github.com/afumu/libc@v0.0.6/musl/src/linux/eventfd.c (about)

     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  }