eventfd.c raw

   1  #include <sys/eventfd.h>
   2  #include <unistd.h>
   3  #include <errno.h>
   4  #include "syscall.h"
   5  
   6  int eventfd(unsigned int count, int flags)
   7  {
   8  	int r = __syscall(SYS_eventfd2, count, flags);
   9  #ifdef SYS_eventfd
  10  	if (r==-ENOSYS && !flags) r = __syscall(SYS_eventfd, count);
  11  #endif
  12  	return __syscall_ret(r);
  13  }
  14  
  15  int eventfd_read(int fd, eventfd_t *value)
  16  {
  17  	return (sizeof(*value) == read(fd, value, sizeof(*value))) ? 0 : -1;
  18  }
  19  
  20  int eventfd_write(int fd, eventfd_t value)
  21  {
  22  	return (sizeof(value) == write(fd, &value, sizeof(value))) ? 0 : -1;
  23  }
  24