1 // SPDX-License-Identifier: GPL-2.0 2 /* Copyright (c) 2021 Facebook */ 3 4 #include <test_progs.h> 5 6 #include "trace_vprintk.lskel.h" 7 8 #define TRACEBUF "/sys/kernel/debug/tracing/trace_pipe" 9 #define SEARCHMSG "1,2,3,4,5,6,7,8,9,10" 10 11 void serial_test_trace_vprintk(void) 12 { 13 struct trace_vprintk_lskel__bss *bss; 14 int err = 0, iter = 0, found = 0; 15 struct trace_vprintk_lskel *skel; 16 char *buf = NULL; 17 FILE *fp = NULL; 18 size_t buflen; 19 20 skel = trace_vprintk_lskel__open_and_load(); 21 if (!ASSERT_OK_PTR(skel, "trace_vprintk__open_and_load")) 22 goto cleanup; 23 24 bss = skel->bss; 25 26 err = trace_vprintk_lskel__attach(skel); 27 if (!ASSERT_OK(err, "trace_vprintk__attach")) 28 goto cleanup; 29 30 fp = fopen(TRACEBUF, "r"); 31 if (!ASSERT_OK_PTR(fp, "fopen(TRACEBUF)")) 32 goto cleanup; 33 34 /* We do not want to wait forever if this test fails... */ 35 fcntl(fileno(fp), F_SETFL, O_NONBLOCK); 36 37 /* wait for tracepoint to trigger */ 38 usleep(1); 39 trace_vprintk_lskel__detach(skel); 40 41 if (!ASSERT_GT(bss->trace_vprintk_ran, 0, "bss->trace_vprintk_ran")) 42 goto cleanup; 43 44 if (!ASSERT_GT(bss->trace_vprintk_ret, 0, "bss->trace_vprintk_ret")) 45 goto cleanup; 46 47 /* verify our search string is in the trace buffer */ 48 while (getline(&buf, &buflen, fp) >= 0 || errno == EAGAIN) { 49 if (strstr(buf, SEARCHMSG) != NULL) 50 found++; 51 if (found == bss->trace_vprintk_ran) 52 break; 53 if (++iter > 1000) 54 break; 55 } 56 57 if (!ASSERT_EQ(found, bss->trace_vprintk_ran, "found")) 58 goto cleanup; 59 60 if (!ASSERT_LT(bss->null_data_vprintk_ret, 0, "bss->null_data_vprintk_ret")) 61 goto cleanup; 62 63 cleanup: 64 trace_vprintk_lskel__destroy(skel); 65 free(buf); 66 if (fp) 67 fclose(fp); 68 } 69