Bitfield expansions for ast_select. More...
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Data Structures | |
| struct | ast_fdset |
Macros | |
| #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. More... | |
Variables | |
| unsigned int | ast_FD_SETSIZE |
Detailed Description
Bitfield expansions for ast_select.
Definition in file select.h.
Macro Definition Documentation
◆ _bitsize
◆ ast_FDMAX
◆ FD_SET
◆ FD_ZERO
Function Documentation
◆ ast_select()
|
inlinestatic |
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 79 of file select.h.
80{
81#ifdef __linux__
82 return select(nfds, (fd_set *) rfds, (fd_set *) wfds, (fd_set *) efds, tvp);
83#else
84 int save_errno = 0;
85 if (tvp) {
86 struct timeval tv, tvstart, tvend, tvlen;
87 int res;
88
89 tv = *tvp;
90 gettimeofday(&tvstart, NULL);
91 res = select(nfds, (fd_set *) rfds, (fd_set *) wfds, (fd_set *) efds, tvp);
92 save_errno = errno;
93 gettimeofday(&tvend, NULL);
94 timersub(&tvend, &tvstart, &tvlen);
95 timersub(&tv, &tvlen, tvp);
96 if (tvp->tv_sec < 0 || (tvp->tv_sec == 0 && tvp->tv_usec < 0)) {
97 tvp->tv_sec = 0;
98 tvp->tv_usec = 0;
99 }
100 errno = save_errno;
101 return res;
102 }
103 else
105#endif
106}
void timersub(struct timeval *tvend, struct timeval *tvstart, struct timeval *tvdiff)
int errno
References errno, NULL, and timersub().
Referenced by ast_poll2(), and main().
