tools/lib/api/fs/tracing_path.c

File Facts

System

Linux kernel

Corpus path

tools/lib/api/fs/tracing_path.c

Extension

.c

Size

3598 bytes

Lines

179

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.

• Repository support layer: documentation, build tooling, samples, user-space helper tools, generated initramfs support, licenses, and validation utilities.
• Defines or uses C structs; map object ownership, embedded links, reference counts, and lock ownership.

Dependency Surface

• stdio.h
• stdlib.h
• string.h
• linux/string.h
• errno.h
• unistd.h
• fs.h
• tracing_path.h

Detected Declarations

• function __tracing_path_set
• function tracing_path_set
• function put_tracing_file
• function put_events_file
• function tracing_events__scandir_alphasort
• function tracing_path__strerror_open_tp

Annotated Snippet

if (debugfs__configured() || tracefs__configured()) {
			/* sdt markers */
			if (!strncmp(filename, "sdt_", 4)) {
				snprintf(buf, size,
					"Error:\tFile %s/events/%s not found.\n"
					"Hint:\tSDT event cannot be directly recorded on.\n"
					"\tPlease first use 'perf probe %s:%s' before recording it.\n",
					tracing_path, filename, sys, name);
			} else {
				snprintf(buf, size,
					 "Error:\tFile %s/events/%s not found.\n"
					 "Hint:\tPerhaps this kernel misses some CONFIG_ setting to enable this feature?.\n",
					 tracing_path, filename);
			}
			break;
		}
		snprintf(buf, size, "%s",
			 "Error:\tUnable to find debugfs/tracefs\n"
			 "Hint:\tWas your kernel compiled with debugfs/tracefs support?\n"
			 "Hint:\tIs the debugfs/tracefs filesystem mounted?\n"
			 "Hint:\tTry 'sudo mount -t debugfs nodev /sys/kernel/debug'");
		break;
	case EACCES: {
		snprintf(buf, size,
			 "Error:\tNo permissions to read %s/events/%s\n"
			 "Hint:\tTry 'sudo mount -o remount,mode=755 %s'\n",
			 tracing_path, filename, tracing_path_mount());
	}
		break;
	default:
		snprintf(buf, size, "%s", str_error_r(err, sbuf, sizeof(sbuf)));
		break;
	}

	return 0;
}

Annotation

• Immediate include surface: `stdio.h`, `stdlib.h`, `string.h`, `linux/string.h`, `errno.h`, `unistd.h`, `fs.h`, `tracing_path.h`.
• Detected declarations: `function __tracing_path_set`, `function tracing_path_set`, `function put_tracing_file`, `function put_events_file`, `function tracing_events__scandir_alphasort`, `function tracing_path__strerror_open_tp`.
• Atlas domain: Support Tooling And Documentation / tools.
• Implementation status: source implementation candidate.

Implementation Notes

• This generated page is the file-by-file coverage layer; curated subsystem chapters should link here when they synthesize a multi-file control flow.
• Core OS pages should be promoted from atlas-only to deep-reviewed when they explain data structures, invariants, locking, lifecycle, and C implementation snippets.
• Driver-family pages are intentionally pattern-oriented unless they are part of the selected PCIe/NVMe representative device path.