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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#include <unistd.h>
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#include <stdio.h>
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#include <stdlib.h>
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int main(int argc, char **argv)
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{
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char buf[32] = {};
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char *exec_argv[] = { argv[0], buf, 0 };
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int count = argc > 1 ? atoi(argv[1]) : 0;
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printf("Running: %s %d\n", argv[0], count);
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snprintf(buf, sizeof(buf), "%d", count+1);
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sleep(5);
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execv("/proc/self/exe", exec_argv);
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/* NOT REACHED */
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return 0;
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}
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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