1. 使用getcwd()获取的是当前工作路径，而不一定是程序的路径

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#define MAXBUFSIZE 1024
int main ( int argc, char * argv[] )
{
	char buf[ MAXBUFSIZE ];
	getcwd(buf, MAXBUFSIZE);
	printf("\n");
	printf(buf);
	printf("\n");
	return 0;
}

    利用 readlink()

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>

#define MAXBUFSIZE 1024

int main ( int argc, char * argv[] )
{
	char buf[ MAXBUFSIZE ];
	int count;

	count = readlink( "/proc/self/exe", buf, MAXBUFSIZE );

	if ( count < 0 || count >= MAXBUFSIZE )
	{ 
		printf( "Failed\n" );

		return( EXIT_FAILURE );
	} 
	buf[ count ] = '\0';
	printf( "/proc/self/exe -> [%s]\n", buf );

	return( EXIT_SUCCESS );
}