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Migrate to POSIX signals. (#190)

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This removes SYSVSIGNALS as we're always and only using POSIX
signals now.

Some platform differences have been papered over. We used to
only ignore SIGPIPE when using BSD signals, but we now ignore
it all the time.

While the SIGFPE code will now compile, it hasn't been updated
to work on modern OSes fully yet as it will need to enable
the correct FP exceptions.
This commit is contained in:
Bruce Mitchener
2021-01-09 11:55:39 +07:00
committed by GitHub
parent c83b4879ab
commit 2dcdf14334
20 changed files with 161 additions and 293 deletions
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21
src/unixfork.c
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@@ -203,6 +203,7 @@ int fork_Unix() {
UnixToLisp[2], /* Outgoing pipe to LISP */
UnixPID, LispPipeIn, LispPipeOut, slot;
pid_t pid;
sigset_t signals;
char IOBuf[4];
unsigned short tmp;
@@ -221,18 +222,14 @@ int fork_Unix() {
StartTime = time(0); /* Save the time, to create filenames with */
StartTime &= 0xFFFFFF; /* as a positive number! */
/* interrupts need to be blocked here so subprocess won't see them */
#ifdef SYSVSIGNALS
sighold(SIGVTALRM);
sighold(SIGIO);
sighold(SIGALRM);
sighold(SIGXFSZ);
sighold(SIGFPE);
#else
sigblock(sigmask(SIGVTALRM) | sigmask(SIGIO) | sigmask(SIGALRM)
| sigmask(SIGXFSZ)
| sigmask(SIGFPE));
#endif /* SYSVSIGNALS */
/* interrupts need to be blocked here so subprocess won't see them */
sigemptyset(&signals);
sigaddset(&signals, SIGVTALRM);
sigaddset(&signals, SIGIO);
sigaddset(&signals, SIGALRM);
sigaddset(&signals, SIGXFSZ);
sigaddset(&signals, SIGFPE);
sigprocmask(SIG_BLOCK, &signals, NULL);
if ((UnixPID = fork()) == -1) { /* Fork off small version of the emulator */
perror("fork");