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add util_resolve_subsys_kernel()

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This commit is contained in:
Kay Sievers 2008-10-22 18:03:38 +02:00
parent fcd070d010
commit 14f4025607
3 changed files with 67 additions and 0 deletions
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2
extras/floppy/Makefile.am
View file

@ -10,6 +10,8 @@ create_floppy_devices_SOURCES = \
../../udev/lib/libudev.c \
../../udev/lib/libudev-list.c \
../../udev/lib/libudev-util.c \
../../udev/lib/libudev-device.c \
../../udev/lib/libudev-enumerate.c \
../../udev/udev-util.c
if USE_SELINUX

63
udev/udev-util.c
View file

@ -162,6 +162,69 @@ extern gid_t util_lookup_group(struct udev *udev, const char *group)
return gid;
}
/* handle "[<SUBSYSTEM>/<KERNEL>]<attribute>" format */
int util_resolve_subsys_kernel(struct udev *udev, const char *string,
char *result, size_t maxsize, int read_value)
{
char temp[UTIL_PATH_SIZE];
char *subsys;
char *sysname;
struct udev_device *dev;
char *attr;
if (string == NULL)
string = result;
if (string[0] != '[')
return -1;
util_strlcpy(temp, string, sizeof(temp));
subsys = &temp[1];
sysname = strchr(subsys, '/');
if (sysname == NULL)
return -1;
sysname[0] = '\0';
sysname = &sysname[1];
attr = strchr(sysname, ']');
if (attr == NULL)
return -1;
attr[0] = '\0';
attr = &attr[1];
if (attr[0] == '/')
attr = &attr[1];
if (attr[0] == '\0')
attr = NULL;
if (read_value && attr == NULL)
return -1;
dev = udev_device_new_from_subsystem_sysname(udev, subsys, sysname);
if (dev == NULL)
return -1;
if (read_value) {
const char *val;
val = udev_device_get_sysattr_value(dev, attr);
if (val != NULL)
util_strlcpy(result, val, maxsize);
else
result[0] = '\0';
info(udev, "value '[%s/%s]%s' is '%s'\n", subsys, sysname, attr, result);
} else {
util_strlcpy(result, udev_device_get_syspath(dev), maxsize);
if (attr != NULL) {
util_strlcat(result, "/", maxsize);
util_strlcat(result, attr, maxsize);
}
info(udev, "path '[%s/%s]%s' is '%s'\n", subsys, sysname, attr, result);
}
udev_device_unref(dev);
return 0;
}
int util_run_program(struct udev *udev, const char *command, char **envp,
char *result, size_t ressize, size_t *reslen)
{

2
udev/udev.h
View file

@ -112,6 +112,8 @@ extern uid_t util_lookup_user(struct udev *udev, const char *user);
extern gid_t util_lookup_group(struct udev *udev, const char *group);
extern int util_run_program(struct udev *udev, const char *command, char **envp,
char *result, size_t ressize, size_t *reslen);
extern int util_resolve_subsys_kernel(struct udev *udev, const char *string,
char *result, size_t maxsize, int read_value);
/* udev-selinux.c */
#ifndef USE_SELINUX