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* avoid setting errno when checking for ttyRich Felker2011-04-152-2/+2
| | | | | | | setting errno here is completely valid, but some programs, notably busybox printf, assume that errno will not be set during output and treat this as an error condition. in any case, skipping it slightly reduces code size and saves time.
* make tmpfile slightly more efficient (use unlink syscall instead of remove)Rich Felker2011-04-141-1/+1
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* change sem_trywait algorithm so it never has to call __wakeRich Felker2011-04-141-3/+2
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* cheap trick to further optimize locking normal mutexesRich Felker2011-04-142-2/+2
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* use a separate signal from SIGCANCEL for SIGEV_THREAD timersRich Felker2011-04-146-11/+29
| | | | | | otherwise we cannot support an application's desire to use asynchronous cancellation within the callback function. this change also slightly debloats pthread_create.c.
* simplify cancellation point handlingRich Felker2011-04-132-16/+5
| | | | | | we take advantage of the fact that unless self->cancelpt is 1, cancellation cannot happen. so just increment it by 2 to temporarily block cancellation. this drops pthread_create.o well under 1k.
* simplify syslog, add vsyslog interface (nonstandard)Rich Felker2011-04-131-31/+36
| | | | | | | | with datagram sockets, depending on fprintf not to flush the output early was very fragile; the new version simply uses a small fixed-size buffer. it could be updated to dynamic-allocate large buffers if needed, but i can't envision any admin being happy about finding 64kb-long lines in their syslog...
* remove useless SIGPIPE protection from syslogRich Felker2011-04-131-9/+0
| | | | per the standard, SIGPIPE is not generated for SOCK_DGRAM.
* fix syslog (corrected SIGPIPE blocking, and using dgram instead of stream)Rich Felker2011-04-131-10/+8
| | | | | | it actually appears the hacks to block SIGPIPE are probably not necessary, and potentially harmful. if i can confirm this, i'll remove them.
* numerous fixes to sysv ipcRich Felker2011-04-133-5/+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| | | | | | | | | | some of these definitions were just plain wrong, others based on outdated ancient "non-64" versions of the kernel interface.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.
* add syscall wrapper for flockRich Felker2011-04-131-0/+7
| | | | | | | | it should be noted that flock does not mix well with standard fcntl locking, but nonetheless some applications will attempt to use flock instead of fcntl if both exist. options to configure or small patches may be needed. debian maintainers have plenty of experience with this unfortunate situation...
* fix bug whereby getopt_long allowed mismatch in last char of option nameRich Felker2011-04-131-1/+1
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* implement getgrouplist (for initgroups), formerly dummied-out v0.7.8Rich Felker2011-04-131-4/+16
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* fix prototypes/signature for setgroups, etc.Rich Felker2011-04-131-1/+1
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* implement memrchr (nonstandard) and optimize strrchr in terms of itRich Felker2011-04-132-4/+15
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* add ptsname_r (nonstandard) and split ptsname (standard) to separate fileRich Felker2011-04-132-11/+16
| | | | this eliminates the ugly static buffer in programs that use ptsname_r.
* speed up threaded forkRich Felker2011-04-121-2/+1
| | | | | | after fork, we have a new process and the pid is equal to the tid of the new main thread. there is no need to make two separate syscalls to obtain the same number.
* optimize ntohl etc. in terms of bswap functionsRich Felker2011-04-124-20/+12
| | | | | | | we can do this without violating the namespace now that they are macros/inline functions rather than extern functions. the motivation is that gcc was generating giant, slow, horrible code for the old functions, and now generates a single byte-swapping instruction.
* move bswap functions to static inline in byteswap.hRich Felker2011-04-122-16/+0
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* fix broken bswap_32Rich Felker2011-04-121-1/+1
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* fix printf("%.9g", 1.1) and similar not dropping trailing zerosRich Felker2011-04-121-1/+3
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* fix errno handling in scandir:Rich Felker2011-04-111-2/+1
| | | | | | 1. saved errno was not being restored, illegally clearing errno to 0. 2. no need to backup and save errno around free; it will not touch except perhaps when the program has already invoked UB...
* fix fputwc return valueRich Felker2011-04-111-1/+1
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* remove ugly warning-suppression hack from crypt - this invokes UB!Rich Felker2011-04-111-1/+1
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* run pthread tsd destructors when a timer thread pretends to exitRich Felker2011-04-091-0/+6
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* greatly improve SIGEV_THREAD timersRich Felker2011-04-093-15/+21
| | | | | calling pthread_exit from, or pthread_cancel on, the timer callback thread will no longer destroy the timer.
