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

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

       cap_init, cap_free, cap_dup - capability data object storage management

       #include <sys/capability.h>

       cap_t cap_init(void);

       int cap_free(void *obj_d);

       cap_t cap_dup(cap_t cap_p);

       cc ... -lcap

       The  capabilities  associated  with a file or process are never edited directly.  Instead,
       working storage is allocated to contain a representation of the capability  state.   Capa-
       bilities  are  edited and manipulated only within this working storage area.  Once editing
       of the capability state is complete, the updated capability state is used to  replace  the
       capability state associated with the file or process.

       cap_init  creates  a capability state in working storage and return a pointer to the capa-
       bility state.  The initial value of all flags are cleared.  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_free liberates any releasable memory that has been allocated to the	capability  state
       identified  by  obj_d.  The obj_d argument may identify either a cap_t entity, or a char *
       entity allocated by the cap_to_text function.

       cap_dup returns a duplicate capability state in working storage given by the source object
       cap_p, allocating any memory necessary, and returning a pointer to the newly created capa-
       bility state.  Once duplicated, no operation on either capability state affects the  other
       in any way.

       cap_init and cap_dup return a non-NULL value on success, and NULL on failure.

       cap_free returns zero on success, and -1 on failure.

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

       These functions are specified by POSIX.1e.

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

					  26th May 1997 			      CAP_INIT(3)

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