346 lines
8.7 KiB
Diff
346 lines
8.7 KiB
Diff
This patch adds bindings to Linux syscalls for which glibc has symbols.
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Using the FFI would have been nice, but that's not an option when using
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a statically-linked Guile in an initrd that doesn't have libc.so around.
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diff --git a/libguile/posix.c b/libguile/posix.c
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index b0fcad5fd..1343186e3 100644
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--- a/libguile/posix.c
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+++ b/libguile/posix.c
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@@ -2341,6 +2341,335 @@ scm_init_popen (void)
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}
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#endif /* HAVE_START_CHILD */
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+
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+/* Linux! */
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+#ifdef __linux__
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+
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+#include <sys/mount.h>
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+#include <sys/syscall.h>
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+
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+#include "libguile/foreign.h"
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+#include "libguile/bytevectors.h"
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+
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+SCM_DEFINE (scm_mount, "mount", 3, 2, 0,
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+ (SCM source, SCM target, SCM type, SCM flags, SCM data),
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+ "Mount file system of @var{type} specified by @var{source} "
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+ "on @var{target}.")
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+#define FUNC_NAME s_scm_mount
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+{
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+ int err;
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+ char *c_source, *c_target, *c_type, *c_data;
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+ unsigned long c_flags;
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+
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+ c_source = scm_to_locale_string (source);
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+ c_target = scm_to_locale_string (target);
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+ c_type = scm_to_locale_string (type);
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+ c_flags = SCM_UNBNDP (flags) ? 0 : scm_to_ulong (flags);
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+
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+ if (SCM_UNBNDP (data) || scm_is_false (data))
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+ c_data = NULL;
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+ else
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+ c_data = scm_to_locale_string (data);
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+
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+ err = mount (c_source, c_target, c_type, c_flags, c_data);
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+ if (err != 0)
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+ err = errno;
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+
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+ free (c_source);
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+ free (c_target);
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+ free (c_type);
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+
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+ if (c_data != NULL)
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+ free (c_data);
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+
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+ if (err != 0)
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+ {
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+ errno = err;
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+ SCM_SYSERROR;
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+ }
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+
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+ return SCM_UNSPECIFIED;
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+}
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+#undef FUNC_NAME
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+
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+SCM_DEFINE (scm_umount, "umount", 1, 0, 0,
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+ (SCM target),
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+ "Unmount the file system on @var{target}.")
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+#define FUNC_NAME s_scm_umount
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+{
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+ int err;
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+ char *c_target;
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+
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+ c_target = scm_to_locale_string (target);
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+
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+ err = umount (c_target);
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+ if (err != 0)
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+ err = errno;
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+
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+ free (c_target);
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+
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+ if (err != 0)
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+ {
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+ errno = err;
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+ SCM_SYSERROR;
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+ }
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+
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+ return SCM_UNSPECIFIED;
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+}
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+#undef FUNC_NAME
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+
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+/* Linux's module installation syscall. See `kernel/module.c' in Linux;
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+ the function itself is part of the GNU libc.
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+
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+ Load the LEN bytes at MODULE as a kernel module, with arguments from
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+ ARGS, a space-separated list of options. */
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+extern long init_module (void *module, unsigned long len, const char *args);
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+
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+/* Load a kernel module from FD. FLAGS must be a bitwise or of
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+ MODULE_INIT_* constants. The GNU libc doesn't provide a wrapper for
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+ this one so we use 'syscall'. */
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+static int
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+finit_module (int fd, const char *args, int flags)
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+{
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+ return syscall (SYS_finit_module, fd, args, flags);
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+}
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+
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+
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+SCM_DEFINE (scm_load_linux_module, "load-linux-module", 1, 1, 0,
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+ (SCM data, SCM options),
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+ "Load the Linux kernel module whose contents are in bytevector "
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+ "DATA (the contents of a @code{.ko} file), with the arguments "
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+ "from the OPTIONS string.")
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+#define FUNC_NAME s_scm_load_linux_module
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+{
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+ long err;
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+ void *c_data;
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+ unsigned long c_len;
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+ char *c_options;
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+
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+ SCM_VALIDATE_BYTEVECTOR (SCM_ARG1, data);
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+
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+ c_data = SCM_BYTEVECTOR_CONTENTS (data);
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+ c_len = SCM_BYTEVECTOR_LENGTH (data);
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+ c_options =
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+ scm_to_locale_string (SCM_UNBNDP (options) ? scm_nullstr : options);
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+
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+ err = init_module (c_data, c_len, c_options);
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+
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+ free (c_options);
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+
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+ if (err != 0)
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+ SCM_SYSERROR;
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+
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+ return SCM_UNSPECIFIED;
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+}
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+#undef FUNC_NAME
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+
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+SCM_DEFINE (scm_load_linux_module_fd, "load-linux-module/fd", 1, 2, 0,
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+ (SCM fd, SCM options, SCM flags),
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+ "Load the Linux kernel module from the file at FD, "
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+ "with the arguments from the OPTIONS string, and "
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+ "optionally the given FLAGS.")
