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2018-09-12reduce spurious inclusion of libc.hRich Felker2-2/+0
libc.h was intended to be a header for access to global libc state and related interfaces, but ended up included all over the place because it was the way to get the weak_alias macro. most of the inclusions removed here are places where weak_alias was needed. a few were recently introduced for hidden. some go all the way back to when libc.h defined CANCELPT_BEGIN and _END, and all (wrongly implemented) cancellation points had to include it. remaining spurious users are mostly callers of the LOCK/UNLOCK macros and files that use the LFS64 macro to define the awful *64 aliases. in a few places, new inclusion of libc.h is added because several internal headers no longer implicitly include libc.h. declarations for __lockfile and __unlockfile are moved from libc.h to stdio_impl.h so that the latter does not need libc.h. putting them in libc.h made no sense at all, since the macros in stdio_impl.h are needed to use them correctly anyway.
2018-06-20work around broken kernel struct ipc_perm on some big endian archsRich Felker3-6/+72
the mode member of struct ipc_perm is specified by POSIX to have type mode_t, which is uniformly defined as unsigned int. however, Linux defines it with type __kernel_mode_t, and defines __kernel_mode_t as unsigned short on some archs. since there is a subsequent padding field, treating it as a 32-bit unsigned int works on little endian archs, but the order is backwards on big endian archs with the erroneous definition. since multiple archs are affected, remedy the situation with fixup code in the affected functions (shmctl, semctl, and msgctl) rather than repeating the same shims in syscall_arch.h for every affected arch.
2017-08-12fix signed overflow in ftokDaniel Sabogal1-1/+1
2014-03-13semctl: fix UB causing crashes on powerpcrofl0r1-4/+8
it's UB to fetch variadic args when none are passed, and this caused real crashes on ppc due to its calling convention, which defines that for variadic functions aggregate types be passed as pointers. the assignment caused that pointer to get dereferenced, resulting in a crash.
2014-01-08fix inadvertent use of struct in place of union for semunRich Felker1-3/+3
2014-01-08fix type of semctl variadic argumentRich Felker1-4/+10
per POSIX, the variadic argument has type union semun, which may contain a pointer or int; the type read depends on the command being issued. this allows the userspace part of the implementation to be type-correct without requiring special-casing for different commands. the kernel always expects to receive the argument interpreted as unsigned long (or equivalently, a pointer), and does its own handling of extracting the int portion from the representation, as needed. this change fixes two possible issues: most immediately, reading the argument as a (signed) long and passing it to the syscall would perform incorrect sign-extension of pointers on the upcoming x32 target. the other possible issue is that some archs may use different (user-space) argument-passing convention for unions, preventing va_arg from correctly obtaining the argument when the type long (or even unsigned long or void *) is passed to it.
2013-11-09fix harmless inconsistency in semtimedopRich Felker1-1/+1
this should not matter since the reality is that either all the sysv sem syscalls are individual syscalls, or all of them are multiplexed on the SYS_ipc syscall (depending on arch). but best to be consistent anyway.
2013-11-09implement semtimedopRich Felker2-0/+14
this is a Linux-specific extension to the sysv semaphore api.
2013-06-29prevent shmget from allocating objects that overflow ptrdiff_tRich Felker1-0/+2
rather than returning an error, we have to increase the size argument so high that the kernel will have no choice but to fail. this is because POSIX only permits the EINVAL error for size errors when a new shared memory segment would be created; if it already exists, the size argument must be ignored. unfortunately Linux is non-conforming in this regard, but I want to keep the code correct in userspace anyway so that if/when Linux is fixed, the behavior applications see will be conforming.
2013-06-28work around wrong kernel type for sem_nsems member of struct semid_dsRich Felker1-0/+7
rejecting invalid values for n is fine even in the case where a new sem will not be created, since the kernel does its range checks on n even in this case as well. by default, the kernel will bound the limit well below USHRT_MAX anyway, but it's presumably possible that an administrator could override this limit and break things.
2012-10-28fix shmdt syscall calling convention on old archsRich Felker1-1/+1
2012-09-22fix remaining IPC_64 issue (shmctl)Rich Felker2-4/+2
also cleanup cruft related to the issue
2012-09-22fix IPC_64 in msgctl tooRich Felker2-6/+2
2012-09-22fix broken semctl on systems that don't use IPC_64 flagRich Felker1-2/+6
not tested on mips and arm; they may still be broken. x86_64 should be ok now.
2011-04-17overhaul pthread cancellationRich Felker2-12/+4
this patch improves the correctness, simplicity, and size of cancellation-related code. modulo any small errors, it should now be completely conformant, safe, and resource-leak free. the notion of entering and exiting cancellation-point context has been completely eliminated and replaced with alternative syscall assembly code for cancellable syscalls. the assembly is responsible for setting up execution context information (stack pointer and address of the syscall instruction) which the cancellation signal handler can use to determine whether the interrupted code was in a cancellable state. these changes eliminate race conditions in the previous generation of cancellation handling code (whereby a cancellation request received just prior to the syscall would not be processed, leaving the syscall to block, potentially indefinitely), and remedy an issue where non-cancellable syscalls made from signal handlers became cancellable if the signal handler interrupted a cancellation point. x86_64 asm is untested and may need a second try to get it right.
2011-04-13numerous fixes to sysv ipcRich Felker3-5/+5
some of these definitions were just plain wrong, others based on outdated ancient "non-64" versions of the kernel interface. as much as possible has now been moved out of bits/* these changes break abi (the old abi for these functions was wrong), but since they were not working anyway it can hardly matter.
2011-04-06consistency: change all remaining syscalls to use SYS_ rather than __NR_ prefixRich Felker11-11/+11
2011-04-06fix incorrect (and conflicting on LP64 archs) types for sysv ipc msgq functionsRich Felker1-1/+1
2011-04-05add sysv ipc message queues (completely untested)Rich Felker4-0/+58
2011-03-20global cleanup to use the new syscall interfaceRich Felker7-14/+14
2011-02-13fixed missing cast in the non-i386 version of shmat (preparation for ports)Rich Felker1-1/+1
2011-02-12initial check-in, version 0.5.0v0.5.0Rich Felker9-0/+118