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Linux 2.6 - man page for canonicalize_file_name (linux section 3)

CANONICALIZE_FILE_NAME(3)				     Linux Programmer's Manual					 CANONICALIZE_FILE_NAME(3)

NAME
canonicalize_file_name - return the canonicalized absolute pathname
SYNOPSIS
#define _GNU_SOURCE /* See feature_test_macros(7) */ #include <stdlib.h> char *canonicalize_file_name(const char *path);
DESCRIPTION
The 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: realpath(path, NULL);
RETURN VALUE
On 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 errno to indicate the error.
ERRORS
See realpath(3).
ATTRIBUTES
For an explanation of the terms used in this section, see attributes(7). +-------------------------+---------------+---------+ |Interface | Attribute | Value | +-------------------------+---------------+---------+ |canonicalize_file_name() | Thread safety | MT-Safe | +-------------------------+---------------+---------+
CONFORMING TO
This function is a GNU extension.
SEE ALSO
readlink(2), realpath(3)
GNU
2017-09-15 CANONICALIZE_FILE_NAME(3)

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