int uname(struct utsname *utsbuf)
{
static struct {
struct _uzisysinfoblk i;
char buf[128];
} uts;
char *x[5];
int bytes = _uname(&uts.i, sizeof(uts));
char *p = uts.buf;
char *xp = x[0];
int ct = 0;
if (bytes == -1)
return bytes;
x[0] = utsbuf->release;
x[1] = utsbuf->sysname;
x[2] = utsbuf->version;
x[2] = utsbuf->machine;
bytes -= sizeof(struct _uzisysinfoblk);
while(xp = x[ct++]) {
do {
*xp++=*p++;
bytes--;
}
while(*p && bytes);
}
return 0;
}
long sysconf(int name)
{
struct _uzisysinfoblk info;
int psize;
int pscale;
_uname(&info, sizeof(info));
psize = 65536/info.banks;
pscale = psize/1024;
switch(name) {
case _SC_ARG_MAX:
return 512;
case _SC_CHILD_MAX:
/* nproc -1 ? */
case _SC_HOST_NAME_MAX:
/* we will implement get/sethostname and domain name in userspace */
return 256;
case _SC_LOGIN_NAME_MAX:
return 32;
case _SC_CLK_TCK:
/* query via unameinfo */
return info.ticks;
case _SC_OPEN_MAX:
/* query via unameinfo */
return info.max_open;
case _SC_PAGESIZE:
/* query via unameinfo */
return psize;
case _SC_RE_DUP_MAX:
/* FIXME: read the regexp code */
return 4;
case _SC_STREAM_MAX:
/* In theory down to RAM */
return 256;
case _SC_SYMLOOP_MAX:
/* Not supported yet */
return 1;
case _SC_TTY_NAME_MAX:
return 9;
case _SC_TZNAME_MAX:
return 6;
/* Don't provide _SC_VERSION - we don't really meet POSIX! */
case _SC_VERSION:
return 0;
case _SC_PHYS_PAGES:
return info.memk/pscale;
case _SC_AVPHYS_PAGES:
return (info.memk-info.usedk)/pscale;
case _SC_NPROCESSORS_CONF:
case _SC_NPROCESSORS_ONLN:
return 1;
default:
errno = EINVAL;
return -1;
}
}
/*
* gethostname bsd compatibility
*/
int
gethostname(char *hname, int hlen)
{
struct utsname u;
#if defined(__i386) && !defined(__amd64)
if (_nuname(&u) < 0) {
#else
if (_uname(&u) < 0) {
#endif /* __i386 */
return (-1);
}
(void) strncpy(hname, u.nodename, hlen);
return (0);
}
int
uname(struct utsname * n)
{
if (KVER_NOT_INITIALIZED)
kver_initialize();
if (KVER_BADLY_INITIALIZED)
return _uname(n);
(void) strncpy(n->sysname, real_utsname.sysname, _SYS_NMLN);
(void) strncpy(n->nodename, real_utsname.nodename, _SYS_NMLN);
(void) strncpy(n->release, kver.osrelease, _SYS_NMLN);
(void) strncpy(n->version, kver.version, _SYS_NMLN);
(void) strncpy(n->machine, real_utsname.machine, _SYS_NMLN);
return 0;
}
void _start(void)
{
struct utsname name;
const char text_sysname[] = "sysname: ";
const char text_nodename[] = "nodename: ";
const char text_release[] = "release: ";
const char text_version[] = "version: ";
const char text_machine[] = "machine: ";
const char text_domainname[] = "domainname: ";
char buffer[sizeof(text_sysname) + sizeof(name.sysname) +
sizeof(text_nodename) + sizeof(name.nodename) +
sizeof(text_release) + sizeof(name.release) +
sizeof(text_version) + sizeof(name.version) +
sizeof(text_machine) + sizeof(name.machine) +
sizeof(text_domainname) + sizeof(name.domainname) + 1];
char *ptr;
if (_uname(&name) < 0) {
write_string(2, "Error: uname failed\n");
exit(1);
}
ptr = buffer;
ptr = stplcpy(ptr, text_sysname, sizeof(text_sysname) - 1);
ptr = stplcpy(ptr, name.sysname, sizeof(name.sysname));
*ptr++ = '\n';
ptr = stplcpy(ptr, text_nodename, sizeof(text_nodename) - 1);
ptr = stplcpy(ptr, name.nodename, sizeof(name.nodename));
*ptr++ = '\n';
ptr = stplcpy(ptr, text_release, sizeof(text_release) - 1);
ptr = stplcpy(ptr, name.release, sizeof(name.release));
*ptr++ = '\n';
ptr = stplcpy(ptr, text_version, sizeof(text_version) - 1);
ptr = stplcpy(ptr, name.version, sizeof(name.version));
*ptr++ = '\n';
ptr = stplcpy(ptr, text_machine, sizeof(text_machine) - 1);
ptr = stplcpy(ptr, name.machine, sizeof(name.machine));
*ptr++ = '\n';
ptr = stplcpy(ptr, text_domainname, sizeof(text_domainname) - 1);
ptr = stplcpy(ptr, name.domainname, sizeof(name.domainname));
*ptr++ = '\n';
write_all(1, buffer, (size_t)(ptr - buffer));
exit(0);
}
/*
* FIXME Update bitset in long-running process if dm claims new major numbers.
