test: cover sigtest
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#include "ulib.h"
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/*
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* Boot-time driver for the whole signal-delivery demo (signal.h). Spawns
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* two independent children -- sigtarget.c (installs a real handler) and
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* sigdefault.c (installs none) -- and sends each a real signal through the
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* full syscall path (userSigSend, not a kernel-internal shortcut), proving
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* both outcomes sigConsumePending can produce: caught-and-resumed, and
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* uncaught-and-terminated.
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*
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* sigtarget needs a real happens-before guarantee, not a sleep guess:
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* sigUsr1's default disposition is Terminate, so a signal that arrives
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* before sigtarget's userSigAction has actually run would kill it instead
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* of being caught -- this was originally "give it 100ms and hope", which
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* really did fail under host load (sigtarget killed by the uncaught
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* default before it ever installed its handler). See sigtarget.c for the
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* shared-pipe rendezvous (fifomaster.c's pattern) that fixes it: this
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* process blocks on a real read for sigtarget's own "handler installed"
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* byte before ever calling userSigSend.
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*
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* sigdefault has no such window -- its default disposition applies from
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* the moment it exists, whether or not it has run any code yet -- so a
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* plain sleep-then-send (mirroring killtest.c's own "give the victim time
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* to reach its blocking read") is genuinely sufficient there.
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*/
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int main(void)
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{
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print("sigtest: start, pid=");
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printDec(userGetpid());
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print("\n");
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if (userSigSend(999999, sigUsr1) != -1) {
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print("sigtest: FAIL signal to bogus pid should fail\n");
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return 1;
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}
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print("sigtest: signal to bad pid rejected\n");
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if (userSigAction(sigKill, (SigHandler)0, 0, 0) != (long)sigSetFailed) {
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print("sigtest: FAIL installing a sigKill handler should be rejected\n");
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return 1;
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}
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print("sigtest: sigkill-handler-rejected-ok\n");
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long readyHandle = userPipeCreate();
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if (readyHandle < 0) {
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print("sigtest: FAIL create ready pipe\n");
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return 1;
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}
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/* Attach as reader BEFORE sigtarget even exists, let alone before it
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can possibly attach+write+close its own end: pipeCloseWrite (pipe.c)
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reclaims a detached pipe's slot the moment readers AND writers both
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read 0, which they still would right after sigtarget's write+close
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if this process had not attached yet -- observed for real (sigtarget
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raced ahead, wrote its ready byte, closed, and freed the slot before
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this process's own attach below ever ran, which then failed outright
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on the now-invalid handle). Attaching first makes readers==1 from
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the very start, so that race window never opens. */
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long readyFd = userPipeAttach(readyHandle, 0);
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if (readyFd < 0) {
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print("sigtest: FAIL attach ready pipe\n");
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return 1;
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}
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char readyHandleStr[24];
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decToString(readyHandle, readyHandleStr);
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char* targetArgv[] = { "/bin/sigtarget", readyHandleStr, 0 };
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long target = userSpawn("/bin/sigtarget", targetArgv);
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if (target < 0) {
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print("sigtest: FAIL spawn sigtarget\n");
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return 1;
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}
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char readyByte;
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/* Real blocking read: does not return until sigtarget has actually
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installed its handler and written this byte (see sigtarget.c) --
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the happens-before guarantee a fixed userSleep could not give. */
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if (userRead((int)readyFd, &readyByte, 1) != 1) {
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print("sigtest: FAIL read ready byte\n");
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return 1;
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}
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userClose((int)readyFd);
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if (userSigSend(target, sigUsr1) != 0) {
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print("sigtest: FAIL send sigUsr1 to sigtarget\n");
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return 1;
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}
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print("sigtest: sent sigUsr1 to sigtarget\n");
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long status = userWait(target);
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print("sigtest: sigtarget exit status=");
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printDec(status);
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print("\n");
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if (status != 42) {
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print("sigtest: FAIL expected sigtarget exit status 42\n");
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return 1;
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}
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print("sigtest: handler-roundtrip-ok\n");
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long defaultTarget = userSpawn("/bin/sigdefault", 0);
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if (defaultTarget < 0) {
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print("sigtest: FAIL spawn sigdefault\n");
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return 1;
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}
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userSleep(100);
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if (userSigSend(defaultTarget, sigTerm) != 0) {
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print("sigtest: FAIL send sigTerm to sigdefault\n");
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return 1;
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}
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print("sigtest: sent sigTerm to sigdefault\n");
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long defaultStatus = userWait(defaultTarget);
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print("sigtest: sigdefault exit status=");
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printDec(defaultStatus);
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print("\n");
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if (defaultStatus != 128 + sigTerm) {
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print("sigtest: FAIL expected sigdefault exit status 128+sigTerm\n");
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return 1;
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}
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print("sigtest: default-terminate-ok\n");
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return 0;
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}
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