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

       cap_get_proc,  cap_set_proc,  capgetp - capability manipulation on pro‐

       #include <sys/capability.h>

       cap_t cap_get_proc(void);

       int cap_set_proc(cap_t cap_p);

       #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.

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

       The function cap_set_proc() return zero for success, 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       cap_set_proc()  and  cap_get_proc()  are	 specified  in	the  withdrawn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];

	   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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