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RedHat 9 (Linux i386) - man page for cap_set_proc (redhat section 3)

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

       cap_get_proc, cap_set_proc - POSIX capability manipulation on processes

       capgetp, capsetp - Linux specific capability manipulation on arbitrary processes

       #include <sys/capability.h>

       cap_t cap_get_proc(void);
       int cap_set_proc(cap_t cap_p);

       #undef _POSIX_SOURCE
       #include <sys/capability.h>

       cap_t capgetp(pid_t pid, cap_t cap_d);
       cap_t capsetp(pid_t pid, cap_t cap_d);

       cc ... -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 capabilities with the  capa-
       bility  state  identified  by cap_p.  The new capability state of the process will be com-
       pletely 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

       capgetp	fills  an  existing  cap_d, see cap_init(3), with the process capabilities of the
       process indicated by pid.  This information can also be obtained from the /proc/<pid>/sta-
       tus file.

       capsetp	attempts to set the capabilities of some other process(es), pid.  If pid is posi-
       tive 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  current	process  must have CAP_SETPCAP raised in its Effective capability
       set.  The capabilities set in the target process(es) are those contained in cap_d.

       cap_get_proc returns a non-NULL value on success, and NULL on failure.

       cap_set_proc, capgetp and capsetp return zero for success, and -1 on failure.

       On failure, errno(3) is set to EINVAL, EPERM, or ENOMEM.

       cap_set_proc and cap_get_proc are functions specified in the draft for POSIX.1e.

       The function capsetp should be used with care.  It exists, primarily, to overcome  a  lack
       of  support  for capabilities in any of the filesystems supported by Linux.  The semantics
       of this function may change as it is better understood.	Please note, 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.

       cap_clear(3), cap_copy_ext(3), cap_from_text(3), cap_get_file(3), cap_init(3)

					  26th May 1997 			  CAP_GET_PROC(3)

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