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.

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 <pawel@dawidek.net>
     under sponsorship of the FreeBSD Foundation.

FreeBSD 13.1-RELEASE-p6           May 5, 2020          FreeBSD 13.1-RELEASE-p6