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(7) for descriptions of the following attributes:


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

SEE ALSO

readlink(2), libtsol(3LIB), getzonerootbyid(3TSOL), attributes(7),
labels(7)

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)