73 lines
1.7 KiB
C
73 lines
1.7 KiB
C
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// 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 TRACEBUF "/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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fp = fopen(TRACEBUF, "r");
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if (!ASSERT_OK_PTR(fp, "fopen(TRACEBUF)"))
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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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