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FreeBSD 11.0 - man page for cap_rights_get (freebsd section 3)

CAP_RIGHTS_GET(3)					   BSD Library Functions Manual 					 CAP_RIGHTS_GET(3)

NAME
cap_rights_get -- obtain capability rights
LIBRARY
Standard C Library (libc, -lc)
SYNOPSIS
#include <sys/capsicum.h> int cap_rights_get(int fd, cap_rights_t *rights);
DESCRIPTION
The cap_rights_get function allows to obtain current capability rights for the given descriptor. The function will fill the rights argument with all capability rights if they were not limited or capability rights configured during the last successful call of cap_rights_limit(2) on the given descriptor. The rights argument can be inspected using cap_rights_init(3) family of functions. The complete list of the capability rights can be found in the rights(4) manual page.
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.
EXAMPLES
The following example demonstrates how to limit file descriptor capability rights and how to obtain them. cap_rights_t setrights, getrights; int fd; memset(&setrights, 0, sizeof(setrights)); memset(&getrights, 0, sizeof(getrights)); fd = open("/tmp/foo", O_RDONLY); if (fd < 0) err(1, "open() failed"); cap_rights_init(&setrights, CAP_FSTAT, CAP_READ); if (cap_rights_limit(fd, &setrights) < 0 && errno != ENOSYS) err(1, "cap_rights_limit() failed"); if (cap_rights_get(fd, &getrights) < 0 && errno != ENOSYS) err(1, "cap_rights_get() failed"); assert(memcmp(&setrights, &getrights, sizeof(setrights)) == 0);
ERRORS
cap_rights_get() succeeds unless: [EBADF] The fd argument is not a valid active descriptor. [EFAULT] The rights argument points at an invalid address.
SEE ALSO
cap_rights_limit(2), errno(2), open(2), assert(3), cap_rights_init(3), err(3), memcmp(3), memset(3), capsicum(4), rights(4)
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.
BSD
March 27, 2014 BSD

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