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path: root/src/runtime/os_linux.go
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2016-09-28runtime: minor simplifications to signal codeIan Lance Taylor
Change setsig, setsigstack, getsig, raise, raiseproc to take uint32 for signal number parameter, as that is the type mostly used for signal numbers. Same for dieFromSignal, sigInstallGoHandler, raisebadsignal. Remove setsig restart parameter, as it is always either true or irrelevant. Don't check the handler in setsigstack, as the only caller does that anyhow. Don't bother to convert the handler from sigtramp to sighandler in getsig, as it will never be called when the handler is sigtramp or sighandler. Don't check the return value from rt_sigaction in the GNU/Linux version of setsigstack; no other setsigstack checks it, and it never fails. Change-Id: I6bbd677e048a77eddf974dd3d017bc3c560fbd48 Reviewed-on: https://go-review.googlesource.com/29953 Run-TryBot: Ian Lance Taylor <iant@golang.org> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
2016-09-26runtime: unify Unix implementations of unminitIan Lance Taylor
Change-Id: I2cbb13eb85876ad05a52cbd498a9b86e7a28899c Reviewed-on: https://go-review.googlesource.com/29772 Run-TryBot: Ian Lance Taylor <iant@golang.org> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
2016-09-26runtime: merge setting new signal mask in minitIan Lance Taylor
All the variants that sets the new signal mask in minit do the same thing, so merge them. This requires an OS-specific sigdelset function; the function already exists for linux, and is now added for other OS's. Change-Id: Ie96f6f02e2cf09c43005085985a078bd9581f670 Reviewed-on: https://go-review.googlesource.com/29771 Run-TryBot: Ian Lance Taylor <iant@golang.org> Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org> TryBot-Result: Gobot Gobot <gobot@golang.org>
2016-09-26runtime: unify sigtrampgoIan Lance Taylor
Combine the various versions of sigtrampgo into a single function in signal_unix.go. This requires defining a fixsigcode method on sigctxt for all operating systems; it only does something on Darwin. This also requires changing the darwin/amd64 signal handler to call sigreturn itself, rather than relying on sigtrampgo to call sigreturn for it. We can then drop the Darwin sigreturn function, as it is no longer used. Change-Id: I5a0b9d2d2c141957e151b41e694efeb20e4b4b9a Reviewed-on: https://go-review.googlesource.com/29761 Run-TryBot: Ian Lance Taylor <iant@golang.org> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
2016-09-26runtime: unify handling of alternate signal stackIan Lance Taylor
Change all Unix systems to use stackt for the alternate signal stack (some were using sigaltstackt). Add OS-specific setSignalstackSP function to handle different types for ss_sp field, and unify all OS-specific signalstack functions into one. Unify handling of alternate signal stack in OS-specific minit and sigtrampgo functions via new functions minitSignalstack and setGsignalStack. Change-Id: Idc316dc69b1dd725717acdf61a1cd8b9f33ed174 Reviewed-on: https://go-review.googlesource.com/29757 Run-TryBot: Ian Lance Taylor <iant@golang.org> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
2016-09-24runtime: unify some signal handling functionsIan Lance Taylor
Unify the OS-specific versions of msigsave, msigrestore, sigblock, updatesigmask, and unblocksig into single versions in signal_unix.go. To do this, make sigprocmask work the same way on all systems, which required adding a definition of sigprocmask for linux and openbsd. Also add a single OS-specific function sigmaskToSigset. Change-Id: I7cbf75131dddb57eeefe648ef845b0791404f785 Reviewed-on: https://go-review.googlesource.com/29689 Run-TryBot: Ian Lance Taylor <iant@golang.org> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: David Crawshaw <crawshaw@golang.org>
2016-09-06runtime: fetch physical page size from the OSAustin Clements
Currently the physical page size assumed by the runtime is hard-coded. On Linux the runtime at least fetches the OS page size during init and sanity checks against the hard-coded value, but they may still differ. On other OSes we wouldn't even notice. Add support on all OSes to fetch the actual OS physical page size during runtime init and lift the sanity check of PhysPageSize from the Linux init code to general malloc init. Currently this is the only use of the retrieved page size, but we'll add more shortly. Updates #12480 and #10180. Change-Id: I065f2834bc97c71d3208edc17fd990ec9058b6da Reviewed-on: https://go-review.googlesource.com/25050 Run-TryBot: Austin Clements <austin@google.com> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Rick Hudson <rlh@golang.org>
2016-08-25all: fix assembly vet issuesJosh Bleecher Snyder
