How do I get the directory that a program is running from?

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Here’s code to get the full path to the executing app:

Windows:

char pBuf[256];
size_t len = sizeof(pBuf); 
int bytes = GetModuleFileName(NULL, pBuf, len);
return bytes ? bytes : -1;

Linux:

int bytes = MIN(readlink("/proc/self/exe", pBuf, len), len - 1);
if(bytes >= 0)
    pBuf[bytes] = '\0';
return bytes;

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