1 // SPDX-License-Identifier: GPL-2.0 2 /* Copyright (c) 2021 Facebook */ 3 4 #include "vmlinux.h" 5 #include <bpf/bpf_helpers.h> 6 #include <bpf/bpf_tracing.h> 7 #include "bpf_misc.h" 8 9 char _license[] SEC("license") = "GPL"; 10 11 int null_data_vprintk_ret = 0; 12 int trace_vprintk_ret = 0; 13 int trace_vprintk_ran = 0; 14 15 SEC("fentry/" SYS_PREFIX "sys_nanosleep") 16 int sys_enter(void *ctx) 17 { 18 static const char one[] = "1"; 19 static const char three[] = "3"; 20 static const char five[] = "5"; 21 static const char seven[] = "7"; 22 static const char nine[] = "9"; 23 static const char f[] = "%pS\n"; 24 25 /* runner doesn't search for \t, just ensure it compiles */ 26 bpf_printk("\t"); 27 28 trace_vprintk_ret = __bpf_vprintk("%s,%d,%s,%d,%s,%d,%s,%d,%s,%d %d\n", 29 one, 2, three, 4, five, 6, seven, 8, nine, 10, ++trace_vprintk_ran); 30 31 /* non-NULL fmt w/ NULL data should result in error */ 32 null_data_vprintk_ret = bpf_trace_vprintk(f, sizeof(f), NULL, 0); 33 return 0; 34 } 35