bpf/prog_tests/trace_vprintk.c

0001 // SPDX-License-Identifier: GPL-2.0
0002 /* Copyright (c) 2021 Facebook */
0003
0004 #include <test_progs.h>
0005
0006 #include "trace_vprintk.lskel.h"
0007
0008 #define TRACEBUF    "/sys/kernel/debug/tracing/trace_pipe"
0009 #define SEARCHMSG   "1,2,3,4,5,6,7,8,9,10"
0010
0011 void serial_test_trace_vprintk(void)
0012 {
0013     struct trace_vprintk_lskel__bss *bss;
0014     int err = 0, iter = 0, found = 0;
0015     struct trace_vprintk_lskel *skel;
0016     char *buf = NULL;
0017     FILE *fp = NULL;
0018     size_t buflen;
0019
0020     skel = trace_vprintk_lskel__open_and_load();
0021     if (!ASSERT_OK_PTR(skel, "trace_vprintk__open_and_load"))
0022         goto cleanup;
0023
0024     bss = skel->bss;
0025
0026     err = trace_vprintk_lskel__attach(skel);
0027     if (!ASSERT_OK(err, "trace_vprintk__attach"))
0028         goto cleanup;
0029
0030     fp = fopen(TRACEBUF, "r");
0031     if (!ASSERT_OK_PTR(fp, "fopen(TRACEBUF)"))
0032         goto cleanup;
0033
0034     /* We do not want to wait forever if this test fails... */
0035     fcntl(fileno(fp), F_SETFL, O_NONBLOCK);
0036
0037     /* wait for tracepoint to trigger */
0038     usleep(1);
0039     trace_vprintk_lskel__detach(skel);
0040
0041     if (!ASSERT_GT(bss->trace_vprintk_ran, 0, "bss->trace_vprintk_ran"))
0042         goto cleanup;
0043
0044     if (!ASSERT_GT(bss->trace_vprintk_ret, 0, "bss->trace_vprintk_ret"))
0045         goto cleanup;
0046
0047     /* verify our search string is in the trace buffer */
0048     while (getline(&buf, &buflen, fp) >= 0 || errno == EAGAIN) {
0049         if (strstr(buf, SEARCHMSG) != NULL)
0050             found++;
0051         if (found == bss->trace_vprintk_ran)
0052             break;
0053         if (++iter > 1000)
0054             break;
0055     }
0056
0057     if (!ASSERT_EQ(found, bss->trace_vprintk_ran, "found"))
0058         goto cleanup;
0059
0060     if (!ASSERT_LT(bss->null_data_vprintk_ret, 0, "bss->null_data_vprintk_ret"))
0061         goto cleanup;
0062
0063 cleanup:
0064     trace_vprintk_lskel__destroy(skel);
0065     free(buf);
0066     if (fp)
0067         fclose(fp);
0068 }