diff options
Diffstat (limited to 'samples')
| -rw-r--r-- | samples/hidraw/Makefile | 2 | ||||
| -rw-r--r-- | samples/hidraw/hid-example.c | 6 | ||||
| -rw-r--r-- | samples/kobject/kobject-example.c | 16 | ||||
| -rw-r--r-- | samples/kobject/kset-example.c | 16 | ||||
| -rw-r--r-- | samples/trace_events/trace-events-sample.h | 84 |
5 files changed, 113 insertions, 11 deletions
diff --git a/samples/hidraw/Makefile b/samples/hidraw/Makefile index 382eeae..a9ab961 100644 --- a/samples/hidraw/Makefile +++ b/samples/hidraw/Makefile @@ -8,3 +8,5 @@ hostprogs-y := hid-example always := $(hostprogs-y) HOSTCFLAGS_hid-example.o += -I$(objtree)/usr/include + +all: hid-example diff --git a/samples/hidraw/hid-example.c b/samples/hidraw/hid-example.c index 512a7e5..92e6c15 100644 --- a/samples/hidraw/hid-example.c +++ b/samples/hidraw/hid-example.c @@ -46,10 +46,14 @@ int main(int argc, char **argv) char buf[256]; struct hidraw_report_descriptor rpt_desc; struct hidraw_devinfo info; + char *device = "/dev/hidraw0"; + + if (argc > 1) + device = argv[1]; /* Open the Device with non-blocking reads. In real life, don't use a hard coded path; use libudev instead. */ - fd = open("/dev/hidraw0", O_RDWR|O_NONBLOCK); + fd = open(device, O_RDWR|O_NONBLOCK); if (fd < 0) { perror("Unable to open device"); diff --git a/samples/kobject/kobject-example.c b/samples/kobject/kobject-example.c index 01562e0..2e0740f 100644 --- a/samples/kobject/kobject-example.c +++ b/samples/kobject/kobject-example.c @@ -36,7 +36,12 @@ static ssize_t foo_show(struct kobject *kobj, struct kobj_attribute *attr, static ssize_t foo_store(struct kobject *kobj, struct kobj_attribute *attr, const char *buf, size_t count) { - sscanf(buf, "%du", &foo); + int ret; + + ret = kstrtoint(buf, 10, &foo); + if (ret < 0) + return ret; + return count; } @@ -63,9 +68,12 @@ static ssize_t b_show(struct kobject *kobj, struct kobj_attribute *attr, static ssize_t b_store(struct kobject *kobj, struct kobj_attribute *attr, const char *buf, size_t count) { - int var; + int var, ret; + + ret = kstrtoint(buf, 10, &var); + if (ret < 0) + return ret; - sscanf(buf, "%du", &var); if (strcmp(attr->attr.name, "baz") == 0) baz = var; else @@ -134,5 +142,5 @@ static void __exit example_exit(void) module_init(example_init); module_exit(example_exit); -MODULE_LICENSE("GPL"); +MODULE_LICENSE("GPL v2"); MODULE_AUTHOR("Greg Kroah-Hartman <greg@kroah.com>"); diff --git a/samples/kobject/kset-example.c b/samples/kobject/kset-example.c index ab5e447..a55bff5 100644 --- a/samples/kobject/kset-example.c +++ b/samples/kobject/kset-example.c @@ -120,7 +120,12 @@ static ssize_t foo_show(struct foo_obj *foo_obj, struct foo_attribute *attr, static ssize_t foo_store(struct foo_obj *foo_obj, struct foo_attribute *attr, const char *buf, size_t count) { - sscanf(buf, "%du", &foo_obj->foo); + int ret; + + ret = kstrtoint(buf, 10, &foo_obj->foo); + if (ret < 0) + return ret; + return count; } @@ -147,9 +152,12 @@ static ssize_t b_show(struct foo_obj *foo_obj, struct foo_attribute *attr, static ssize_t b_store(struct foo_obj *foo_obj, struct foo_attribute *attr, const char *buf, size_t count) { - int var; + int var, ret; + + ret = kstrtoint(buf, 10, &var); + if (ret < 0) + return ret; - sscanf(buf, "%du", &var); if (strcmp(attr->attr.name, "baz") == 0) foo_obj->baz = var; else @@ -277,5 +285,5 @@ static void __exit example_exit(void) module_init(example_init); module_exit(example_exit); -MODULE_LICENSE("GPL"); +MODULE_LICENSE("GPL v2"); MODULE_AUTHOR("Greg Kroah-Hartman <greg@kroah.com>"); diff --git a/samples/trace_events/trace-events-sample.h