GETPATHBYLABEL(3TSOL) Trusted Extensions Library Functions


NAME


getpathbylabel - return the zone pathname

SYNOPSIS


cc [flags...] file... -ltsol [library...]


#include <tsol/label.h>

char *getpathbylabel(const char *path, char *resolved_path,
size_t bufsize, const m_label_t *sl);


DESCRIPTION


The getpathbylabel() function expands all symbolic links and resolves
references to '/./', '/../', extra '/' characters, and stores the zone
pathname in the buffer named by resolved_path. The bufsize argument
specifies the size in bytes of this buffer. The resulting path will have
no symbolic links components, nor any '/./', '/../'. This function can
only be called from the global zone.


The zone pathname is relative to the sensitivity label sl. To specify a
sensitivity label for a zone name which does not exist, the process must
assert either the PRIV_FILE_UPGRADE_SL or PRIV_FILE_DOWNGRADE_SL
privilege depending on whether the specified sensitivity label dominates
or does not dominate the process sensitivity label.

RETURN VALUES


The getpathbylabel() function returns a pointer to the resolved_path on
success. Otherwise it returns NULL and sets errno to indicate the error.

ERRORS


The getpathbylabel() function will fail if:

EACCES
Search permission is denied for a component of the path
prefix of path.


EFAULT
resolved_path extends outside the process's allocated
address space or beyond bufsize bytes.


EINVAL
path or resolved_path was NULL, current zone is not the
global zone, or sl is invalid.


EIO
An I/O error occurred while reading from or writing to
the file system.


ELOOP
Too many symbolic links were encountered in translating
path.


ENAMETOOLONG
The length of the path argument exceeds PATH_MAX, or a
pathname component is longer than NAME_MAX (see
sysconf(3C)) while _POSIX_NO_TRUNC is in effect (see
pathconf(2)).


ENOENT
The named file does not exist.


ATTRIBUTES


See attributes(5) for descriptions of the following attributes:


+--------------------+-----------------+
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+--------------------+-----------------+
|Interface Stability | Committed |
+--------------------+-----------------+
|MT-Level | MT-Safe |
+--------------------+-----------------+

SEE ALSO


readlink(2), getzonerootbyid(3TSOL), libtsol(3LIB), attributes(5),
labels(5)

WARNINGS


The getpathbylabel() function indirectly invokes the readlink(2) system
call, and hence inherits the possibility of hanging due to inaccessible
file system resources.

NOTES


The functionality described on this manual page is available only if the
system is configured with Trusted Extensions.


July 20, 2007 GETPATHBYLABEL(3TSOL)