table of contents
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 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:
SEE ALSO¶
HISTORY¶
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.
March 27, 2014 | Debian |