b/samples/trace_events/trace-events-sample.h index a2c8b02..8965d1b 100644 --- a/samples/trace_events/trace-events-sample.h +++ b/samples/trace_events/trace-events-sample.h @@ -22,7 +22,25 @@ * protection, just like TRACE_INCLUDE_FILE. */ #undef TRACE_SYSTEM -#define TRACE_SYSTEM sample +#define TRACE_SYSTEM sample-trace + +/* + * TRACE_SYSTEM is expected to be a C valid variable (alpha-numeric + * and underscore), although it may start with numbers. If for some + * reason it is not, you need to add the following lines: + */ +#undef TRACE_SYSTEM_VAR +#define TRACE_SYSTEM_VAR sample_trace +/* + * But the above is only needed if TRACE_SYSTEM is not alpha-numeric + * and underscored. By default, TRACE_SYSTEM_VAR will be equal to + * TRACE_SYSTEM. As TRACE_SYSTEM_VAR must be alpha-numeric, if + * TRACE_SYSTEM is not, then TRACE_SYSTEM_VAR must be defined with + * only alpha-numeric and underscores. + * + * The TRACE_SYSTEM_VAR is only used internally and not visible to + * user space. + */ /* * Notice that this file is not protected like a normal header. @@ -180,8 +198,30 @@ static inline int __length_of(const int *list) ; return i; } + +enum { + TRACE_SAMPLE_FOO = 2, + TRACE_SAMPLE_BAR = 4, + TRACE_SAMPLE_ZOO = 8, +}; #endif +/* + * If enums are used in the TP_printk(), their names will be shown in + * format files and not their values. This can cause problems with user + * space programs that parse the format files to know how to translate + * the raw binary trace output into human readable text. + * + * To help out user space programs, any enum that is used in the TP_printk() + * should be defined by TRACE_DEFINE_ENUM() macro. All that is needed to + * be done is to add this macro with the enum within it in the trace + * header file, and it will be converted in the output. + */ + +TRACE_DEFINE_ENUM(TRACE_SAMPLE_FOO); +TRACE_DEFINE_ENUM(TRACE_SAMPLE_BAR); +TRACE_DEFINE_ENUM(TRACE_SAMPLE_ZOO); + TRACE_EVENT(foo_bar, TP_PROTO(const char *foo, int bar, const int *lst, @@ -206,7 +246,47 @@ TRACE_EVENT(foo_bar, __assign_bitmask(cpus, cpumask_bits(mask), num_possible_cpus()); ), - TP_printk("foo %s %d %s %s (%s)", __entry->foo, __entry->bar, + TP_printk("foo %s %d %s %s %s %s (%s)", __entry->foo, __entry->bar, + +/* + * Notice here the use of some helper functions. This includes: + * + * __print_symbolic( variable, { value, "string" }, ... ), + * + * The variable is tested against each value of the { } pair. If + * the variable matches one of the values, then it will print the + * string in that pair. If non are matched, it returns a string + * version of the number (if __entry->bar == 7 then "7" is returned). + */ + __print_symbolic(__entry->bar, + { 0, "zero" }, + { TRACE_SAMPLE_FOO, "TWO" }, + { TRACE_SAMPLE_BAR, "FOUR" }, + { TRACE_SAMPLE_ZOO, "EIGHT" }, + { 10, "TEN" } + ), + +/* + * __print_flags( variable, "delim", { value, "flag" }, ... ), + * + * This is similar to __print_symbolic, except that it tests the bits + * of the value. If ((FLAG & variable) == FLAG) then the string is + * printed. If more than one flag matches, then each one that does is + * also printed with delim in between them. + * If not all bits are accounted for, then the not found bits will be + * added in hex format: 0x506 will show BIT2|BIT4|0x500 + */ + __print_flags(__entry->bar, "|", + { 1, "BIT1" }, + { 2, "BIT2" }, + { 4, "BIT3" }, + { 8, "BIT4" } + ), +/* + * __print_array( array, len, element_size ) + * + * This prints out the array that is defined by __array in a nice format. + */ __print_array(__get_dynamic_array(list), __get_dynamic_array_len(list), sizeof(int)), |
