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           #include <sys/capability.h>
           cap_t cap_get_proc(void);
           int cap_set_proc(cap_t cap_p);
           int cap_get_bound(cap_value_t cap);
           CAP_IS_SUPPORTED(cap_value_t cap);
           int cap_drop_bound(cap_value_t cap);
           #include <sys/types.h>
           cap_t cap_get_pid(pid_t pid);
           Link with -lcap.


           cap_get_proc() allocates a capability state in  working  storage,  sets
           its state to that of the calling process, and returns a pointer to this
           newly created capability state.  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_set_proc() sets the values for all capability flags for  all  capa-
           bilities to the capability state identified by cap_p.  The new capabil-
           ity state of the process will be completely determined by the  contents
           of  cap_p  upon  successful  return from this function.  If any flag in
           cap_p is set for any capability not currently permitted for the calling
           process,  the  function will fail, and the capability state of the pro-
           cess will remain unchanged.
           cap_get_pid() returns cap_d, see cap_init(3), with the process capabil-
           ities  of  the  process indicated by pid.  This information can also be
           obtained from the /proc/<pid>/status file.
           cap_get_bound() with a cap as an argument returns the current value  of
           this  bounding  set  capability flag in effect for the current process.
           This operation  is  unpriveged.  Note,  a  macro  function  CAP_IS_SUP-
           PORTED(cap_value_t  cap)  is provided that evaluates to true (1) if the
           system supports the specified capability, cap.  If the system does  not
           support  the  capability,  this function returns 0. This macro works by
           testing for an error condition with cap_get_bound().
           cap_drop_bound() can be used to lower the specified bounding set  capa-
           bility,  cap,  To complete successfully, the prevailing effective capa-
           bility set must have a raised CAP_SETPCAP.


           POSIX.1e draft specification.  cap_get_pid() is a Linux extension.


           The library also supports the deprecated functions:
           int capgetp(pid_t pid, cap_t cap_d);
           int capsetp(pid_t pid, cap_t cap_d);
           capgetp()  attempts  to  obtain the capabilities of some other process;
           storing the capabilities in a pre-allocated  cap_d.See  cap_init()  for
           information  on  allocating  an  empty  capability  set. This function,
           capgetp(), is deprecated, you should use cap_get_pid().
           capsetp() attempts to set the capabilities of some  other  process(es),
           pid.   If  pid  is  positive it refers to a specific process;  if it is
           zero, it refers to the current process;  -1  refers  to  all  processes
           other  than  the  current  process and process '1' (typically init(8));
           other negative values refer to the -pid process group.  In order to use
           this  function, the kernel must support it and the current process must
           have CAP_SETPCAP raised in its Effective capability set. The  capabili-
           ties  set in the target process(es) are those contained in cap_d.  Ker-
           nels that support filesystem capabilities  redefine  the  semantics  of
           CAP_SETPCAP  and on such systems this function will always fail for any
           target not equal to the current process.  capsetp()  returns  zero  for
           success, and -1 on failure.
           Where  supported  by  the kernel, the function capsetp() should be used
           with care.  It existed, primarily, to overcome an early lack of support
           for  capabilities in the filesystems supported by Linux.  Note that, by
           default, the only processes that have CAP_SETPCAP available to them are
           processes  started  as  a  kernel  thread.   (Typically  this  includes
           init(8), kflushd and kswapd). You will need to recompile the kernel  to
           modify this default.


           The  code segment below raises the CAP_FOWNER and CAP_SETFCAP effective
           capabilities for the caller:
               cap_t caps;
               cap_value_t cap_list[2];
               if (!CAP_IS_SUPPORTED(CAP_SETFCAP))
                   /* handle error */
               caps = cap_get_proc();
               if (caps == NULL)
                   /* handle error */;
               cap_list[0] = CAP_FOWNER;
               cap_list[1] = CAP_SETFCAP;
               if (cap_set_flag(caps, CAP_EFFECTIVE, 2, cap_list, CAP_SET) == -1)
                                      2008-05-11                   CAP_GET_PROC(3)

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