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test_signals.c
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/*
* Copyright 2020 New Relic Corporation. All rights reserved.
* SPDX-License-Identifier: Apache-2.0
*/
#include "nr_axiom.h"
#include <sys/stat.h>
#include <sys/types.h>
#include <fcntl.h>
#include <limits.h>
#include <setjmp.h>
#include <signal.h>
#include <unistd.h>
#ifdef HAVE_BACKTRACE
#include <execinfo.h>
#endif
#include "util_logging.h"
#include "util_memory.h"
#include "util_signals.h"
#include "util_syscalls.h"
#include "tlib_main.h"
typedef void (*nr_signaller_t)(int signaller_arg);
static void nr_test_signals_do_kill(nr_signaller_t signaller,
int signaller_arg) {
if (0 != signaller) {
signaller(signaller_arg);
}
}
static const char* signal_name(int sig);
/*
* Test the handlers for segmentation violation.
*
* Since we can't recover from a segmentation violation in a portable
* manner, we use a SIGUSR1 instead, and assume that sending and receipt
* of SIGUSR1 from our process back to ourselves is synchronous.
*/
/*
* WATCH OUT! It is tempting to call nrl_error or other logging
* functions from these signal handler functions, but those functions
* may call malloc, which is not allowed in signal handlers. The thread
* sanitizer discovers this, and will complain about it.
*/
static void sigsegv_signal_tracer(int sig) {
nr_signal_tracer_common(sig);
}
#if defined(TEST_DODGY_SIGNALS) /* { */
static void sigfpe_signal_tracer(int sig) {
nr_signal_tracer_common(sig);
}
static jmp_buf sigfpe_real_signal_tracer_jmp_buf;
static void sigfpe_real_signal_tracer(int sig) {
nr_signal_tracer_common(sig);
longjmp(sigfpe_real_signal_tracer_jmp_buf, 1);
}
#endif /* } */
static void send_signal(int signal_to_send) {
kill(nr_getpid(),
signal_to_send); /* assumes synchronous send and receive to self */
}
#if defined(TEST_DODGY_SIGNALS) /* { */
static int nr_test_signals_zero(void) {
return 0;
}
static void do_integer_zero_divide(int arg NRUNUSED) {
int x = 0;
nrl_send_log_message(NRL_ALWAYS, "before integer zero divide x=%d", x);
(void)x;
x = 1 / nr_test_signals_zero();
nrl_send_log_message(NRL_ALWAYS, "after integer zero divide x=%d", x);
}
static void do_integer_corner_divide(int arg NRUNUSED) {
int x = 0;
(void)x;
nrl_send_log_message(NRL_ALWAYS, "before integer INT_MIN / -1 divide x=%d",
x);
x = INT_MIN
/ (nr_test_signals_zero()
- 1); /* eg, INT_MIN / -1 , which isn't representable */
nrl_send_log_message(NRL_ALWAYS, "after integer INT_MIN / -1 divide x=%d",
x);
}
#endif /* } */
/*
* Execute backtrace and related just for the side effect
* of loading the DSO that does that, so that we don't call
* malloc from a signal handler.
