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Update to device enumeration protocol 2

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The new protocol from the kernel encodes things as a string table,
extract it into fields. strdup the strings, and free them when we're
done.

Differential Revision: https://reviews.freebsd.org/D15629
This commit is contained in:
Warner Losh 2018-05-31 02:58:03 +00:00
parent c580ca4cf4
commit cf72c10fd2
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=334415
2 changed files with 33 additions and 19 deletions
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42
lib/libdevinfo/devinfo.c
View File

@ -175,7 +175,7 @@ devinfo_init_devices(int generation)
int name2oid[2];
int oid[CTL_MAXNAME + 12];
size_t oidlen, rlen;
char *name;
char *name, *walker, *ep;
int error;
/*
@ -229,22 +229,31 @@ devinfo_init_devices(int generation)
return(ENOMEM);
dd->dd_dev.dd_handle = udev.dv_handle;
dd->dd_dev.dd_parent = udev.dv_parent;
snprintf(dd->dd_name, sizeof(dd->dd_name), "%s", udev.dv_name);
dd->dd_dev.dd_name = &dd->dd_name[0];
snprintf(dd->dd_desc, sizeof(dd->dd_desc), "%s", udev.dv_desc);
dd->dd_dev.dd_desc = &dd->dd_desc[0];
snprintf(dd->dd_drivername, sizeof(dd->dd_drivername), "%s",
udev.dv_drivername);
dd->dd_dev.dd_drivername = &dd->dd_drivername[0];
snprintf(dd->dd_pnpinfo, sizeof(dd->dd_pnpinfo), "%s",
udev.dv_pnpinfo);
dd->dd_dev.dd_pnpinfo = &dd->dd_pnpinfo[0];
snprintf(dd->dd_location, sizeof(dd->dd_location), "%s",
udev.dv_location);
dd->dd_dev.dd_location = &dd->dd_location[0];
dd->dd_dev.dd_devflags = udev.dv_devflags;
dd->dd_dev.dd_flags = udev.dv_flags;
dd->dd_dev.dd_state = udev.dv_state;
walker = udev.dv_fields;
ep = walker + sizeof(udev.dv_fields);
dd->dd_name = NULL;
dd->dd_desc = NULL;
dd->dd_drivername = NULL;
dd->dd_pnpinfo = NULL;
dd->dd_location = NULL;
#define UNPACK(x) \
dd->dd_dev.x = dd->x = strdup(walker); \
if (dd->x == NULL) \
return(ENOMEM); \
if (walker + strnlen(walker, ep - walker) >= ep) \
return(EINVAL); \
walker += strlen(walker) + 1;
UNPACK(dd_name);
UNPACK(dd_desc);
UNPACK(dd_drivername);
UNPACK(dd_pnpinfo);
UNPACK(dd_location);
#undef UNPACK
TAILQ_INSERT_TAIL(&devinfo_dev, dd, dd_link);
}
debug("fetched %d devices", dev_idx);
@ -367,6 +376,11 @@ devinfo_free(void)
while ((dd = TAILQ_FIRST(&devinfo_dev)) != NULL) {
TAILQ_REMOVE(&devinfo_dev, dd, dd_link);
free(dd->dd_name);
free(dd->dd_desc);
free(dd->dd_drivername);
free(dd->dd_pnpinfo);
free(dd->dd_location);
free(dd);
}
while ((dm = TAILQ_FIRST(&devinfo_rman)) != NULL) {

10
lib/libdevinfo/devinfo_var.h
View File

@ -45,11 +45,11 @@
*/
struct devinfo_i_dev {
struct devinfo_dev dd_dev;
char dd_name[DEVINFO_STRLEN];
char dd_desc[DEVINFO_STRLEN];
char dd_drivername[DEVINFO_STRLEN];
char dd_pnpinfo[DEVINFO_STRLEN * 4];
char dd_location[DEVINFO_STRLEN * 4];
char *dd_name;
char *dd_desc;
char *dd_drivername;
char *dd_pnpinfo;
char *dd_location;
uint32_t dd_devflags;
uint16_t dd_flags;
device_state_t dd_state;