CentOS 7.0 - man page for canonicalize_file_name (centos section 3)
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CANONICALIZE_FILE_NAME(3) Linux Programmer's Manual CANONICALIZE_FILE_NAME(3)
canonicalize_file_name - return the canonicalized absolute pathname
#define _GNU_SOURCE /* See feature_test_macros(7) */
char *canonicalize_file_name(const char *path);
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 (/) charac-
ters 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:
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.
This function is a GNU extension.
This page is part of release 3.53 of the Linux man-pages project. A description of the
project, and information about reporting bugs, can be found at
GNU 2013-05-11 CANONICALIZE_FILE_NAME(3)
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