*/
static void test_signals_prime_backtrace(void) {
#ifdef HAVE_BACKTRACE
void* array[100];
size_t size;
int fd;
size = backtrace(array, sizeof(array) / sizeof(array[0]));
fd = nr_open("/dev/null", 0, 0666);
backtrace_symbols_fd(array, size, fd);
nr_close(fd);
fd = -1;
#endif
}
static const char* signal_name(int sig) {
switch (sig) {
#ifdef SIGHUP
case SIGHUP:
return "SIGHUP";
#endif
#ifdef SIGINT
case SIGINT:
return "SIGINT";
#endif
#ifdef SIGQUIT
case SIGQUIT:
return "SIGQUIT";
#endif
#ifdef SIGILL
case SIGILL:
return "SIGILL";
#endif
#ifdef SIGTRAP
case SIGTRAP:
return "SIGTRAP";
#endif
#ifdef SIGABRT
case SIGABRT:
return "SIGABRT";
#endif
#ifdef SIGEMT
case SIGEMT:
return "SIGEMT";
#endif
#ifdef SIGFPE
case SIGFPE:
return "SIGFPE";
#endif
#ifdef SIGKILL
case SIGKILL:
return "SIGKILL";
#endif
#ifdef SIGBUS
case SIGBUS:
return "SIGBUS";
#endif
#ifdef SIGSEGV
case SIGSEGV:
return "SIGSEGV";
#endif
#ifdef SIGSYS
case SIGSYS:
return "SIGSYS";
#endif
#ifdef SIGPIPE
case SIGPIPE:
return "SIGPIPE";
#endif
#ifdef SIGALRM
case SIGALRM:
return "SIGALRM";
#endif
#ifdef SIGTERM
case SIGTERM:
return "SIGTERM";
#endif
#ifdef SIGURG
case SIGURG:
return "SIGURG";
#endif
#ifdef SIGSTOP
case SIGSTOP:
return "SIGSTOP";
#endif
#ifdef SIGTSTP
case SIGTSTP:
return "SIGTSTP";
#endif
#ifdef SIGCONT
case SIGCONT:
return "SIGCONT";
#endif
#ifdef SIGCHLD
case SIGCHLD:
return "SIGCHLD";
#endif
#ifdef SIGTTIN
case SIGTTIN:
return "SIGTTIN";
#endif
#ifdef SIGTTOU
case SIGTTOU:
return "SIGTTOU";
#endif
#ifdef SIGIO
case SIGIO:
return "SIGIO";
#endif
#ifdef SIGXCPU
case SIGXCPU:
return "SIGXCPU";
#endif
#ifdef SIGXFSZ
case SIGXFSZ:
return "SIGXFSZ";
#endif
#ifdef SIGVTALRM
case SIGVTALRM:
return "SIGVTALRM";
#endif
#ifdef SIGPROF
case SIGPROF:
return "SIGPROF";
#endif
#ifdef SIGWINCH
case SIGWINCH:
return "SIGWINCH";
#endif
#ifdef SIGLOST
case SIGLOST:
return "SIGLOST";
#endif
#ifdef SIGUSR1
case SIGUSR1:
return "SIGUSR1";
#endif
#ifdef SIGUSR2
case SIGUSR2:
return "SIGUSR2";
#endif
#ifdef SIGPWR
case SIGPWR:
return "SIGPWR";
#endif
#if defined(__APPLE__)
#ifdef SIGPOLL
case SIGPOLL:
return "SIGPOLL";
#endif
#endif
#ifdef SIGWIND
case SIGWIND:
return "SIGWIND";
#endif
#ifdef SIGPHONE
case SIGPHONE:
return "SIGPHONE";
#endif
#ifdef SIGWAITING
case SIGWAITING:
return "SIGWAITING";
#endif
#ifdef SIGLWP
case SIGLWP:
return "SIGLWP";
#endif
#ifdef SIGDANGER
case SIGDANGER:
return "SIGDANGER";
#endif
#ifdef SIGGRANT
case SIGGRANT:
return "SIGGRANT";
#endif
#ifdef SIGRETRACT
case SIGRETRACT:
return "SIGRETRACT";
#endif
#ifdef SIGMSG
case SIGMSG:
return "SIGMSG";
#endif
#ifdef SIGSOUND
case SIGSOUND:
return "SIGSOUND";
#endif
#ifdef SIGSAK
case SIGSAK:
return "SIGSAK";
#endif
#ifdef SIGPRIO
case SIGPRIO:
return "SIGPRIO";
#endif
#ifdef SIG33
case SIG33:
return "SIG33";
#endif
#ifdef SIG34
case SIG34:
return "SIG34";
#endif
#ifdef SIG35
case SIG35:
return "SIG35";
#endif
#ifdef SIG36
case SIG36:
return "SIG36";
#endif
#ifdef SIG37
case SIG37:
return "SIG37";
#endif
#ifdef SIG38
case SIG38:
return "SIG38";
#endif
#ifdef SIG39
case SIG39:
return "SIG39";
#endif
#ifdef SIG40
case SIG40:
return "SIG40";
#endif
#ifdef SIG41
case SIG41:
