libcap(3) — Linux manual page


LIBCAP(3)                 Linux Programmer's Manual                LIBCAP(3)

NAME         top

       cap_clear,  cap_clear_flag,  cap_compare, cap_copy_ext, cap_copy_int,
       cap_free,  cap_from_name,  cap_from_text,  cap_get_fd,  cap_get_file,
       cap_get_flag,  cap_get_pid,  cap_get_proc,  cap_set_fd, cap_set_file,
       cap_set_flag,  cap_set_proc,  cap_size,   cap_to_name,   cap_to_text,
       cap_get_pid, cap_dup - capability data object manipulation

SYNOPSIS         top

       #include <sys/capability.h>

       int cap_clear(cap_t cap_p);

       int cap_clear_flag(cap_t cap_p, cap_flag_t flag);

       int cap_compare(cap_t cap_a, cap_t cap_b);

       ssize_t cap_copy_ext(void *ext_p, cap_t cap_p, ssize_t size);

       cap_t cap_copy_int(const void *ext_p);

       int cap_free(void *obj_d);

       int cap_from_name(const char *name, cap_value_t *cap_p);

       cap_t cap_from_text(const char *buf_p);

       cap_t cap_get_fd(int fd);

       cap_t cap_get_file(const char *path_p);

       int cap_get_flag(cap_t cap_p, cap_value_t cap,
                        cap_flag_t flag, cap_flag_value_t *value_p);

       #include <sys/types.h>
       cap_t cap_get_pid(pid_t pid);

       cap_t cap_get_proc(void);

       int cap_set_fd(int fd, cap_t caps);

       int cap_set_file(const char *path_p, cap_t cap_p);

       int cap_set_flag(cap_t cap_p, cap_flag_t flag, int ncap,
                        const cap_value_t *caps, cap_flag_value_t value);
       int cap_set_proc(cap_t cap_p);

       ssize_t cap_size(cap_t cap_p);

       char *cap_to_name(cap_value_t cap);

       char *cap_to_text(cap_t caps, ssize_t *length_p);

       cap_t cap_get_pid(pid_t pid);

       cap_t cap_dup(cap_t cap_p);

       Link with -lcap.

DESCRIPTION         top

       These functions work on a capability state held in working storage.
       A cap_t holds information about the capabilities in each of the three
       sets, Permitted, Inheritable, and Effective.  Each capability in a
       set may be clear (disabled, 0) or set (enabled, 1).

       These functions work with the following data types:

       cap_value_t       identifies a capability, such as CAP_CHOWN.

       cap_flag_t        identifies one of the three flags associated with a
                         capability (i.e., it identifies one of the three
                         capability sets).  Valid values for this type are

       cap_flag_value_t  identifies the setting of a particular capability
                         flag (i.e, the value of a capability in a set).
                         Valid values for this type are CAP_CLEAR(0) or

RETURN VALUE         top

       The return value is generally specific to the individual function
       called.  On failure, errno is set appropriately.

CONFORMING TO         top

       These functions are as per the withdrawn POSIX.1e draft
       specification.  The following functions are Linux extensions:
       cap_clear_flag(), cap_from_name(), cap_to_name(), and cap_compare().

REPORTING BUGS         top

       Please report bugs via:

SEE ALSO         top

       cap_clear(3), cap_copy_ext(3), cap_from_text(3), cap_get_file(3),
       cap_get_proc(3), cap_init(3), capabilities(7), getpid(2) capsh(1)

COLOPHON         top

       This page is part of the libcap (capabilities commands and library)
       project.  Information about the project can be found at 
       ⟨⟩.  If you have
       a bug report for this manual page, send it to
       (please put "libcap" in the Subject line).  This page was obtained
       from the project's upstream Git repository
       ⟨⟩ on
       2020-11-01.  (At that time, the date of the most recent commit that
       was found in the repository was 2020-10-28.)  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

                                 2020-01-07                        LIBCAP(3)

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