select.h File Reference
Bitfield expansions for ast_select. More...
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Data Structures | |
| struct | ast_fdset |
Defines | |
| #define | _bitsize(a) (sizeof(a) * 8) |
| #define | ast_FDMAX 32768 |
| #define | FD_SET(fd, fds) |
| #define | FD_ZERO(a) |
Functions | |
| static int | ast_select (int nfds, ast_fdset *rfds, ast_fdset *wfds, ast_fdset *efds, struct timeval *tvp) |
| Waits for activity on a group of channels. | |
Variables | |
| unsigned int | ast_FD_SETSIZE |
Detailed Description
Bitfield expansions for ast_select.
Definition in file select.h.
Define Documentation
| #define FD_SET | ( | fd, | |
| fds | |||
| ) |
Definition at line 58 of file select.h.
Referenced by main(), and wait_result().
| #define FD_ZERO | ( | a | ) |
Definition at line 49 of file select.h.
Referenced by ast_poll2(), main(), and wait_result().
Function Documentation
| static int ast_select | ( | int | nfds, |
| ast_fdset * | rfds, | ||
| ast_fdset * | wfds, | ||
| ast_fdset * | efds, | ||
| struct timeval * | tvp | ||
| ) | [inline, static] |
Waits for activity on a group of channels.
- Parameters:
-
nfds the maximum number of file descriptors in the sets rfds file descriptors to check for read availability wfds file descriptors to check for write availability efds file descriptors to check for exceptions (OOB data) tvp timeout while waiting for events This is the same as a standard select(), except it guarantees the behaviour where the passed struct timeval is updated with how much time was not slept while waiting for the specified events
Definition at line 81 of file select.h.
References errno, and timersub().
Referenced by ast_poll2(), and main().
{
#ifdef __linux__
return select(nfds, (fd_set *) rfds, (fd_set *) wfds, (fd_set *) efds, tvp);
#else
int save_errno = 0;
if (tvp) {
struct timeval tv, tvstart, tvend, tvlen;
int res;
tv = *tvp;
gettimeofday(&tvstart, NULL);
res = select(nfds, (fd_set *) rfds, (fd_set *) wfds, (fd_set *) efds, tvp);
save_errno = errno;
gettimeofday(&tvend, NULL);
timersub(&tvend, &tvstart, &tvlen);
timersub(&tv, &tvlen, tvp);
if (tvp->tv_sec < 0 || (tvp->tv_sec == 0 && tvp->tv_usec < 0)) {
tvp->tv_sec = 0;
tvp->tv_usec = 0;
}
errno = save_errno;
return res;
}
else
return select(nfds, (fd_set *) rfds, (fd_set *) wfds, (fd_set *) efds, NULL);
#endif
}
Variable Documentation
| unsigned int ast_FD_SETSIZE |