return "SIG41";
#endif
#ifdef SIG42
case SIG42:
return "SIG42";
#endif
#ifdef SIG43
case SIG43:
return "SIG43";
#endif
#ifdef SIG44
case SIG44:
return "SIG44";
#endif
#ifdef SIG45
case SIG45:
return "SIG45";
#endif
#ifdef SIG46
case SIG46:
return "SIG46";
#endif
#ifdef SIG47
case SIG47:
return "SIG47";
#endif
#ifdef SIG48
case SIG48:
return "SIG48";
#endif
#ifdef SIG49
case SIG49:
return "SIG49";
#endif
#ifdef SIG50
case SIG50:
return "SIG50";
#endif
#ifdef SIG51
case SIG51:
return "SIG51";
#endif
#ifdef SIG52
case SIG52:
return "SIG52";
#endif
#ifdef SIG53
case SIG53:
return "SIG53";
#endif
#ifdef SIG54
case SIG54:
return "SIG54";
#endif
#ifdef SIG55
case SIG55:
return "SIG55";
#endif
#ifdef SIG56
case SIG56:
return "SIG56";
#endif
#ifdef SIG57
case SIG57:
return "SIG57";
#endif
#ifdef SIG58
case SIG58:
return "SIG58";
#endif
#ifdef SIG59
case SIG59:
return "SIG59";
#endif
#ifdef SIG60
case SIG60:
return "SIG60";
#endif
#ifdef SIG61
case SIG61:
return "SIG61";
#endif
#ifdef SIG62
case SIG62:
return "SIG62";
#endif
#ifdef SIG63
case SIG63:
return "SIG63";
#endif
#ifdef SIGCANCEL
case SIGCANCEL:
return "SIGCANCEL";
#endif
#ifdef SIG32
case SIG32:
return "SIG32";
#endif
#ifdef SIG64
case SIG64:
return "SIG64";
#endif
#ifdef SIG65
case SIG65:
return "SIG65";
#endif
#ifdef SIG66
case SIG66:
return "SIG66";
#endif
#ifdef SIG67
case SIG67:
return "SIG67";
#endif
#ifdef SIG68
case SIG68:
return "SIG68";
#endif
#ifdef SIG69
case SIG69:
return "SIG69";
#endif
#ifdef SIG70
case SIG70:
return "SIG70";
#endif
#ifdef SIG71
case SIG71:
return "SIG71";
#endif
#ifdef SIG72
case SIG72:
return "SIG72";
#endif
#ifdef SIG73
case SIG73:
return "SIG73";
#endif
#ifdef SIG74
case SIG74:
return "SIG74";
#endif
#ifdef SIG75
case SIG75:
return "SIG75";
#endif
#ifdef SIG76
case SIG76:
return "SIG76";
#endif
#ifdef SIG77
case SIG77:
return "SIG77";
#endif
#ifdef SIG78
case SIG78:
return "SIG78";
#endif
#ifdef SIG79
case SIG79:
return "SIG79";
#endif
#ifdef SIG80
case SIG80:
return "SIG80";
#endif
#ifdef SIG81
case SIG81:
return "SIG81";
#endif
#ifdef SIG82
case SIG82:
return "SIG82";
#endif
#ifdef SIG83
case SIG83:
return "SIG83";
#endif
#ifdef SIG84
case SIG84:
return "SIG84";
#endif
#ifdef SIG85
case SIG85:
return "SIG85";
#endif
#ifdef SIG86
case SIG86:
return "SIG86";
#endif
#ifdef SIG87
case SIG87:
return "SIG87";
#endif
#ifdef SIG88
case SIG88:
return "SIG88";
#endif
#ifdef SIG89
case SIG89:
return "SIG89";
#endif
#ifdef SIG90
case SIG90:
return "SIG90";
#endif
#ifdef SIG91
case SIG91:
return "SIG91";
#endif
#ifdef SIG92
case SIG92:
return "SIG92";
#endif
#ifdef SIG93
case SIG93:
return "SIG93";
#endif
#ifdef SIG94
case SIG94:
return "SIG94";
#endif
#ifdef SIG95
case SIG95:
return "SIG95";
#endif
#ifdef SIG96
case SIG96:
return "SIG96";
#endif
#ifdef SIG97
case SIG97:
return "SIG97";
#endif
#ifdef SIG98
case SIG98:
return "SIG98";
#endif
#ifdef SIG99
case SIG99:
return "SIG99";
#endif
#ifdef SIG100
case SIG100:
return "SIG100";
#endif
#ifdef SIG101
case SIG101:
return "SIG101";
#endif
#ifdef SIG102
case SIG102:
return "SIG102";
#endif
#ifdef SIG103
case SIG103:
return "SIG103";
#endif
#ifdef SIG104
case SIG104:
return "SIG104";
