// SPDX-License-Identifier: GPL-2.0 /* Copyright (c) 2021 Facebook */ #include <test_progs.h> #include "trace_vprintk.lskel.h" #define TRACEBUF "/sys/kernel/debug/tracing/trace_pipe" #define SEARCHMSG "1,2,3,4,5,6,7,8,9,10" void serial_test_trace_vprintk(void) { struct trace_vprintk_lskel__bss *bss; int err = 0, iter = 0, found = 0; struct trace_vprintk_lskel *skel; char *buf = NULL; FILE *fp = NULL; size_t buflen; skel = trace_vprintk_lskel__open_and_load(); if (!ASSERT_OK_PTR(skel, "trace_vprintk__open_and_load")) goto cleanup; bss = skel->bss; err = trace_vprintk_lskel__attach(skel); if (!ASSERT_OK(err, "trace_vprintk__attach")) goto cleanup; fp = fopen(TRACEBUF, "r"); if (!ASSERT_OK_PTR(fp, "fopen(TRACEBUF)")) goto cleanup; /* We do not want to wait forever if this test fails... */ fcntl(fileno(fp), F_SETFL, O_NONBLOCK); /* wait for tracepoint to trigger */ usleep(1); trace_vprintk_lskel__detach(skel); if (!ASSERT_GT(bss->trace_vprintk_ran, 0, "bss->trace_vprintk_ran")) goto cleanup; if (!ASSERT_GT(bss->trace_vprintk_ret, 0, "bss->trace_vprintk_ret")) goto cleanup; /* verify our search string is in the trace buffer */ while (getline(&buf, &buflen, fp) >= 0 || errno == EAGAIN) { if (strstr(buf, SEARCHMSG) != NULL) found++; if (found == bss->trace_vprintk_ran) break; if (++iter > 1000) break; } if (!ASSERT_EQ(found, bss->trace_vprintk_ran, "found")) goto cleanup; if (!ASSERT_LT(bss->null_data_vprintk_ret, 0, "bss->null_data_vprintk_ret")) goto cleanup; cleanup: trace_vprintk_lskel__destroy(skel); free(buf); if (fp) fclose(fp); }