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http://blog.chinaunix.net/u1/53053/showart_425191.html
#include<stdlib.h>
void exit(int status);
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/* exit_test1.c */
#include<stdlib.h>
main()
{
printf("this process will exit!\n");
exit(0);
printf("never be displayed!\n");
}
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$gcc exit_test1.c -o exit_test1
$./exit_test1
this process will exit!
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#include<unistd.h>
void _exit(int status);
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