Manual Pages  — CAP_FCNTLS_LIMIT

cap_fcntls_limit, cap_fcntls_get – manage allowed fcntl commands

LIBRARY SYNOPSIS DESCRIPTION FLAGS RETURN VALUES ERRORS SEE ALSO HISTORY AUTHORS

Standard C Library (libc, -lc)

#include <sys/capsicum.h>

int
cap_fcntls_limit(int fd, uint32_t fcntlrights);

int
cap_fcntls_get(int fd, uint32_t *fcntlrightsp);

The following flags may be specified in the fcntlrights argument or returned in the fcntlrightsp argument:

CAP_FCNTL_GETFL	Permit F_GETFL command.
CAP_FCNTL_SETFL	Permit F_SETFL command.
CAP_FCNTL_GETOWN
	Permit F_GETOWN command.
CAP_FCNTL_SETOWN
	Permit F_SETOWN command.

Upon successful completion, the value 0 is returned; otherwise the value -1 is returned and the global variable errno is set to indicate the error.

cap_fcntls_limit() succeeds unless:

[EBADF]
	The fd argument is not a valid descriptor.
[EINVAL]
	An invalid flag has been passed in fcntlrights.
[ENOTCAPABLE]
	fcntlrights would expand the list of allowed fcntl(2) commands.

cap_fcntls_get() succeeds unless:

[EBADF]
	The fd argument is not a valid descriptor.
[EFAULT]
	The fcntlrightsp argument points at an invalid address.

The cap_fcntls_get() and cap_fcntls_limit() system calls first appeared in FreeBSD 8.3 . Support for capabilities and capabilities mode was developed as part of the TrustedBSD Project.

This function was created by Pawel Jakub Dawidek <Mt pawel@dawidek.net> under sponsorship of the FreeBSD Foundation.