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28 lines
782 B
28 lines
782 B
6 years ago
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/* sbrk and brk example */
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#include <stdio.h>
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#include <unistd.h>
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#include <sys/types.h>
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int main(int argc, char ** argv)
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{
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int *curr_brk, *tmp_brk = NULL;
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int num,i;
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if(argc >1) { num=atoi(argv[1]);}
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printf("Welcome to sbrk example:%d num %d\n", getpid(),num);
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for(i=0;i<num;i++) {
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/* sbrk(0) gives current program break location */
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tmp_brk = curr_brk = sbrk(0);
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printf("%d: Program Break Location1:%p\n", i, curr_brk);
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/* brk(addr) increments/decrements program break location */
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brk((char*)curr_brk + 4096);
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curr_brk = sbrk(0);
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printf("%d: Program break Location2:%p\n", i, curr_brk);
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*(curr_brk-20)=1;
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// brk(tmp_brk);
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// curr_brk = sbrk(0);
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// printf("Program Break Location3:%p\n", curr_brk);
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}
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return 0;
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}
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