NAME¶

LIBRARY¶

SYNOPSIS¶

int
cap_rights_limit(int fd, const cap_rights_t *rights);

DESCRIPTION¶

The rights argument should be prepared using cap_rights_init(3) family of functions.

Capability rights assigned to a file descriptor can be obtained with the cap_rights_get(3) function.

The complete list of the capability rights can be found in the rights(4) manual page.

RETURN VALUES¶

EXAMPLES¶

cap_rights_t setrights;
char buf[1];
int fd;

fd = open("/tmp/foo", O_RDWR);
if (fd < 0)
	err(1, "open() failed");

if (cap_enter() < 0)
	err(1, "cap_enter() failed");

cap_rights_init(&setrights, CAP_READ);
if (cap_rights_limit(fd, &setrights) < 0)
	err(1, "cap_rights_limit() failed");

buf[0] = 'X';

if (write(fd, buf, sizeof(buf)) > 0)
	errx(1, "write() succeeded!");

if (read(fd, buf, sizeof(buf)) < 0)
	err(1, "read() failed");

ERRORS¶

[EBADF]

The fd argument is not a valid active descriptor.

[EINVAL]

An invalid right has been requested in rights.

[ENOTCAPABLE]

The rights argument contains capability rights not present for the given file descriptor. Capability rights list can only be reduced, never expanded.

SEE ALSO¶

HISTORY¶

AUTHORS¶