Manpage of CANONICALIZE_FILE_NAME
CANONICALIZE_FILE_NAMESection: Linux Programmer's Manual (3)
NAMEcanonicalize_file_name - return the canonicalized absolute pathname
SYNOPSIS#define _GNU_SOURCE /* See feature_test_macros(7) */
DESCRIPTIONThe canonicalize_file_name() function returns a null-terminated string containing the canonicalized absolute pathname corresponding to path. In the returned string, symbolic links are resolved, as are .and ..pathname components. Consecutive slash (/) characters are replaced by a single slash.
The returned string is dynamically allocated by canonicalize_file_name() and the caller should deallocate it with free(3) when it is no longer required.
The call canonicalize_file_name(path)is equivalent to the call:
RETURN VALUEOn success, canonicalize_file_name() returns a null-terminated string. On error (e.g., a pathname component is unreadable or does not exist), canonicalize_file_name() returns NULL and sets errnoto indicate the error.
ATTRIBUTESFor an explanation of the terms used in this section, see attributes(7).
CONFORMING TOThis function is a GNU extension.
SEE ALSOreadlink(2), realpath(3)
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