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Manual Reference Pages  - CANONICALIZE_FILE_NAME (3)

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canonicalize_file_name - return the canonicalized filename

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Synopsis
Description

#define _GNU_SOURCE
#include <stdlib.h>

char *canonicalize_file_name (const char *path);

The call canonicalize_file_name(path) is equivalent to the call realpath(path, NULL).

The function is a GNU extension.

realpath(3)