/usr/include/sys/capability.h is in libcap-dev 1:2.22-1ubuntu3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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* <sys/capability.h>
*
* Copyright (C) 1997 Aleph One
* Copyright (C) 1997-8,2008 Andrew G. Morgan <morgan@kernel.org>
*
* defunct POSIX.1e Standard: 25.2 Capabilities <sys/capability.h>
*/
#ifndef _SYS_CAPABILITY_H
#define _SYS_CAPABILITY_H
#ifdef __cplusplus
extern "C" {
#endif
/*
* This file complements the kernel file by providing prototype
* information for the user library.
*/
#include <sys/types.h>
#include <stdint.h>
#include <linux/types.h>
/*
* Required to limit what gets defined in the kernel header file.
*/
#ifndef __user
#define __user
#endif
#include <linux/capability.h>
/*
* POSIX capability types
*/
/*
* Opaque capability handle (defined internally by libcap)
* internal capability representation
*/
typedef struct _cap_struct *cap_t;
/* "external" capability representation is a (void *) */
/*
* This is the type used to identify capabilities
*/
typedef int cap_value_t;
/*
* Set identifiers
*/
typedef enum {
CAP_EFFECTIVE=0, /* Specifies the effective flag */
CAP_PERMITTED=1, /* Specifies the permitted flag */
CAP_INHERITABLE=2 /* Specifies the inheritable flag */
} cap_flag_t;
/*
* These are the states available to each capability
*/
typedef enum {
CAP_CLEAR=0, /* The flag is cleared/disabled */
CAP_SET=1 /* The flag is set/enabled */
} cap_flag_value_t;
/*
* User-space capability manipulation routines
*/
/* libcap/cap_alloc.c */
extern cap_t cap_dup(cap_t);
extern int cap_free(void *);
extern cap_t cap_init(void);
/* libcap/cap_flag.c */
extern int cap_get_flag(cap_t, cap_value_t, cap_flag_t, cap_flag_value_t *);
extern int cap_set_flag(cap_t, cap_flag_t, int, const cap_value_t *,
cap_flag_value_t);
extern int cap_clear(cap_t);
extern int cap_clear_flag(cap_t, cap_flag_t);
/* libcap/cap_file.c */
extern cap_t cap_get_fd(int);
extern cap_t cap_get_file(const char *);
extern int cap_set_fd(int, cap_t);
extern int cap_set_file(const char *, cap_t);
/* libcap/cap_proc.c */
extern cap_t cap_get_proc(void);
extern cap_t cap_get_pid(pid_t);
extern int cap_set_proc(cap_t);
extern int cap_get_bound(cap_value_t);
extern int cap_drop_bound(cap_value_t);
#define CAP_IS_SUPPORTED(cap) (cap_get_bound(cap) >= 0)
/* libcap/cap_extint.c */
extern ssize_t cap_size(cap_t);
extern ssize_t cap_copy_ext(void *, cap_t, ssize_t);
extern cap_t cap_copy_int(const void *);
/* libcap/cap_text.c */
extern cap_t cap_from_text(const char *);
extern char * cap_to_text(cap_t, ssize_t *);
extern int cap_from_name(const char *, cap_value_t *);
extern char * cap_to_name(cap_value_t);
#define CAP_DIFFERS(result, flag) (((result) & (1 << (flag))) != 0)
extern int cap_compare(cap_t, cap_t);
/* system calls - look to libc for function to system call mapping */
extern int capset(cap_user_header_t header, cap_user_data_t data);
extern int capget(cap_user_header_t header, const cap_user_data_t data);
/* deprecated - use cap_get_pid() */
extern int capgetp(pid_t pid, cap_t cap_d);
/* not valid with filesystem capability support - use cap_set_proc() */
extern int capsetp(pid_t pid, cap_t cap_d);
#ifdef __cplusplus
}
#endif
#endif /* _SYS_CAPABILITY_H */
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