1CANONICALIZE_FILE_NAME(3)  Linux Programmer's Manual CANONICALIZE_FILE_NAME(3)
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NAME

6       canonicalize_file_name - return the canonicalized absolute pathname
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SYNOPSIS

9       #define _GNU_SOURCE         /* See feature_test_macros(7) */
10       #include <stdlib.h>
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12       char *canonicalize_file_name(const char *path);
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DESCRIPTION

15       The  canonicalize_file_name() function returns a null-terminated string
16       containing the canonicalized absolute pathname corresponding  to  path.
17       In  the  returned string, symbolic links are resolved, as are .  and ..
18       pathname components.  Consecutive slash (/) characters are replaced  by
19       a single slash.
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21       The   returned   string   is   dynamically   allocated   by  canonical‐
22       ize_file_name() and the caller should deallocate it with  free(3)  when
23       it is no longer required.
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25       The call canonicalize_file_name(path) is equivalent to the call:
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27           realpath(path, NULL);
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RETURN VALUE

30       On  success, canonicalize_file_name() returns a null-terminated string.
31       On error (e.g., a pathname component is unreadable or does not  exist),
32       canonicalize_file_name()  returns  NULL  and sets errno to indicate the
33       error.
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ERRORS

36       See realpath(3).
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ATTRIBUTES

39       For  an  explanation  of  the  terms  used   in   this   section,   see
40       attributes(7).
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42       ┌─────────────────────────┬───────────────┬─────────┐
43       │Interface                │ Attribute     │ Value   │
44       ├─────────────────────────┼───────────────┼─────────┤
45       │canonicalize_file_name() │ Thread safety │ MT-Safe │
46       └─────────────────────────┴───────────────┴─────────┘

CONFORMING TO

48       This function is a GNU extension.
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SEE ALSO

51       readlink(2), realpath(3)
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COLOPHON

54       This  page  is  part of release 4.16 of the Linux man-pages project.  A
55       description of the project, information about reporting bugs,  and  the
56       latest     version     of     this    page,    can    be    found    at
57       https://www.kernel.org/doc/man-pages/.
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61GNU                               2017-09-15         CANONICALIZE_FILE_NAME(3)
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