1LIBCAP(3)                  Linux Programmer's Manual                 LIBCAP(3)
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NAME

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

13       #include <sys/capability.h>
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15       int cap_clear(cap_t cap_p);
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17       int cap_clear_flag(cap_t cap_p, cap_flag_t flag);
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19       int cap_compare(cap_t cap_a, cap_t cap_b);
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21       ssize_t cap_copy_ext(void *ext_p, cap_t cap_p, ssize_t size);
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23       cap_t cap_copy_int(const void *ext_p);
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25       int cap_free(void *obj_d);
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27       int cap_from_name(const char *name, cap_value_t *cap_p);
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29       cap_t cap_from_text(const char *buf_p);
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31       cap_t cap_get_fd(int fd);
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33       cap_t cap_get_file(const char *path_p);
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35       int cap_get_flag(cap_t cap_p, cap_value_t cap,
36                        cap_flag_t flag, cap_flag_value_t *value_p);
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38       #include <sys/types.h>
39       cap_t cap_get_pid(pid_t pid);
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41       cap_t cap_get_proc(void);
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43       int cap_set_fd(int fd, cap_t caps);
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45       int cap_set_file(const char *path_p, cap_t cap_p);
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48       int cap_set_flag(cap_t cap_p, cap_flag_t flag, int ncap,
49                        const cap_value_t *caps, cap_flag_value_t value);
50       int cap_set_proc(cap_t cap_p);
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52       ssize_t cap_size(cap_t cap_p);
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54       char *cap_to_name(cap_value_t cap);
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56       char *cap_to_text(cap_t caps, ssize_t *length_p);
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58       cap_t cap_get_pid(pid_t pid);
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60       cap_t cap_dup(cap_t cap_p);
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62       Link with -lcap.
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DESCRIPTION

65       These  functions work on a capability state held in working storage.  A
66       cap_t holds information about the capabilities in  each  of  the  three
67       sets,  Permitted, Inheritable, and Effective.  Each capability in a set
68       may be clear (disabled, 0) or set (enabled, 1).
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70       These functions work with the following data types:
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72       cap_value_t       identifies a capability, such as CAP_CHOWN.
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74       cap_flag_t        identifies one of the three flags associated  with  a
75                         capability  (i.e.,  it  identifies  one  of the three
76                         capability sets).  Valid values  for  this  type  are
77                         CAP_EFFECTIVE, CAP_INHERITABLE or CAP_PERMITTED.
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79       cap_flag_value_t  identifies  the  setting  of  a particular capability
80                         flag (i.e, the value  of  a  capability  in  a  set).
81                         Valid  values  for  this  type  are  CAP_CLEAR(0)  or
82                         CAP_SET(1).
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RETURN VALUE

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

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

94       Please report bugs via:
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96       https://bugzilla.kernel.org/buglist.cgi?component=lib‐
97       cap&list_id=1047723&product=Tools&resolution=---
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SEE ALSO

100       cap_clear(3),   cap_copy_ext(3),   cap_from_text(3),   cap_get_file(3),
101       cap_get_proc(3), cap_init(3), capabilities(7), getpid(2) capsh(1)
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105                                  2020-01-07                         LIBCAP(3)
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