resource_long_value9
Get a value from the hints mechanism
Part of resource_int_value(9).
Usage
#include <sys/param.h>
#include <sys/bus.h>
int
resource_int_value(const char *name, int unit, const char *resname, int *result);
int
resource_long_value(const char *name, int unit, const char *resname, long *result);
int
resource_string_value(const char *name, int unit, const char *resname, const char **result);
Overview
These functions fetch a value from the “hints” mechanism.
The functions take the following arguments:
- name
-
The name of the device to get the resource value from.
- unit
-
The unit number of the device. -1 is special and is used for wildcard entries.
- resname
-
The resource name.
- result
-
A pointer to memory in which to store the resource value.
Return values
If successful, the functions return 0. Otherwise, a non-zero error code is returned.
Errors
The functions will fail if:
- [ENOENT]
-
The resource could not be found.
- [EFTYPE]
-
Inappropriate resource type.