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+#define FUNC_NAME s_scm_load_linux_module_fd
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+{
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+ long err;
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+ int c_fd, c_flags;
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+ char *c_options;
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+
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+ c_fd = scm_to_int (fd);
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+ c_options =
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+ scm_to_locale_string (SCM_UNBNDP (options) ? scm_nullstr : options);
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+ c_flags = SCM_UNBNDP (flags) ? 0 : scm_to_int (flags);
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+
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+ err = finit_module (c_fd, c_options, c_flags);
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+
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+ free (c_options);
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+
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+ if (err != 0)
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+ SCM_SYSERROR;
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+
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+ return SCM_UNSPECIFIED;
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+}
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+#undef FUNC_NAME
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+
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+
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+/* Rebooting, halting, and all that. */
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+
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+#include <sys/reboot.h>
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+
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+SCM_VARIABLE_INIT (flag_RB_AUTOBOOT, "RB_AUTOBOOT",
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+ scm_from_int (RB_AUTOBOOT));
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+SCM_VARIABLE_INIT (flag_RB_HALT_SYSTEM, "RB_HALT_SYSTEM",
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+ scm_from_int (RB_HALT_SYSTEM));
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+SCM_VARIABLE_INIT (flag_RB_ENABLE_CAD, "RB_ENABLE_CAD",
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+ scm_from_int (RB_ENABLE_CAD));
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+SCM_VARIABLE_INIT (flag_RB_DISABLE_CAD, "RB_DISABLE_CAD",
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+ scm_from_int (RB_DISABLE_CAD));
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+SCM_VARIABLE_INIT (flag_RB_POWER_OFF, "RB_POWER_OFF",
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+ scm_from_int (RB_POWER_OFF));
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+SCM_VARIABLE_INIT (flag_RB_SW_SUSPEND, "RB_SW_SUSPEND",
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+ scm_from_int (RB_SW_SUSPEND));
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+SCM_VARIABLE_INIT (flag_RB_KEXEC, "RB_KEXEC",
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+ scm_from_int (RB_KEXEC));
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+
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+SCM_DEFINE (scm_reboot, "reboot", 0, 1, 0,
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+ (SCM command),
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+ "Reboot the system. @var{command} must be one of the @code{RB_} "
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+ "constants; if omitted, @var{RB_AUTOBOOT} is used, thus "
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+ "performing a hard reset.")
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+#define FUNC_NAME s_scm_reboot
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+{
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+ int c_command;
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+
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+ if (SCM_UNBNDP (command))
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+ c_command = RB_AUTOBOOT;
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+ else
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+ c_command = scm_to_int (command);
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+
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+ reboot (c_command);
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+
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+ return SCM_UNSPECIFIED; /* likely unreached */
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+}
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+#undef FUNC_NAME
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+
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+/* Linux network interfaces. See <linux/if.h>. */
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+
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+#include <linux/if.h>
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+#include <linux/sockios.h>
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+#include "libguile/socket.h"
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+
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+SCM_VARIABLE_INIT (flag_IFF_UP, "IFF_UP",
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+ scm_from_int (IFF_UP));
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+SCM_VARIABLE_INIT (flag_IFF_BROADCAST, "IFF_BROADCAST",
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+ scm_from_int (IFF_BROADCAST));
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+SCM_VARIABLE_INIT (flag_IFF_DEBUG, "IFF_DEBUG",
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+ scm_from_int (IFF_DEBUG));
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+SCM_VARIABLE_INIT (flag_IFF_LOOPBACK, "IFF_LOOPBACK",
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+ scm_from_int (IFF_LOOPBACK));
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+SCM_VARIABLE_INIT (flag_IFF_POINTOPOINT, "IFF_POINTOPOINT",
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+ scm_from_int (IFF_POINTOPOINT));
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+SCM_VARIABLE_INIT (flag_IFF_NOTRAILERS, "IFF_NOTRAILERS",
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+ scm_from_int (IFF_NOTRAILERS));
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+SCM_VARIABLE_INIT (flag_IFF_RUNNING, "IFF_RUNNING",
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+ scm_from_int (IFF_RUNNING));
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+SCM_VARIABLE_INIT (flag_IFF_NOARP, "IFF_NOARP",
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+ scm_from_int (IFF_NOARP));
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+SCM_VARIABLE_INIT (flag_IFF_PROMISC, "IFF_PROMISC",
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+ scm_from_int (IFF_PROMISC));
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+SCM_VARIABLE_INIT (flag_IFF_ALLMULTI, "IFF_ALLMULTI",
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+ scm_from_int (IFF_ALLMULTI));
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+
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+SCM_DEFINE (scm_set_network_interface_address, "set-network-interface-address",
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+ 3, 0, 0,
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+ (SCM socket, SCM name, SCM address),
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+ "Configure network interface @var{name}.")
