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/*
* libmainloop/select.c
*
* Partly based on a contributed code.
*
* See the included file LICENSE for details.
*/
#include <signal.h>
#include <sys/select.h>
#include <errno.h>
#include <string.h>
#include <libtu/types.h>
#include <libtu/misc.h>
#include <libtu/dlist.h>
#include "select.h"
#include "signal.h"
/*{{{ File descriptor management */
static WInputFd *input_fds=NULL;
static WInputFd *find_input_fd(int fd)
{
WInputFd *tmp=input_fds;
while(tmp){
if(tmp->fd==fd)
break;
tmp=tmp->next;
}
return tmp;
}
bool mainloop_register_input_fd(int fd, void *data,
void (*callback)(int fd, void *d))
{
WInputFd *tmp;
if(find_input_fd(fd)!=NULL)
return FALSE;
tmp=ALLOC(WInputFd);
if(tmp==NULL)
return FALSE;
tmp->fd=fd;
tmp->data=data;
tmp->process_input_fn=callback;
LINK_ITEM(input_fds, tmp, next, prev);
return TRUE;
}
void mainloop_unregister_input_fd(int fd)
{
WInputFd *tmp=find_input_fd(fd);
if(tmp!=NULL){
UNLINK_ITEM(input_fds, tmp, next, prev);
free(tmp);
}
}
static void set_input_fds(fd_set *rfds, int *nfds)
{
WInputFd *tmp=input_fds;
while(tmp){
FD_SET(tmp->fd, rfds);
if(tmp->fd>*nfds)
*nfds=tmp->fd;
tmp=tmp->next;
}
}
static void check_input_fds(fd_set *rfds)
{
WInputFd *tmp=input_fds, *next=NULL;
while(tmp){
next=tmp->next;
if(FD_ISSET(tmp->fd, rfds))
tmp->process_input_fn(tmp->fd, tmp->data);
tmp=next;
}
}
/*}}}*/
/*{{{ Select */
void mainloop_select()
{
fd_set rfds;
int nfds=0;
int ret=0;
#if _POSIX_SELECT || _POSIX_C_SOURCE >= 200112L || _XOPEN_SOURCE >= 600
{
sigset_t oldmask;
FD_ZERO(&rfds);
set_input_fds(&rfds, &nfds);
mainloop_block_signals(&oldmask);
if(!mainloop_unhandled_signals())
ret=pselect(nfds+1, &rfds, NULL, NULL, NULL, &oldmask);
sigprocmask(SIG_SETMASK, &oldmask, NULL);
}
#else
#warning "pselect() unavailable -- using dirty hacks"
{
struct timeval tv={0, 0};
bool to;
/* If there are timers, make sure we return from select with
* some delay, if the timer signal happens right before
* entering select(). Race conditions with other signals
* we'll just have to ignore without pselect().
*/
do{
bool to;
FD_ZERO(&rfds);
set_input_fds(&rfds, &nfds);
to=libmainloop_get_timeout(&tv);
if(mainloop_unhandled_signals()){
ret=0;
break;
}
ret=select(nfds+1, &rfds, NULL, NULL, to ? &tv : NULL);
}while(ret<0 && errno==EINTR && !mainloop_unhandled_signals());
}
#endif
if(ret>0)
check_input_fds(&rfds);
}
/*}}}*/
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