments must never be expressions with side effects. The following are declared as functions and may also be defined as macros. Function prototypes must be provided for use with an ISO C compiler. int getitimer (int, struct itimerval *); int setitimer (int, const struct itimerval *, struct itimerval *); int gettimeofday (struct timeval *, void *); int select (int, fd_set *, fd_set *, fd_set *, struct timeval *); int utimes (const char *, const struct timeval [2]);

APPLICATION USAGE

None.

FUTURE DIRECTIONS

None.

APPLICATION USAGE

FUTURE DIRECTIONS

SEE ALSO