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HTML rendering created 2025-09-06 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
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NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | CONFORMING TO | SEE ALSO | COLOPHON |
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CAP_INIT(3) Linux Programmer's Manual CAP_INIT(3)
cap_init, cap_free, cap_dup - capability data object storage
management
#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These functions are specified in the withdrawn POSIX.1e draft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/pub/scm/libs/libcap/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
⟨https://git.kernel.org/pub/scm/libs/libcap/libcap.git/⟩ on
2025-08-11. (At that time, the date of the most recent commit
that was found in the repository was 2025-08-10.) If you discover
any rendering problems in this HTML version 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 manual page), send a
mail to man-pages@man7.org
2021-03-06 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), cap_iab(3), cap_launch(3), libcap(3), capabilities(7)
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HTML rendering created 2025-09-06 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
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