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

       cap_get_proc,  cap_set_proc,  capgetp,  cap_get_bound, cap_drop_bound -
       capability manipulation on processes

       #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
       process 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.

       The functions cap_get_proc() and cap_get_pid() return a non-NULL	 value
       on success, and NULL on failure.

       The  function cap_get_bound() returns -1 if the requested capability is
       unknown, otherwise the return value reflects the current state of  that
       capability in the prevailing bounding set. Note, a macro function,

       The  functions cap_set_proc() and cap_drop_bound() return zero for suc‐
       cess, and -1 on failure.

       On failure, errno is set to EINVAL, EPERM, or ENOMEM.

       cap_set_proc()  and  cap_get_proc()  are	 specified  in	the  withdrawn
       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];

	       /* 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)
	       /* handle error */;

	   if (cap_set_proc(caps) == -1)
	       /* handle error */;

	   if (cap_free(caps) == -1)
	       /* handle error */;

       libcap(3),     cap_clear(3),	cap_copy_ext(3),     cap_from_text(3),
       cap_get_file(3), cap_init(3), capabilities(7)

				  2008-05-11		       CAP_GET_PROC(3)

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