*/
static int _create_dm_bitset(void)
{
#ifdef DM_IOCTLS
if (_dm_bitset || _dm_device_major)
return 1;
if (!_uname())
return 0;
/*
* 2.6 kernels are limited to one major number.
* Assume 2.4 kernels are patched not to.
* FIXME Check _dm_version and _dm_version_minor if 2.6 changes this.
*/
if (KERNEL_VERSION(_kernel_major, _kernel_minor, _kernel_release) >=
KERNEL_VERSION(2, 6, 0))
_dm_multiple_major_support = 0;
if (!_dm_multiple_major_support) {
if (!_get_proc_number(PROC_DEVICES, DM_NAME, &_dm_device_major))
return 0;
return 1;
}
/* Multiple major numbers supported */
if (!(_dm_bitset = dm_bitset_create(NULL, NUMBER_OF_MAJORS)))
return 0;
if (!_get_proc_number(PROC_DEVICES, DM_NAME, NULL)) {
dm_bitset_destroy(_dm_bitset);
_dm_bitset = NULL;
return 0;
}
return 1;
#else
return 0;
#endif
}
static void
kver_initialize(void)
{
char *v;
int i;
kver.osrevision = KVER_INVALID_OSRELEASE; /* init done */
v = getenv(VAR_LIBKVER_OSRELEASE);
if (v == NULL) {
char b[MAXPATHLEN + 1];
i = readlink(PATH_LIBKVER_OSRELEASE, b, sizeof b - 1);
if (i <= 0) {
v = NULL;
} else {
b[i] = '\0';
v = b;
}
}
if (v == NULL) {
warnx("libkver: not configured");
return;
}
if (_uname(&real_utsname) != 0) {
warn("libkver: uname");
return;
}
kver.osrevision = str2osrevision(v);
if (kver.osrevision == KVER_INVALID_OSRELEASE) {
warnx("libkver: invalid version: %s", v);
return;
}
(void) strncpy(kver.osrelease, v, _SYS_NMLN);
kver.osrelease[_SYS_NMLN - 1] = '\0';
(void) snprintf(kver.version, _SYS_NMLN, KVER_VERSION_FMT,
kver.osrelease, real_utsname.machine);
return;
}
static int _open_control(void)
{
#ifdef DM_IOCTLS
char control[PATH_MAX];
uint32_t major = 0, minor;
int dm_mod_autoload_support, needs_open;
if (_control_fd != -1)
return 1;
if (!_uname())
return 0;
snprintf(control, sizeof(control), "%s/%s", dm_dir(), DM_CONTROL_NODE);
/*
* dm-mod autoloading is supported since kernel 2.6.36.
* Udev daemon will try to read modules.devname file extracted
* by depmod and create any static nodes needed.
* The /dev/mapper/control node can be created and prepared this way.
* First access to such node should load dm-mod module automatically.
*/
dm_mod_autoload_support = KERNEL_VERSION(_kernel_major, _kernel_minor,
_kernel_release) >= KERNEL_VERSION(2, 6, 36);
/*
* If dm-mod autoloading is supported and the control node exists
* already try to open it now. This should autoload dm-mod module.
*/
if (dm_mod_autoload_support) {
if (!_get_proc_number(PROC_DEVICES, MISC_NAME, &major))
/* If major not found, just fallback to hardcoded value. */
major = MISC_MAJOR;
/* Recreate the node with correct major and minor if needed. */
if (!_control_exists(control, major, MAPPER_CTRL_MINOR) &&
!_create_control(control, major, MAPPER_CTRL_MINOR))
goto error;
_open_and_assign_control_fd(control, 1);
}
/*
* Get major and minor number assigned for the control node.
* In case we make use of the module autoload support, this
* information should be accessible now as well.
*/
if (!_control_device_number(&major, &minor))
log_error("Is device-mapper driver missing from kernel?");
/*
* Check the control node and its major and minor number.
* If there's anything wrong, remove the old node and create
* a correct one.
*/
if ((needs_open = !_control_exists(control, major, minor)) &&
!_create_control(control, major, minor)) {
_close_control_fd();
goto error;
}
/*
* For older kernels without dm-mod autoloading support, we always
* need to open the control node here - we still haven't done that!
* For newer kernels with dm-mod autoloading, we open it only if the
* node was recreated and corrected in previous step.
*/
if ((!dm_mod_autoload_support || needs_open) &&
!_open_and_assign_control_fd(control, 0))
goto error;
if (!_create_dm_bitset()) {
log_error("Failed to set up list of device-mapper major numbers");
return 0;
}
return 1;
error:
log_error("Failure to communicate with kernel device-mapper driver.");
return 0;
#else
return 1;
#endif
}
