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NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | CONFORMING TO | SEE ALSO | COLOPHON |
CAP_INIT(3) Linux Programmer's Manual CAP_INIT(3)
cap_init, cap_free, cap_dup - capability data object storage manage‐
ment
#include <sys/capability.h>
cap_t cap_init(void);
int cap_free(void *obj_d);
cap_t cap_dup(cap_t cap_p);
Link with -lcap.
The capabilities associated with a file or process are never edited
directly. Instead, working storage is allocated to contain a
representation of the capability state. Capabilities are edited and
manipulated only within this working storage area. Once editing of
the capability state is complete, the updated capability state is
used to replace the capability state associated with the file or
process.
cap_init() creates a capability state in working storage and returns
a pointer to the capability state. The initial value of all flags
are cleared. The caller should free any releasable memory, when the
capability state in working storage is no longer required, by calling
cap_free() with the cap_t as an argument.
cap_free() liberates any releasable memory that has been allocated to
the capability state identified by obj_d. The obj_d argument may
identify either a cap_t entity, or a char * entity allocated by the
cap_to_text() function.
cap_dup() returns a duplicate capability state in working storage
given by the source object cap_p, allocating any memory necessary,
and returning a pointer to the newly created capability state. Once
duplicated, no operation on either capability state affects the other
in any way. When the duplicated capability state in working storage
is no longer required, the caller should free any releasable memory
by calling cap_free() with the cap_t as an argument.
cap_init() and cap_dup() return a non-NULL value on success, and NULL
on failure.
cap_free() returns zero on success, and -1 on failure.
On failure, errno is set to EINVAL or ENOMEM.
These functions are specified in the withdrawn POSIX.1e draft
specification.
libcap(3), cap_clear(3), cap_copy_ext(3), cap_from_text(3),
cap_get_file(3), cap_get_proc(3), capabilities(7)
This page is part of the libcap (capabilities commands and library)
project. Information about the project can be found at
⟨https://git.kernel.org/cgit/linux/kernel/git/morgan/libcap.git/⟩. If
you have a bug report for this manual page, send it to
morgan@kernel.org (please put "libcap" in the Subject line). This
page was obtained from the project's upstream Git repository
⟨git://git.kernel.org/pub/scm/linux/kernel/git/morgan/libcap.git⟩ on
2017-07-05. If you discover any rendering problems in this HTML ver‐
sion of the page, or you believe there is a better or more up-to-date
source for the page, or you have corrections or improvements to the
information in this COLOPHON (which is not part of the original man‐
ual page), send a mail to man-pages@man7.org
2008-05-11 CAP_INIT(3)
Pages that refer to this page: cap_clear(3), cap_copy_ext(3), cap_from_text(3), cap_get_file(3), cap_get_proc(3), libcap(3), capabilities(7)