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Make improvements

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- Improved async signal safety of read() particularly for longjmp()
- Started adding cancel cleanup handlers for locks / etc on Windows
- Make /dev/tty work better particularly for uses like `foo | less`
- Eagerly read console input into a linked list, so poll can signal
- Fix some libc definitional bugs, which configure scripts detected
This commit is contained in:
Justine Tunney 2023-09-21 07:30:39 -07:00
parent d6c2830850
commit 0c5dd7b342
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GPG key ID: BE714B4575D6E328
85 changed files with 1062 additions and 671 deletions
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78
libc/sock/pselect.c
View file

@ -28,6 +28,7 @@
#include "libc/intrin/strace.internal.h"
#include "libc/sock/internal.h"
#include "libc/sock/select.h"
#include "libc/sock/select.internal.h"
#include "libc/sysv/consts/nrlinux.h"
#include "libc/sysv/errfuns.h"
@ -68,6 +69,15 @@ int pselect(int nfds, fd_set *readfds, fd_set *writefds, fd_set *exceptfds,
} ss;
BEGIN_CANCELLATION_POINT;
#ifdef SYSDEBUG
fd_set old_readfds;
fd_set *old_readfds_ptr = 0;
fd_set old_writefds;
fd_set *old_writefds_ptr = 0;
fd_set old_exceptfds;
fd_set *old_exceptfds_ptr = 0;
#endif
if (nfds < 0) {
rc = einval();
} else if (IsAsan() &&
@ -77,33 +87,55 @@ int pselect(int nfds, fd_set *readfds, fd_set *writefds, fd_set *exceptfds,
(timeout && !__asan_is_valid(timeout, sizeof(*timeout))) ||
(sigmask && !__asan_is_valid(sigmask, sizeof(*sigmask))))) {
rc = efault();
} else if (IsLinux()) {
if (timeout) {
ts = *timeout;
tsp = &ts;
} else {
tsp = 0;
}
ss.s = sigmask;
ss.n = 8;
rc = sys_pselect(nfds, readfds, writefds, exceptfds, tsp, &ss);
} else if (!IsWindows()) {
rc = sys_pselect(nfds, readfds, writefds, exceptfds,
(struct timespec *)timeout, sigmask);
} else {
if (timeout) {
tv.tv_sec = timeout->tv_sec;
tv.tv_usec = timeout->tv_nsec / 1000;
tvp = &tv;
} else {
tvp = 0;
#ifdef SYSDEBUG
if (readfds) {
old_readfds = *readfds;
old_readfds_ptr = &old_readfds;
}
if (writefds) {
old_writefds = *writefds;
old_writefds_ptr = &old_writefds;
}
if (exceptfds) {
old_exceptfds = *exceptfds;
old_exceptfds_ptr = &old_exceptfds;
}
#endif
if (IsLinux()) {
if (timeout) {
ts = *timeout;
tsp = &ts;
} else {
tsp = 0;
}
ss.s = sigmask;
ss.n = 8;
rc = sys_pselect(nfds, readfds, writefds, exceptfds, tsp, &ss);
} else if (!IsWindows()) {
rc = sys_pselect(nfds, readfds, writefds, exceptfds,
(struct timespec *)timeout, sigmask);
} else {
if (timeout) {
tv.tv_sec = timeout->tv_sec;
tv.tv_usec = timeout->tv_nsec / 1000;
tvp = &tv;
} else {
tvp = 0;
}
rc = sys_select_nt(nfds, readfds, writefds, exceptfds, tvp, sigmask);
}
rc = sys_select_nt(nfds, readfds, writefds, exceptfds, tvp, sigmask);
}
END_CANCELLATION_POINT;
POLLTRACE("pselect(%d, %p, %p, %p, %s, %s) → %d% m", nfds, readfds, writefds,
exceptfds, DescribeTimespec(0, timeout), DescribeSigset(0, sigmask),
rc);
STRACE("pselect(%d, %s → [%s], %s → [%s], %s → [%s], %s, %s) → %d% m", nfds,
DescribeFdSet(rc, nfds, old_readfds_ptr),
DescribeFdSet(rc, nfds, readfds),
DescribeFdSet(rc, nfds, old_writefds_ptr),
DescribeFdSet(rc, nfds, writefds),
DescribeFdSet(rc, nfds, old_exceptfds_ptr),
DescribeFdSet(rc, nfds, exceptfds), //
DescribeTimespec(0, timeout), //
DescribeSigset(0, sigmask), rc);
return rc;
}