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#include <sys/select.h>
The <sys/select.h> header defines the timeval structure, which includes the following members:
time_t tv_sec /* seconds */ suseconds_t tv_usec /* microseconds */
The time_t and suseconds_t types are defined as described in <sys/types.h>. See types.h(3HEAD).
The sigset_t type is defined as described in signal.h(3HEAD).
The timespec structure is defined as described in <time.h>. See time.h(3HEAD).
The <sys/select.h> header defines the fd_set type as a structure.
The following is defined as a macro: FD_SETSIZE
Maximum number of file descriptors in an fd_set structure.
Inclusion of the <sys/select.h> header can make visible all symbols from the headers <signal.h>, <sys/time.h>, and <time.h>.
See attributes(5) for descriptions of the following attributes:
| ATTRIBUTE TYPE ATTRIBUTE VALUE |
| Interface Stability Standard |
select(3C), signal.h(3HEAD), time.h(3HEAD), types.h(3HEAD), attributes(5), standards(5)