FreeBSD manual

download PDF document: cap_fcntls_limit.2.pdf

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. 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 14.0-RELEASE-p6 March 9, 2023 FreeBSD 14.0-RELEASE-p6