Add missing function prototypes. Fix function prototypes. Use FP references instead of SP references. Fix variable names. Update comments. Clean up whitespace. (Not for vet.) All fairly minor fixes to make vet happy. Updates #11041 Change-Id: Ifab2cdf235ff61cdc226ab1d84b8467b5ac9446c Reviewed-on: https://go-review.googlesource.com/27713 Run-TryBot: Josh Bleecher Snyder <josharian@gmail.com> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
2016-08-20runtime: remove unnecessary calls to memclrMichael Munday
Go will have already cleared the structs (the original C wouldn't have). Change-Id: I4a5a0cfd73953181affc158d188aae2ce281bb33 Reviewed-on: https://go-review.googlesource.com/27435 Run-TryBot: Michael Munday <munday@ca.ibm.com> Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org> TryBot-Result: Gobot Gobot <gobot@golang.org>
2016-06-29runtime: better error message for newosproc failureIan Lance Taylor
If creating a new thread fails with EAGAIN, point the user at ulimit. Fixes #15476. Change-Id: Ib36519614b5c72776ea7f218a0c62df1dd91a8ea Reviewed-on: https://go-review.googlesource.com/24570 Run-TryBot: Ian Lance Taylor <iant@golang.org> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
2016-04-16runtime: check kernel physical page size during initAustin Clements
The runtime hard-codes an assumed physical page size. If this is smaller than the kernel's page size or not a multiple of it, sysUnused may incorrectly release more memory to the system than intended. Add a runtime startup check that the runtime's assumed physical page is compatible with the kernel's physical page size. For #9993. Change-Id: Ida9d07f93c00ca9a95dd55fc59bf0d8a607f6728 Reviewed-on: https://go-review.googlesource.com/22064 Reviewed-by: Rick Hudson <rlh@golang.org>
2016-04-16runtime: common handling of _AT_RANDOM auxvAustin Clements
The Linux kernel provides 16 bytes of random data via the auxv vector at startup. Currently we consume this separately on 386, amd64, arm, and arm64. Now that we have a common auxv parser, handle _AT_RANDOM in the common path. Change-Id: Ib69549a1d37e2d07a351cf0f44007bcd24f0d20d Reviewed-on: https://go-review.googlesource.com/22062 Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
2016-04-16runtime: common auxv parserAustin Clements
Currently several different Linux architectures have separate copies of the auxv parser. Bring these all together into a single copy of the parser that calls out to a per-arch handler for each tag/value pair. This is in preparation for handling common auxv tags in one place. For #9993. Change-Id: Iceebc3afad6b4133b70fca7003561ae370445c10 Reviewed-on: https://go-review.googlesource.com/22061 Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org> Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Michael Hudson-Doyle <michael.hudson@canonical.com>
2016-04-06runtime: rename os1_linux.go to os_linux.goBrad Fitzpatrick
Change-Id: I938f61763c3256a876d62aeb54ef8c25cc4fc90e Reviewed-on: https://go-review.googlesource.com/21567 Reviewed-by: Minux Ma <minux@golang.org>
2016-04-06runtime: merge os_linux.go into os1_linux.goBrad Fitzpatrick
Change-Id: I791c47014fe69e8529c7b2f0b9a554e47902d46c Reviewed-on: https://go-review.googlesource.com/21566 Reviewed-by: Minux Ma <minux@golang.org>
2016-03-01all: make copyright headers consistent with one space after periodBrad Fitzpatrick
This is a subset of https://golang.org/cl/20022 with only the copyright header lines, so the next CL will be smaller and more reviewable. Go policy has been single space after periods in comments for some time. The copyright header template at: https://golang.org/doc/contribute.html#copyright also uses a single space. Make them all consistent. Change-Id: Icc26c6b8495c3820da6b171ca96a74701b4a01b0 Reviewed-on: https://go-review.googlesource.com/20111 Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org> Reviewed-by: Ian Lance Taylor <iant@golang.org> Reviewed-by: Matthew Dempsky <mdempsky@google.com> TryBot-Result: Gobot Gobot <gobot@golang.org>
2015-10-22runtime: split plan9 and solaris's m fields into new embedded mOS typeMatthew Dempsky
Reduces the size of m by ~8% on linux/amd64 (1040 bytes -> 960 bytes). There are also windows-specific fields, but they're currently referenced in OS-independent source files (but only when GOOS=="windows"). Change-Id: I13e1471ff585ccced1271f74209f8ed6df14c202 Reviewed-on: https://go-review.googlesource.com/16173 Run-TryBot: Matthew Dempsky <mdempsky@google.com> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Ian Lance Taylor <iant@golang.org>
2015-10-02runtime: drop sigfwd from signal forwarding unsupported platformsMikio Hara
This change splits signal_unix.go into signal_unix.go and signal2_unix.go and removes the fake symbol sigfwd from signal forwarding unsupported platforms for clarification purpose. Change-Id: I205eab5cf1930fda8a68659b35cfa9f3a0e67ca6 Reviewed-on: https://go-review.googlesource.com/12062 Reviewed-by: Ian Lance Taylor <iant@golang.org>
