CAP_FCNTLS_LIMIT(2) FreeBSD System Calls Manual CAP_FCNTLS_LIMIT(2)
NAME
cap_fcntls_limit, cap_fcntls_get - manage allowed fcntl commands
LIBRARY
Standard C Library (libc, -lc)
SYNOPSIS
#include <sys/capsicum.h>
int
cap_fcntls_limit(int fd, uint32_t fcntlrights);
int
cap_fcntls_get(int fd, uint32_t *fcntlrightsp);
DESCRIPTION
If a file descriptor is granted the CAP_FCNTL capability right, the list
of allowed fcntl(2) commands can be selectively reduced (but never
expanded) with the cap_fcntls_limit() system call.
A bitmask of allowed fcntls commands for a given file descriptor can be
obtained with the cap_fcntls_get() system call.
FLAGS
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.
RETURN VALUES
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.
ERRORS
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.
[ENOSYS] The running kernel was compiled without options
CAPABILITY_MODE.
SEE ALSO
cap_ioctls_limit(2), cap_rights_limit(2), fcntl(2)
HISTORY
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.
AUTHORS
This function was created by Pawel Jakub Dawidek <
[email protected]>
under sponsorship of the FreeBSD Foundation.
FreeBSD 14.1-RELEASE-p8 March 9, 2023 FreeBSD 14.1-RELEASE-p8