#endif
#ifdef SIG105
case SIG105:
return "SIG105";
#endif
#ifdef SIG106
case SIG106:
return "SIG106";
#endif
#ifdef SIG107
case SIG107:
return "SIG107";
#endif
#ifdef SIG108
case SIG108:
return "SIG108";
#endif
#ifdef SIG109
case SIG109:
return "SIG109";
#endif
#ifdef SIG110
case SIG110:
return "SIG110";
#endif
#ifdef SIG111
case SIG111:
return "SIG111";
#endif
#ifdef SIG112
case SIG112:
return "SIG112";
#endif
#ifdef SIG113
case SIG113:
return "SIG113";
#endif
#ifdef SIG114
case SIG114:
return "SIG114";
#endif
#ifdef SIG115
case SIG115:
return "SIG115";
#endif
#ifdef SIG116
case SIG116:
return "SIG116";
#endif
#ifdef SIG117
case SIG117:
return "SIG117";
#endif
#ifdef SIG118
case SIG118:
return "SIG118";
#endif
#ifdef SIG119
case SIG119:
return "SIG119";
#endif
#ifdef SIG120
case SIG120:
return "SIG120";
#endif
#ifdef SIG121
case SIG121:
return "SIG121";
#endif
#ifdef SIG122
case SIG122:
return "SIG122";
#endif
#ifdef SIG123
case SIG123:
return "SIG123";
#endif
#ifdef SIG124
case SIG124:
return "SIG124";
#endif
#ifdef SIG125
case SIG125:
return "SIG125";
#endif
#ifdef SIG126
case SIG126:
return "SIG126";
#endif
#ifdef SIG127
case SIG127:
return "SIG127";
#endif
#ifdef SIGINFO
case SIGINFO:
return "SIGINFO";
#endif
#ifdef EXC_BAD_ACCESS
case EXC_BAD_ACCESS:
return "EXC_BAD_ACCESS";
#endif
#ifdef EXC_BAD_INSTRUCTION
case EXC_BAD_INSTRUCTION:
return "EXC_BAD_INSTRUCTION";
#endif
#ifdef EXC_ARITHMETIC
case EXC_ARITHMETIC:
return "EXC_ARITHMETIC";
#endif
#ifdef EXC_EMULATION
case EXC_EMULATION:
return "EXC_EMULATION";
#endif
#ifdef EXC_SOFTWARE
case EXC_SOFTWARE:
return "EXC_SOFTWARE";
#endif
#ifdef EXC_BREAKPOINT
case EXC_BREAKPOINT:
return "EXC_BREAKPOINT";
#endif
default:
return "?:";
}
}
tlib_parallel_info_t parallel_info
= {.suggested_nthreads = -1, .state_size = 0};
void test_main(void* p NRUNUSED) {
struct sigaction sa;
nr_status_t rv;
const char* actual_output_file_name = "logsignals.tmp";
/*
* Need to ensure we don't start out with existing log files from multiple
* test runs.
*/
nr_unlink(actual_output_file_name);
(void)signal_name(SIGSEGV);
test_signals_prime_backtrace();
rv = nrl_set_log_file(actual_output_file_name);
tlib_pass_if_true("log initialization succeeds", NR_SUCCESS == rv, "rv=%d",
(int)rv);
tlib_pass_if_exists(actual_output_file_name);
rv = nrl_send_log_message(NRL_ALWAYS, "expect PASS 1");
tlib_pass_if_true("NRL_ALWAYS succeeds", NR_SUCCESS == rv, "rv=%d", (int)rv);
nr_memset(&sa, 0, sizeof(sa));
sa.sa_handler = sigsegv_signal_tracer;
sigdelset(&sa.sa_mask, SIGUSR1);
nr_signal_tracer_prep();
sigaction(SIGUSR1, &sa, 0);
nr_test_signals_do_kill(send_signal, SIGUSR1);
tlib_pass_if_true("recovers from receipt of SIGUSR1 (recur 0)", 1, "deref");
sigaction(SIGUSR1, &sa, 0);
nr_test_signals_do_kill(send_signal, SIGUSR1);
tlib_pass_if_true("recovers from receipt of SIGUSR1 (recur 10)", 1, "deref");
sigaction(SIGUSR1, &sa, 0);
nr_test_signals_do_kill(send_signal, SIGUSR1);
tlib_pass_if_true("recovers from receipt of SIGUSR1 (recur 200)", 1, "deref");
nrl_close_log_file();
/*
* Nothing is done with the log file.
* It is too complex, and varies too much
* between runs and across platforms.
*/
}