de2-115-fpga-pong/software/hello_world_bsp/HAL/src/alt_fork.c

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#include "sys/alt_warning.h"
#include "sys/alt_errno.h"
#include "os/alt_syscall.h"

/*
 * The fork() system call is used by newlib to create a duplicate copy of the
 * curent process.  This is unsupported in the HAL environment. However a 
 * "do-nothing" implementation is still provied for newlib compatability.
 *
 * ALT_FORK is mapped onto the fork() system call in alt_syscall.h
 */
 
int ALT_FORK (void)
{
  /* Generate a link time warning, should this function ever be called. */

  ALT_STUB_WARNING(fork);

 /* Indicate an error */

  ALT_ERRNO = ENOSYS;
  return -1;
}