99 lines
1.8 KiB
C
99 lines
1.8 KiB
C
#include <setjmp.h>
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#include <stdio.h>
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#include <stdlib.h>
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static jmp_buf save;
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static void d(void)
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{
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printf("%s():Begin.\n", __FUNCTION__);
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printf("%s():Jump now.\n", __FUNCTION__);
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longjmp(save, 6);
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// longjmp(save, 0); // !!! 如果返回0，实际会返回1，避免与另一种情况冲突
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printf("%s():End.\n", __FUNCTION__);
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}
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static void c(void)
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{
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printf("%s():Begin.\n", __FUNCTION__);
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printf("%s():Call d().\n", __FUNCTION__);
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d( );
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printf("%s():d() returned.\n", __FUNCTION__);
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printf("%s():End.\n", __FUNCTION__);
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}
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static void b(void)
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{
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printf("%s():Begin.\n", __FUNCTION__);
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printf("%s():Call c().\n", __FUNCTION__);
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c( );
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printf("%s():c() returned.\n", __FUNCTION__);
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printf("%s():End.\n", __FUNCTION__);
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}
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static void a(void)
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{
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int ret;
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printf("%s():Begin.\n", __FUNCTION__);
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ret = setjmp(save);
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if (0 == ret)
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{
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printf("%s():Call b().\n", __FUNCTION__);
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b( );
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printf("%s():b() returned.\n", __FUNCTION__);
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}
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else
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{
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printf("%s():Jumped back here with code %d.\n", __FUNCTION__, ret);
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}
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printf("%s():End.\n", __FUNCTION__);
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}
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/**
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* @brief jmp
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* @details
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* d跳回a
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*
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* @param argc
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* @param argv
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* @return int
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*/
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int main(int argc, char **argv)
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{
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printf("%s():Begin.\n", __FUNCTION__);
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printf("%s():Call a().\n", __FUNCTION__);
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a( );
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printf("%s():a() returned.\n", __FUNCTION__);
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printf("%s():End.\n", __FUNCTION__);
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exit(0);
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}
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// ! out
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// main():Begin.
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// main():Call a().
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// a():Begin.
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// a():Call b().
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// b():Begin.
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// b():Call c().
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// c():Begin.
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// c():Call d().
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// d():Begin.
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// d():Jump now.
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// a():Jumped back here with code 6.
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// a():End.
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// main():a() returned.
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// main():End.
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