2015-07-22runtime: if we don't handle a signal on a non-Go thread, raise itIan Lance Taylor
In the past badsignal would crash the program. In https://golang.org/cl/10757044 badsignal was changed to call sigsend, to fix issue #3250. The effect of this was that when a non-Go thread received a signal, and os/signal.Notify was not being used to check for occurrences of the signal, the signal was ignored. This changes the code so that if os/signal.Notify is not being used, then the signal handler is reset to what it was, and the signal is raised again. This lets non-Go threads handle the signal as they wish. In particular, it means that a segmentation violation in a non-Go thread will ordinarily crash the process, as it should. Fixes #10139. Update #11794. Change-Id: I2109444aaada9d963ad03b1d071ec667760515e5 Reviewed-on: https://go-review.googlesource.com/12503 Reviewed-by: Russ Cox <rsc@golang.org> Run-TryBot: Ian Lance Taylor <iant@golang.org>
2015-04-24runtime: signal forwardingSrdjan Petrovic
Forward signals to signal handlers installed before Go installs its own, under certain circumstances. In particular, as iant@ suggests, signals are forwarded iff: (1) a non-SIG_DFL signal handler existed before Go, and (2) signal is synchronous (i.e., one of SIGSEGV, SIGBUS, SIGFPE), and (3a) signal occured on a non-Go thread, or (3b) signal occurred on a Go thread but in CGo code. Supported only on Linux, for now. Change-Id: I403219ee47b26cf65da819fb86cf1ec04d3e25f5 Reviewed-on: https://go-review.googlesource.com/8712 Reviewed-by: Ian Lance Taylor <iant@golang.org>
2015-04-22runtime: merge clone0 and cloneSrdjan Petrovic
We initially added clone0 to handle the case when G or M don't exist, but it turns out that we could have just modified clone. (It also helps that the function we're invoking in clone0 no longer needs arguments.) As a side-effect, newosproc0 is now supported on all linux archs. Change-Id: Ie603af75d8f164310fc16446052d83743961f3ca Reviewed-on: https://go-review.googlesource.com/9164 Reviewed-by: David Crawshaw <crawshaw@golang.org>
2015-04-03runtime: initialize shared library at library-load timeSrdjan Petrovic
This is Part 2 of the change, see Part 1 here: in https://go-review.googlesource.com/#/c/7692/ Suggested by iant@, we use the library initialization entry point to: - create a new OS thread and run the "regular" runtime init stack on that thread - return immediately from the main (i.e., loader) thread - at the first CGO invocation, we wait for the runtime initialization to complete. The above mechanism is implemented only on linux_amd64. Next step is to support it on linux_arm. Other platforms don't yet support shared library compiling/linking, but we intend to use the same strategy there as well. Change-Id: Ib2c81b1b83bee837134084b75a3beecfb8de6bf4 Reviewed-on: https://go-review.googlesource.com/8094 Run-TryBot: Srdjan Petrovic <spetrovic@google.com> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Ian Lance Taylor <iant@golang.org>
2015-01-14runtime: log all thread stack traces during GODEBUG=crash on Linux and OS XRuss Cox
Normally, a panic/throw only shows the thread stack for the current thread and all paused goroutines. Goroutines running on other threads, or other threads running on their system stacks, are opaque. Change that when GODEBUG=crash, by passing a SIGQUIT around to all the threads when GODEBUG=crash. If this works out reasonably well, we might make the SIGQUIT relay part of the standard panic/throw death, perhaps eliding idle m's. Change-Id: If7dd354f7f3a6e326d17c254afcf4f7681af2f8b Reviewed-on: https://go-review.googlesource.com/2811 Reviewed-by: Rick Hudson <rlh@golang.org>
2014-11-11[dev.cc] runtime: convert operating system support code from C to GoRuss Cox
The conversion was done with an automated tool and then modified only as necessary to make it compile and run. [This CL is part of the removal of C code from package runtime. See golang.org/s/dev.cc for an overview.] LGTM=r R=r CC=austin, dvyukov, golang-codereviews, iant, khr https://golang.org/cl/174830044
2014-09-16runtime: remove duplicated Go constantsRuss Cox
The C header files are the single point of truth: every C enum constant Foo is available to Go as _Foo. Remove or redirect duplicate Go declarations so they cannot be out of sync. Eventually we will need to put constants in Go, but for now having them be out of sync with C is too risky. These predate the build support for auto-generating Go constants from the C definitions. LGTM=iant R=iant CC=golang-codereviews https://golang.org/cl/141510043
2014-09-08build: move package sources from src/pkg to srcRuss Cox
Preparation was in CL 134570043. This CL contains only the effect of 'hg mv src/pkg/* src'. For more about the move, see golang.org/s/go14nopkg.
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