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 TRACEFS_PIPE "/sys/kernel/tracing/trace_pipe" 9 #define DEBUGFS_PIPE "/sys/kernel/debug/tracing/trace_pipe" 10 #define SEARCHMSG "1,2,3,4,5,6,7,8,9,10" 11 12 void serial_test_trace_vprintk(void) 13 { 14 struct trace_vprintk_lskel__bss *bss; 15 int err = 0, iter = 0, found = 0; 16 struct trace_vprintk_lskel *skel; 17 char *buf = NULL; 18 FILE *fp = NULL; 19 size_t buflen; 20 21 skel = trace_vprintk_lskel__open_and_load(); 22 if (!ASSERT_OK_PTR(skel, "trace_vprintk__open_and_load")) 23 goto cleanup; 24 25 bss = skel->bss; 26 27 err = trace_vprintk_lskel__attach(skel); 28 if (!ASSERT_OK(err, "trace_vprintk__attach")) 29 goto cleanup; 30 31 if (access(TRACEFS_PIPE, F_OK) == 0) 32 fp = fopen(TRACEFS_PIPE, "r"); 33 else 34 fp = fopen(DEBUGFS_PIPE, "r"); 35 if (!ASSERT_OK_PTR(fp, "fopen(TRACE_PIPE)")) 36 goto cleanup; 37 38 /* We do not want to wait forever if this test fails... */ 39 fcntl(fileno(fp), F_SETFL, O_NONBLOCK); 40 41 /* wait for tracepoint to trigger */ 42 usleep(1); 43 trace_vprintk_lskel__detach(skel); 44 45 if (!ASSERT_GT(bss->trace_vprintk_ran, 0, "bss->trace_vprintk_ran")) 46 goto cleanup; 47 48 if (!ASSERT_GT(bss->trace_vprintk_ret, 0, "bss->trace_vprintk_ret")) 49 goto cleanup; 50 51 /* verify our search string is in the trace buffer */ 52 while (getline(&buf, &buflen, fp) >= 0 || errno == EAGAIN) { 53 if (strstr(buf, SEARCHMSG) != NULL) 54 found++; 55 if (found == bss->trace_vprintk_ran) 56 break; 57 if (++iter > 1000) 58 break; 59 } 60 61 if (!ASSERT_EQ(found, bss->trace_vprintk_ran, "found")) 62 goto cleanup; 63 64 if (!ASSERT_LT(bss->null_data_vprintk_ret, 0, "bss->null_data_vprintk_ret")) 65 goto cleanup; 66 67 cleanup: 68 trace_vprintk_lskel__destroy(skel); 69 free(buf); 70 if (fp) 71 fclose(fp); 72 } 73