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CAP_FCNTLS_LIMIT(2FREEBSD) - Linux man page online | System calls

Manage allowed fcntl commands.

Chapter
March 27, 2014
CAP_FCNTLS_LIMIT(2) BSD 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

Support for capabilities and capabilities mode was developed as part of the TrustedBSD Project.

AUTHORS

This function was created by Pawel Jakub Dawidek <@dawidek.net> under sponsorship of the FreeBSD Foundation.
BSD March 27, 2014 BSD
This manual Reference Other manuals
cap_fcntls_limit(2freebsd) referred by cap_enter(2freebsd) | cap_fcntls_get(2freebsd) | cap_getmode(2freebsd) | cap_ioctls_get(2freebsd) | cap_ioctls_limit(2freebsd) | capsicum(4freebsd) | rights(4freebsd)
refer to cap_ioctls_limit(2freebsd) | cap_rights_limit(2freebsd) | fcntl(2)
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