poll.c File Reference

#include "asterisk.h"
#include <unistd.h>
#include <sys/types.h>
#include <sys/time.h>
#include <assert.h>
#include <string.h>
#include <errno.h>
#include "asterisk/utils.h"
#include "asterisk/poll-compat.h"

Include dependency graph for poll.c:

Go to the source code of this file.

Functions
int	ast_poll2 (struct pollfd *pArray, unsigned long n_fds, struct timeval *tv)
	Same as poll(2), except the time is specified in microseconds and the tv argument is modified to indicate the time remaining. More...

Variables
unsigned int	ast_FD_SETSIZE = FD_SETSIZE

Function Documentation

ast_poll2()

int ast_poll2	(	struct pollfd *	pArray,
		unsigned long	n_fds,
		struct timeval *	tv
	)

Same as poll(2), except the time is specified in microseconds and the tv argument is modified to indicate the time remaining.

Definition at line 268 of file poll.c.

{
#if !defined(AST_POLL_COMPAT)
    struct timeval start = ast_tvnow();
#if defined(HAVE_PPOLL)
    struct timespec ts = { tv ? tv->tv_sec : 0, tv ? tv->tv_usec * 1000 : 0 };
    int res = ppoll(pArray, n_fds, tv ? &ts : NULL, NULL);
#else
    int res = poll(pArray, n_fds, tv ? tv->tv_sec * 1000 + tv->tv_usec / 1000 : -1);
#endif
    struct timeval after = ast_tvnow();
    if (res > 0 && tv && ast_tvdiff_ms(ast_tvadd(*tv, start), after) > 0) {
        *tv = ast_tvsub(*tv, ast_tvsub(after, start));
    } else if (res > 0 && tv) {
        *tv = ast_tv(0, 0);
    }
    return res;
#else
    ast_fdset read_descs, write_descs, except_descs;
    int ready_descriptors, max_fd = 0;
 
    FD_ZERO(&read_descs);
    FD_ZERO(&write_descs);
    FD_ZERO(&except_descs);
 
    if (pArray) {
        max_fd = map_poll_spec(pArray, n_fds, &read_descs, &write_descs, &except_descs);
    }
 
    ready_descriptors = ast_select(max_fd + 1, &read_descs, &write_descs, &except_descs, tv);
 
    if (ready_descriptors >= 0) {
        map_select_results(pArray, n_fds, &read_descs, &write_descs, &except_descs);
    }
 
    return ready_descriptors;
#endif
}

References ast_select(), ast_tv(), ast_tvadd(), ast_tvdiff_ms(), ast_tvnow(), ast_tvsub(), FD_ZERO, and NULL.

Referenced by AST_TEST_DEFINE().

Variable Documentation

ast_FD_SETSIZE

unsigned int ast_FD_SETSIZE = FD_SETSIZE

Definition at line 86 of file poll.c.

Referenced by main().