linux下c/c++程序重启自己

在程序自动升级的时候需要自己重新启动自己
示例代码：

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1. #include <unistd.h>
2. #include <stdio.h>
3. #include <stdlib.h>
4.  
5. int main(int argc, char **argv)
6. {
7.     char buf[32] = {};
8.     char *exec_argv[] = { argv[0], buf, 0 };
9.     int count = argc > 1 ? atoi(argv[1]) : 0;
10.  
11.     printf("Running: %s %d\n", argv[0], count);
12.     snprintf(buf, sizeof(buf), "%d", count+1);
13.     sleep(5);
14.  
15.     execv("/proc/self/exe", exec_argv);
16.  
17.     /* NOT REACHED */
18.     return 0;
19. }

zengming@linux-eshv:~/test> g++ main.cpp
zengming@linux-eshv:~/test> ./a.out 1
Running: ./a.out 1
Running: ./a.out 2
Running: ./a.out 3
^C
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