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Improve cancellations, randomness, and time

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- Exhaustively document cancellation points
- Rename SIGCANCEL to SIGTHR just like BSDs
- Further improve POSIX thread cancellations
- Ensure asynchronous cancellations work correctly
- Elevate the quality of getrandom() and getentropy()
- Make futexes cancel correctly on OpenBSD 6.x and 7.x
- Add reboot.com and shutdown.com to examples directory
- Remove underscore prefix from awesome timespec_*() APIs
- Create assertions that help verify our cancellation points
- Remove bad timespec APIs (cmp generalizes eq/ne/gt/gte/lt/lte)
This commit is contained in:
Justine Tunney 2022-11-05 19:49:41 -07:00
parent 0d7c265392
commit 3f0bcdc3ef
No known key found for this signature in database
GPG key ID: BE714B4575D6E328
173 changed files with 1599 additions and 782 deletions
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20
tool/build/lib/syscall.c
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@ -259,6 +259,7 @@ static int64_t OpMmap(struct Machine *m, int64_t virt, size_t size, int prot,
void *tmp;
ssize_t rc;
uint64_t key;
bool recoverable;
VERBOSEF("MMAP%s %012lx %,ld %#x %#x %d %#lx", GetSimulated(), virt, size,
prot, flags, fd, offset);
if (prot & PROT_READ) {
@ -268,7 +269,10 @@ static int64_t OpMmap(struct Machine *m, int64_t virt, size_t size, int prot,
if (flags & 256 /* MAP_GROWSDOWN */) key |= PAGE_GROD;
flags = XlatMapFlags(flags);
if (fd != -1 && (fd = GetFd(m, fd)) == -1) return -1;
if (!(flags & MAP_FIXED)) {
if (flags & MAP_FIXED) {
recoverable = false;
} else {
recoverable = true;
if (!virt) {
if ((virt = FindVirtual(m, m->brk, size)) == -1) return -1;
m->brk = virt + size;
@ -278,7 +282,7 @@ static int64_t OpMmap(struct Machine *m, int64_t virt, size_t size, int prot,
}
if (ReserveVirtual(m, virt, size, key) != -1) {
if (fd != -1 && !(flags & MAP_ANONYMOUS)) {
/* TODO: lazy file mappings */
// TODO: lazy file mappings
CHECK_NOTNULL((tmp = malloc(size)));
for (e = errno;;) {
rc = pread(fd, tmp, size, offset);
@ -290,11 +294,13 @@ static int64_t OpMmap(struct Machine *m, int64_t virt, size_t size, int prot,
VirtualRecvWrite(m, virt, tmp, size);
free(tmp);
}
} else {
return virt;
} else if (recoverable) {
FreeVirtual(m, virt, size);
return -1;
} else {
FATALF("unrecoverable oom with mmap(MAP_FIXED)");
}
return virt;
} else {
return FreeVirtual(m, virt, size);
}
@ -1137,7 +1143,7 @@ static int OpPoll(struct Machine *m, int64_t fdsaddr, uint64_t nfds,
if ((gfds = malloc(gfdssize))) {
rc = 0;
VirtualSendRead(m, gfds, fdsaddr, gfdssize);
ts1 = _timespec_mono();
ts1 = timespec_mono();
for (;;) {
for (i = 0; i < nfds; ++i) {
fd = Read32(gfds[i].fd);
@ -1183,8 +1189,8 @@ static int OpPoll(struct Machine *m, int64_t fdsaddr, uint64_t nfds,
goto Finished;
}
} else {
ts2 = _timespec_mono();
elapsed = _timespec_tomicros(_timespec_sub(ts2, ts1));
ts2 = timespec_mono();
elapsed = timespec_tomicros(timespec_sub(ts2, ts1));
if (elapsed >= timeout) {
break;
}