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+#define FUNC_NAME s_scm_set_network_interface_address
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+{
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+ char *c_name;
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+ struct ifreq ifr;
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+ struct sockaddr *c_address;
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+ size_t sa_len;
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+ int fd, err;
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+
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+ socket = SCM_COERCE_OUTPORT (socket);
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+ SCM_VALIDATE_OPFPORT (1, socket);
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+ fd = SCM_FPORT_FDES (socket);
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+
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+ memset (&ifr, 0, sizeof ifr);
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+ c_name = scm_to_locale_string (name);
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+ c_address = scm_to_sockaddr (address, &sa_len);
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+
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+ strncpy (ifr.ifr_name, c_name, sizeof ifr.ifr_name - 1);
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+ memcpy (&ifr.ifr_addr, c_address, sa_len);
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+
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+ err = ioctl (fd, SIOCSIFADDR, &ifr);
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+ if (err != 0)
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+ err = errno;
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+
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+ free (c_name);
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+ free (c_address);
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+
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+ if (err != 0)
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+ {
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+ errno = err;
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+ SCM_SYSERROR;
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+ }
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+
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+ return SCM_UNSPECIFIED;
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+}
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+#undef FUNC_NAME
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+
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+SCM_DEFINE (scm_set_network_interface_flags, "set-network-interface-flags",
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+ 3, 0, 0,
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+ (SCM socket, SCM name, SCM flags),
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+ "Change the flags of network interface @var{name} to "
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+ "@var{flags}.")
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+#define FUNC_NAME s_scm_set_network_interface_flags
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+{
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+ struct ifreq ifr;
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+ char *c_name;
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+ int fd, err;
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+
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+ socket = SCM_COERCE_OUTPORT (socket);
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+ SCM_VALIDATE_OPFPORT (1, socket);
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+ fd = SCM_FPORT_FDES (socket);
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+
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+ memset (&ifr, 0, sizeof ifr);
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+ c_name = scm_to_locale_string (name);
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+ strncpy (ifr.ifr_name, c_name, sizeof ifr.ifr_name - 1);
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+ ifr.ifr_flags = scm_to_short (flags);
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+
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+ err = ioctl (fd, SIOCSIFFLAGS, &ifr);
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+ if (err != 0)
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+ err = errno;
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+
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+ free (c_name);
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+
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+ if (err != 0)
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+ {
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+ errno = err;
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+ SCM_SYSERROR;
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+ }
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+
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+ return SCM_UNSPECIFIED;
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+}
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+#undef FUNC_NAME
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+
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+SCM_DEFINE (scm_network_interface_flags, "network-interface-flags",
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+ 2, 0, 0,
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+ (SCM socket, SCM name),
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+ "Return the flags of network interface @var{name}.")
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+#define FUNC_NAME s_scm_network_interface_flags
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+{
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+ struct ifreq ifr;
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+ char *c_name;
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+ int fd, err;
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+
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+ socket = SCM_COERCE_OUTPORT (socket);
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+ SCM_VALIDATE_OPFPORT (1, socket);
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+ fd = SCM_FPORT_FDES (socket);
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+
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+ memset (&ifr, 0, sizeof ifr);
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+ c_name = scm_to_locale_string (name);
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+ strncpy (ifr.ifr_name, c_name, sizeof ifr.ifr_name - 1);
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+
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+ err = ioctl (fd, SIOCGIFFLAGS, &ifr);
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+ if (err != 0)
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+ err = errno;
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+
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+ free (c_name);
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+
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+ if (err != 0)
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+ {
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+ errno = err;
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+ SCM_SYSERROR;
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+ }
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+
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+ return scm_from_short (ifr.ifr_flags);
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+}
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+#undef FUNC_NAME
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+#endif
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+
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void
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scm_init_posix ()
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{
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