util.cpp

来自「EM8511s中使用的avi播放器」· C++ 代码 · 共 48 行

#include <sys/time.h>
#include <sys/ipc.h>
#include <sys/msg.h>
#include <sys/wait.h>
#include "util.h"

int loadmodule (char *module)
{
	pid_t pid;
	char *my_argv[4] = {INSMOD_PROG, module, NULL};
	char *my_envp[1] = {NULL};
	int status;

	if ((pid = vfork()) == 0) 
	{                       
		//this is the child do the execve
		execve (INSMOD_PATH""INSMOD_PROG, my_argv, my_envp);
		_exit (1);
	} 
	else 
	{
		// this is the parent.
		pid = waitpid (pid, &status, 0);
		if (WIFEXITED (status) && (WEXITSTATUS (status) != 0))
		{
			return 1;
		} 
		else if (WIFEXITED (status) && (WEXITSTATUS (status) == 0))
		{
			return 0;
		} 
		else 
		{
			printf ("Seems that an error happened during module loading\n");
			return 1;
		}
	}
	return 0;
}

int gettime_ms (void)
{
	struct timeval tv1;
	struct timezone tz;
	gettimeofday (&tv1, &tz);
	return tv1.tv_sec * 1000 + tv1.tv_usec/1000;
}