* work around a nasty bug in linux readv syscallRich Felker2011-04-091-3/+4
| | | | | | | | | | | | | | | | according to posix, readv "shall be equivalent to read(), except..." that it places the data into the buffers specified by the iov array. however on linux, when reading from a terminal, each iov element behaves almost like a separate read. this means that if the first iov exactly satisfied the request (e.g. a length-one read of '\n') and the second iov is nonzero length, the syscall will block again after getting the blank line from the terminal until another line is read. simply put, entering a single blank line becomes impossible. the solution, fortunately, is simple. whenever the buffer size is nonzero, reduce the length of the requested read by one byte and let the last byte go through the buffer. this way, readv will already be in the second (and last) iov, and won't re-block on the second iov.
* better fix sysconf pthread stack minRich Felker2011-04-081-1/+1
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* consistency with pthread stack min in limits.hRich Felker2011-04-081-1/+1
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* fix broken sigsetjmp on x86_64Rich Felker2011-04-081-7/+9
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* workaround broken msghdr struct on 64bit linuxRich Felker2011-04-082-0/+21
| | | | | | | | | | | POSIX clearly specifies the type of msg_iovlen and msg_controllen, and Linux ignores it and makes them both size_t instead. to work around this we add padding (instead of just using the wrong types like glibc does), but we also need to patch-up the struct before passing it to the kernel in case the caller did not zero-fill it. if i could trust the kernel to just ignore the upper 32 bits, this would not be necessary, but i don't think it will ignore them...
* fix ipv6 address printing: 2001 appeared as 201, etc.Rich Felker2011-04-081-3/+5
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* fix broken dns response parsing code that made most ipv6 lookups failRich Felker2011-04-081-4/+6
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* return the requested string as the "canonical name" for numeric addressesRich Felker2011-04-081-0/+1
| | | | | | | | previously NULL was returned in ai_canonname, resulting in crashes in some callers. this behavior was incorrect. note however that the new behavior differs from glibc, which performs reverse dns lookups. POSIX is very clear that a reverse DNS lookup must not be performed for numeric addresses.
* fix uninitialized variables in dns lookup codeRich Felker2011-04-071-2/+2
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* fix bug in TRE found by clang (typo && instead of &)Rich Felker2011-04-071-1/+1
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* fix misplaced *'s in string functions (harmless)Rich Felker2011-04-073-3/+3
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* fix broken unsigned comparison in wcstoumaxRich Felker2011-04-071-1/+1
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* fix breakage due to converting a return type to size_t in iconv...Rich Felker2011-04-071-1/+1
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* fixed crash in new rsyscall (failure to set sa_flags for signal handler)Rich Felker2011-04-061-0/+2
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* consistency: change all remaining syscalls to use SYS_ rather than __NR_ prefixRich Felker2011-04-0638-40/+40
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* move rsyscall out of pthread_create moduleRich Felker2011-04-0610-109/+133
| | | | | | | | | | | | | | this is something of a tradeoff, as now set*id() functions, rather than pthread_create, are what pull in the code overhead for dealing with linux's refusal to implement proper POSIX thread-vs-process semantics. my motivations are: 1. it's cleaner this way, especially cleaner to optimize out the rsyscall locking overhead from pthread_create when it's not needed. 2. it's expected that only a tiny number of core system programs will ever use set*id() functions, whereas many programs may want to use threads, and making thread overhead tiny is an incentive for "light" programs to try threads.
* pthread exit stuff: don't bother setting errno when we won't check it.Rich Felker2011-04-061-2/+2
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* fix rsyscall handler: must not clobber errno from signal contextRich Felker2011-04-061-2/+4
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* add startup abi functions, dummy for now. eventually needed for c++ support.Rich Felker2011-04-062-0/+10
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* add _res (__res_state()) dummyRich Felker2011-04-061-0/+9
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* fix prototype for strsepRich Felker2011-04-061-0/+1
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* fix completely bogus loop condition in getmntent_rRich Felker2011-04-061-1/+1
| | | | | somehow this worked on my simple fstab, but horribly broke in general, leading to use of uninitialized offset array and crashes.
* major semaphore improvements (performance and correctness)Rich Felker2011-04-065-21/+37
| | | | | 1. make sem_[timed]wait interruptible by signals, per POSIX 2. keep a waiter count in order to avoid unnecessary futex wake syscalls
* fix signal-based timers with null sigevent argumentRich Felker2011-04-065-28/+19
| | | | | | | | | | | | | since timer_create is no longer allocating a structure for the timer_t and simply using the kernel timer id, it was impossible to specify the timer_t as the argument to the signal handler. the solution is to pass the null sigevent pointer on to the kernel, rather than filling it in userspace, so that the kernel does the right thing. however, that precludes the clever timerid-versus-threadid encoding we were doing. instead, just assume timerids are below 1M and thread pointers are above 1M. (in perspective: timerids are sequentially allocated and seem limited to 32k, and thread pointers are at roughly 3G.)