efi_guid_to_str man page on Manjaro

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       efi_variables_supported,	      efi_del_variable,	     efi_get_variable,
       efi_get_variable_attributes, efi_get_variable_size, efi_set_variable  -
       manipulate UEFI variables

       #include <efivar.h>

       int efi_variables_supported(void);
       int efi_del_variable(efi_guid_t guid, const char *name);

       int efi_get_variable(efi_guid_t guid, const char *name,
			    void **data, ssize_t *data_size,
			    uint32_t *attributes);

       int efi_get_variable_attributes(efi_guid_t guid, const char *name,
				       uint32_t *attributes);

       int efi_get_variable_size(efi_guid_t guid, const char *name,
				 size_t *size);

       int efi_append_variable(efi_guid_t guid, const char *name,
			    void *data, size_t data_size,
			    uint32_t attributes);

       int efi_set_variable(efi_guid_t guid, const char *name,
			    void *data, size_t data_size,
			    uint32_t attributes);

       int efi_get_next_variable_name(efi_guid_t **guid, char **name);

       int efi_str_to_guid(const char *s, efi_guid_t *guid);

       int efi_guid_to_str(const efi_guid_t *guid, char **sp);

       int efi_name_to_guid(const char *name, efi_guid_t *guid);

       int efi_guid_to_name(efi_guid_t *guid, char **name);

       int efi_guid_to_symbol(efi_guid_t *guid, char **symbol);

       efi_variables_supported()  tests	 if the UEFI variable facility is sup‐
       ported on the current machine.

       efi_del_variable() deletes the variable specified by guid and name.

       efi_get_variable() gets the variable specified by guid  and  name.  The
       value  is stored in data, its size in data_size, and its attributes are
       stored in attributes.

       efi_get_variable_attributes() gets attributes for the  variable	speci‐
       fied by guid and name.

       efi_get_variable_size()	gets  the  size	 of  the data for the variable
       specified by guid and name.

       efi_append_variable() appends data of size size to the variable	speci‐
       fied by guid and name.

       efi_set_variable() sets the variable specified by guid and name.

       efi_get_next_variable_name() iterates across the currently extant vari‐
       ables, passing back a guid and name.

       efi_str_to_guid() parses a UEFI GUID from string form to an  efi_guid_t
       the caller provides

       efi_guid_to_str()  allocates  a	suitable  string and populates it with
       string representation of a UEFI GUID.  It is the caller's  responsibil‐
       ity to free this string.

       efi_name_to_guid()  translates  from a well known name to an efi_guid_t
       the caller provides.

       efi_guid_to_name() translates from an efi_guid_t to a well known	 name.
       If  the supplied GUID does not have a well known name, this function is
       equivalent to efi_guid_to_str().

       efi_guid_to_symbol() translates from an efi_guid_t to a unique  (within
       libefivar)  C-sytle  symbol  name.   These  symbol names are useful for
       printing as a unique, easily parsed identifier, and are also provide by
       the library and its header files.

       efi_variables_supported()  returns  true	 if variables are supported on
       the running hardware, and false if they are not.

       efi_get_next_variable_name() returns 0 when iteration has completed,  1
       when  iteration has not completed, and -1 on error.  In the event of an
       error, errno(3) is set appropriately.

       efi_del_variable(), efi_get_variable(),	efi_get_variable_attributes(),
       efi_get_variable_size(),	  efi_append_variable(),   efi_set_variable(),
       efi_str_to_guid(),    efi_guid_to_str(),	   efi_name_to_guid(),	   and
       efi_guid_to_name() return negative on error and zero on success.

       Peter Jones <pjones@redhat.com>

				Thu Aug 20 2012		   EFI_GET_VARIABLE(3)

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