| Commit message (Expand) | Author | Files | Lines |
|---|
| 2013-07-17 | make posix_spawn (and functions that use it) use CLONE_VFORK flag•••this is both a minor scheduling optimization and a workaround for a
difficult-to-fix bug in qemu app-level emulation.
from the scheduling standpoint, it makes no sense to schedule the
parent thread again until the child has exec'd or exited, since the
parent will immediately block again waiting for it.
on the qemu side, as regular application code running on an underlying
libc, qemu cannot make arbitrary clone syscalls itself without
confusing the underlying implementation. instead, it breaks them down
into either fork-like or pthread_create-like cases. it was treating
the code in posix_spawn as pthread_create-like, due to CLONE_VM, which
caused horribly wrong behavior: CLONE_FILES broke the synchronization
mechanism, CLONE_SIGHAND broke the parent's signals, and CLONE_THREAD
caused the child's exec to end the parent -- if it hadn't already
crashed. however, qemu special-cases CLONE_VFORK and emulates that
with fork, even when CLONE_VM is also specified. this also gives
incorrect semantics for code that really needs the memory sharing, but
posix_spawn does not make use of the vm sharing except to avoid
momentary double commit charge.
programs using posix_spawn (including via popen) should now work
correctly under qemu app-level emulation.
| Rich Felker | 1 | -1/+2 |
| 2013-07-17 | fix missing argument in variadic syscall macros•••for 0-argument syscalls (1 argument to the macro, the syscall number),
the __SYSCALL_NARGS_X macro's ... argument was not satisfied. newer
compilers seem to care about this.
| Rich Felker | 1 | -1/+1 |
| 2013-07-17 | fix error code on time conversion overflows•••POSIX mandates EOVERFLOW for this condition.
| Rich Felker | 4 | -4/+4 |
| 2013-07-17 | fix fd leak in file mapping code used in new zoneinfo support | Rich Felker | 1 | -1/+1 |
| 2013-07-17 | the big time handling overhaul•••this commit has two major user-visible parts: zoneinfo-format time
zones are now supported, and overflow handling is intended to be
complete in the sense that all functions return a correct result if
and only if the result fits in the destination type, and otherwise
return an error. also, some noticable bugs in the way DST detection
and normalization worked have been fixed, and performance may be
better than before, but it has not been tested.
| Rich Felker | 18 | -348/+649 |
| 2013-07-13 | fix omission of dtv setup in static linked programs on TLS variant I archs•••apparently this was never noticed before because the linker normally
optimizes dynamic TLS models to non-dynamic ones when static linking,
thus eliminating the calls to __tls_get_addr which crash when the dtv
is missing. however, some libsupc++ code on ARM was calling
__tls_get_addr when static linked and crashing. the reason is unclear
to me, but with this issue fixed it should work now anyway.
| Rich Felker | 1 | -1/+1 |
