tools/counter/counter_example.c

Source file repositories/reference/linux-study-clean/tools/counter/counter_example.c

File Facts

System
Linux kernel
Corpus path
tools/counter/counter_example.c
Extension
.c
Size
2215 bytes
Lines
93
Domain
Support Tooling And Documentation
Bucket
tools
Inferred role
Support Tooling And Documentation: implementation source
Status
source implementation candidate

Why This File Exists

Repository support layer: documentation, build tooling, samples, user-space helper tools, generated initramfs support, licenses, and validation utilities.

Dependency Surface

Detected Declarations

Annotated Snippet

if (ret == -1) {
			fprintf(stderr, "Error adding watches[%d]: %s\n", i,
				strerror(errno));
			return 1;
		}
	}
	ret = ioctl(fd, COUNTER_ENABLE_EVENTS_IOCTL);
	if (ret == -1) {
		perror("Error enabling events");
		return 1;
	}

	for (;;) {
		ret = read(fd, event_data, sizeof(event_data));
		if (ret == -1) {
			perror("Failed to read event data");
			return 1;
		}

		if (ret != sizeof(event_data)) {
			fprintf(stderr, "Failed to read event data\n");
			return -EIO;
		}

		printf("Timestamp 0: %llu\tCount 0: %llu\n"
		       "Error Message 0: %s\n"
		       "Timestamp 1: %llu\tCount 1: %llu\n"
		       "Error Message 1: %s\n",
		       event_data[0].timestamp, event_data[0].value,
		       strerror(event_data[0].status),
		       event_data[1].timestamp, event_data[1].value,
		       strerror(event_data[1].status));
	}

	return 0;
}

Annotation

Implementation Notes