How Can I Get the Full Path of My C/C Executable?

How to Determine the Executable Location in C

In C/C , obtaining the complete path of the currently executing program can be challenging. Specifically, using argv[0] may not provide the full path.

Unix Systems without /proc

If your Unix system lacks the /proc file system, consider the following strategies:

• Check if argv[0] begins with a slash (/): This indicates an absolute path.
• If argv[0] contains slashes (/): Append it to the current working directory (cwd).
• Otherwise, search for the executable argv[0] in directories specified in the $PATH environment variable.

Unix Systems with /proc

For Unix systems with /proc, you can use one of the following methods:

• Linux: readlink("/proc/self/exe", buf, bufsize)
• FreeBSD: readlink("/proc/curproc/file", buf, bufsize)
• Solaris: readlink("/proc/self/path/a.out", buf, bufsize)

Windows Systems

On Windows, use the GetModuleFileName function:

GetModuleFileName(NULL, buf, bufsize);

Additional Considerations

• Verify that the executable is not a symlink and resolve it if necessary.
• The calling process should set argv[0] correctly for this information to be accurate.

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