ab4c15feb2
The canonical location for the tracefs filesystem is at /sys/kernel/tracing. But, from Documentation/trace/ftrace.rst: Before 4.1, all ftrace tracing control files were within the debugfs file system, which is typically located at /sys/kernel/debug/tracing. For backward compatibility, when mounting the debugfs file system, the tracefs file system will be automatically mounted at: /sys/kernel/debug/tracing Many tests in the bpf selftest code still refer to this older debugfs path, so let's update them to avoid confusion. Signed-off-by: Ross Zwisler <zwisler@google.com> Acked-by: Michael S. Tsirkin <mst@redhat.com> Reviewed-by: Steven Rostedt (Google) <rostedt@goodmis.org> Link: https://lore.kernel.org/r/20230313205628.1058720-3-zwisler@kernel.org Signed-off-by: Alexei Starovoitov <ast@kernel.org>
76 lines
1.8 KiB
C
76 lines
1.8 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/* Copyright (c) 2020, Oracle and/or its affiliates. */
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#include <test_progs.h>
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#include "trace_printk.lskel.h"
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#define TRACEFS_PIPE "/sys/kernel/tracing/trace_pipe"
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#define DEBUGFS_PIPE "/sys/kernel/debug/tracing/trace_pipe"
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#define SEARCHMSG "testing,testing"
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void serial_test_trace_printk(void)
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{
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struct trace_printk_lskel__bss *bss;
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int err = 0, iter = 0, found = 0;
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struct trace_printk_lskel *skel;
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char *buf = NULL;
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FILE *fp = NULL;
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size_t buflen;
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skel = trace_printk_lskel__open();
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if (!ASSERT_OK_PTR(skel, "trace_printk__open"))
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return;
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ASSERT_EQ(skel->rodata->fmt[0], 'T', "skel->rodata->fmt[0]");
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skel->rodata->fmt[0] = 't';
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err = trace_printk_lskel__load(skel);
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if (!ASSERT_OK(err, "trace_printk__load"))
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goto cleanup;
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bss = skel->bss;
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err = trace_printk_lskel__attach(skel);
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if (!ASSERT_OK(err, "trace_printk__attach"))
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goto cleanup;
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if (access(TRACEFS_PIPE, F_OK) == 0)
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fp = fopen(TRACEFS_PIPE, "r");
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else
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fp = fopen(DEBUGFS_PIPE, "r");
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if (!ASSERT_OK_PTR(fp, "fopen(TRACE_PIPE)"))
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goto cleanup;
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/* We do not want to wait forever if this test fails... */
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fcntl(fileno(fp), F_SETFL, O_NONBLOCK);
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/* wait for tracepoint to trigger */
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usleep(1);
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trace_printk_lskel__detach(skel);
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if (!ASSERT_GT(bss->trace_printk_ran, 0, "bss->trace_printk_ran"))
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goto cleanup;
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if (!ASSERT_GT(bss->trace_printk_ret, 0, "bss->trace_printk_ret"))
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goto cleanup;
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/* verify our search string is in the trace buffer */
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while (getline(&buf, &buflen, fp) >= 0 || errno == EAGAIN) {
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if (strstr(buf, SEARCHMSG) != NULL)
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found++;
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if (found == bss->trace_printk_ran)
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break;
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if (++iter > 1000)
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break;
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}
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if (!ASSERT_EQ(found, bss->trace_printk_ran, "found"))
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goto cleanup;
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cleanup:
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trace_printk_lskel__destroy(skel);
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free(buf);
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if (fp)
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fclose(fp);
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}
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