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CAP_FCNTLS_LIMIT(2)	       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 ob-
     tained with the cap_fcntls_get() system call.

FLAGS
     The following flags may be specified in the  fcntlrights  argument  or  re-
     turned 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 CAPABIL-
			ITY_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 <pawel@dawidek.net>  under
     sponsorship of the FreeBSD Foundation.

FreeBSD ports 15.quarterly	  March 9, 2023 	     CAP_FCNTLS_LIMIT(2)

Want to link to this manual page? Use this URL:
<https://man.freebsd.org/cgi/man.cgi?query=cap_fcntls_get&sektion=2&manpath=FreeBSD+15.1-RELEASE+and+Ports.quarterly>

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