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    <p>If you are using gcc you can use the inbuilt function __builtin_return_address. void * __builtin_return_address (unsigned int level)</p> <p>The function returns the address of the function from which the function is called. i.e the caller of the function.</p> <p>The level specifies how many levels. 0 means current function 1 means caller, 2 means callers caller. The following example will provide the usage. By printing the addresses of the function, the call stack can be determined.</p> <pre><code>int calla() { printf("Inside calla\n"); printf("A1=%x\n",__builtin_return_address (0)); printf("A2=%x\n",__builtin_return_address (1) ); printf("A3=%x\n",__builtin_return_address (2) ); } int callb() { printf("Inside callb\n"); calle(); printf("B1=%x\n",__builtin_return_address (0) ); printf("B2=%x\n",__builtin_return_address (1) ); printf("B3=%x\n",__builtin_return_address (2) ); } int callc() { printf("Inside callc\n"); printf("C1=%x\n",__builtin_return_address (0) ); printf("C2=%x\n",__builtin_return_address (1) ); printf("C3=%x\n",__builtin_return_address (2) ); } int calld() { printf("Inside calld\n"); printf("D1=%x\n",__builtin_return_address (0) ); printf("D2=%x\n",__builtin_return_address (1) ); printf("D3=%x\n",__builtin_return_address (2) ); } int calle() { printf("Inside calle\n"); printf("E1=%x\n",__builtin_return_address (0) ); printf("E2=%x\n",__builtin_return_address (1) ); printf("E3=%x\n",__builtin_return_address (2) ); } main() { printf("Address of main=%x calla=%x callb=%x callc=%x calld=%x calle=%x\n",main,calla,callb,callc,calld,calle); calla(); callb(); calld(); } </code></pre>
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    1. POGet call stack from any thread within C
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    1. COBut how does that allow one thread to get the call stack from another thread?
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