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efivars_procfs.[ch] - Manipulates EFI variables as exported in /proc/efi/vars
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Copyright (C) 2001,2003 Dell Computer Corporation <Matt_Domsch@dell.com>
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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#define _FILE_OFFSET_BITS 64
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#include <sys/types.h>
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#include "efibootmgr.h"
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#include "efivars_procfs.h"
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procfs_read_variable(const char *name, efi_variable_t *var)
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char filename[PATH_MAX];
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if (!name || !var) return EFI_INVALID_PARAMETER;
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snprintf(filename, PATH_MAX-1, "%s/%s", PROCFS_DIR_EFI_VARS,name);
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fd = open(filename, O_RDONLY);
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readsize = read(fd, var, sizeof(*var));
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if (readsize != sizeof(*var)) {
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return EFI_INVALID_PARAMETER;
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* select_variable_names()
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* @d - dirent to compare against
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* This ignores "." and ".." entries, and selects all others.
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select_variable_names(const struct dirent *d)
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if (!strcmp(d->d_name, ".") ||
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!strcmp(d->d_name, ".."))
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* @var - variable to be written
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* @file - name of file to open for writing @var is returned.
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* This ignores "." and ".." entries, and selects all others.
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find_write_victim(efi_variable_t *var, char file[PATH_MAX])
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struct dirent **namelist = NULL;
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char testname[PATH_MAX], *p;
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memset(testname, 0, sizeof(testname));
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n = scandir(PROCFS_DIR_EFI_VARS, &namelist,
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select_variable_names, alphasort);
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efichar_to_char(p, var->VariableName, PATH_MAX);
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p += sprintf(p, "-");
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efi_guid_unparse(&var->VendorGuid, p);
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for (i=0; i<n; i++) {
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strncmp(testname, namelist[i]->d_name, sizeof(testname))) {
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sprintf(file, "%s/%s", PROCFS_DIR_EFI_VARS,
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namelist[i]->d_name);
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if (!found) return NULL;
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procfs_write_variable(efi_variable_t *var)
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char buffer[PATH_MAX], name[PATH_MAX], *p = NULL;
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if (!var) return EFI_INVALID_PARAMETER;
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memset(buffer, 0, sizeof(buffer));
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memset(name, 0, sizeof(name));
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p = find_write_victim(var, name);
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if (!p) return EFI_INVALID_PARAMETER;
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fd = open(name, O_WRONLY);
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sprintf(buffer, "write_variable():open(%s)", name);
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return EFI_INVALID_PARAMETER;
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writesize = write(fd, var, sizeof(*var));
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if (writesize != sizeof(*var)) {
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return EFI_INVALID_PARAMETER;
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procfs_delete_variable(efi_variable_t *var)
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if (!var) return EFI_INVALID_PARAMETER;
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return procfs_write_variable(var);
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procfs_edit_variable(const char *unused, efi_variable_t *var)
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if (!var) return EFI_INVALID_PARAMETER;
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return procfs_write_variable(var);
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struct efivar_kernel_calls procfs_kernel_calls = {
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.read = procfs_read_variable,
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.edit = procfs_edit_variable,
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.create = procfs_write_variable,
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.delete = procfs_delete_variable,
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.path = PROCFS_DIR_EFI_VARS,