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d790ead8a6
In is_valid_tracepoint, rather than scanning "/sys/kernel/tracing/events/*/*" skipping any path where "/sys/kernel/tracing/events/*/*/id" doesn't exist, and then testing if "*:*" matches the tracepoint name, just use the given tracepoint name replace the ':' with '/' and see if the id file exists. This turns a nested directory search into a single file available test. Rather than return 1 for valid and 0 for invalid, return true and false. Signed-off-by: Ian Rogers <irogers@google.com> Cc: Adrian Hunter <adrian.hunter@intel.com> Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com> Cc: Ingo Molnar <mingo@redhat.com> Cc: Jiri Olsa <jolsa@kernel.org> Cc: Kan Liang <kan.liang@linux.intel.com> Cc: Mark Rutland <mark.rutland@arm.com> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Peter Zijlstra <peterz@infradead.org> Link: https://lore.kernel.org/r/20240509153245.1990426-1-irogers@google.com Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
53 lines
1.1 KiB
C
53 lines
1.1 KiB
C
// SPDX-License-Identifier: GPL-2.0
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#include "tracepoint.h"
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#include <errno.h>
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#include <fcntl.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <sys/param.h>
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#include <unistd.h>
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#include <api/fs/tracing_path.h>
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#include "fncache.h"
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int tp_event_has_id(const char *dir_path, struct dirent *evt_dir)
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{
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char evt_path[MAXPATHLEN];
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int fd;
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snprintf(evt_path, MAXPATHLEN, "%s/%s/id", dir_path, evt_dir->d_name);
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fd = open(evt_path, O_RDONLY);
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if (fd < 0)
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return -EINVAL;
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close(fd);
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return 0;
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}
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/*
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* Check whether event is in <debugfs_mount_point>/tracing/events
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*/
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bool is_valid_tracepoint(const char *event_string)
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{
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char *dst, *path = malloc(strlen(event_string) + 4); /* Space for "/id\0". */
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bool have_file = false; /* Conservatively return false if memory allocation failed. */
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const char *src;
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if (!path)
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return false;
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/* Copy event_string replacing the ':' with '/'. */
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for (src = event_string, dst = path; *src; src++, dst++)
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*dst = (*src == ':') ? '/' : *src;
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/* Add "/id\0". */
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memcpy(dst, "/id", 4);
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dst = get_events_file(path);
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if (dst)
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have_file = file_available(dst);
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free(dst);
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free(path);
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return have_file;
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}
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