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

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

NAME
cap_copy_ext, cap_size, cap_copy_int - capability state external representation translation
SYNOPSIS
#include <sys/capability.h> ssize_t cap_size(cap_t cap_p); ssize_t cap_copy_ext(void *ext_p, cap_t cap_p, ssize_t size); cap_t cap_copy_int(const void *ext_p);
USAGE
cc ... -lcap
DESCRIPTION
These functions translate a capability state from an internal representation into an external one. The exter- nal representation is an exportable, contiguous, persistent representation of a capability state in user-man- aged space. The internal representation is managed by the capability functions in working storage. cap_size returns the total length (in bytes) that the capability state in working storage identified by cap_p would require when converted by cap_copy_ext. This function is used primarily to determine the amount of buf- fer space that must be provided to the cap_copy_ext function in order to hold the capability data record cre- ated from cap_p. cap_copy_ext copies a capability state in working storage, identified by cap_p, from system managed space to user-managed space (pointed to by ext_p) and returns the length of the resulting data record. The size param- eter represents the maximum size, in bytes, of the resulting data record. The cap_copy_ext function will do any conversions necessary to convert the capability state from the undefined internal format to an exportable, contiguous, persistent data record. It is the responsibility of the user to allocate a buffer large enough to hold the copied data. The buffer length required to hold the copied data may be obtained by a call to the cap_size function. cap_copy_int copies a capability state from a capability data record in user-managed space to a new capability state in working storage, allocating any memory necessary, and returning a pointer to the newly created capa- bility state. The function initializes the capability state and then copies the capability state from the record painted to by ext_p into the capability state, converting, if necessary, the data from a contiguous, persistent format to an undefined, internal format. Once copied into internal format, the object can be manipulated by the capability state manipulation functions. Note that the record pointed to by ext_p must have been obtained from a previous, successful call to cap_copy_ext for this function to work successfully. 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.
RETURN VALUE
cap_size returns the length required to hold a capability data record on success, and -1 on failure. cap_copy_ext returns the number of bytes placed in the user managed space pointed to by ext_p on success, and -1 on failure. cap_copy_int returns a pointer to the newly created capability state in working storage on success, and NULL on failure. On failure, errno(3) is set to EINVAL, ENOMEM, or ERANGE.
CONFORMING TO
These functions are specified by POSIX.1e.
SEE ALSO
cap_clear(3), cap_from_text(3), cap_get_file(3), cap_get_proc(3), cap_init(3) 26th May 1997 CAP_COPY_EXT(3)


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