trigger.c

linux下qmail的源码 本人加了一些注释

#include "select.h"
#include "open.h"
#include "trigger.h"
#include "hasnpbg1.h"

static int fd = -1;
#ifdef HASNAMEDPIPEBUG1
static int fdw = -1;
#endif

void trigger_set()
{
 if (fd != -1)
   close(fd);
#ifdef HASNAMEDPIPEBUG1
 if (fdw != -1)
   close(fdw);
#endif
 fd = open_read("lock/trigger");
#ifdef HASNAMEDPIPEBUG1
 fdw = open_write("lock/trigger");
#endif
}

void trigger_selprep(nfds,rfds)
int *nfds;
fd_set *rfds;
{
 if (fd != -1)
  {
   FD_SET(fd,rfds);
   if (*nfds < fd + 1) *nfds = fd + 1;
  }
}

int trigger_pulled(rfds)
fd_set *rfds;
{
 if (fd != -1) if (FD_ISSET(fd,rfds)) return 1;
 return 0;
}