diff options
Diffstat (limited to 'glibc')
| -rw-r--r-- | glibc/fallocate.mdwn | 17 | ||||
| -rw-r--r-- | glibc/fork.mdwn | 18 | ||||
| -rw-r--r-- | glibc/signals.mdwn | 32 |
3 files changed, 57 insertions, 10 deletions
diff --git a/glibc/fallocate.mdwn b/glibc/fallocate.mdwn new file mode 100644 index 00000000..3aecf16b --- /dev/null +++ b/glibc/fallocate.mdwn @@ -0,0 +1,17 @@ +[[!meta copyright="Copyright © 2010 Free Software Foundation, Inc."]] + +[[!meta license="""[[!toggle id="license" text="GFDL 1.2+"]][[!toggleable +id="license" text="Permission is granted to copy, distribute and/or modify this +document under the terms of the GNU Free Documentation License, Version 1.2 or +any later version published by the Free Software Foundation; with no Invariant +Sections, no Front-Cover Texts, and no Back-Cover Texts. A copy of the license +is included in the section entitled [[GNU Free Documentation +License|/fdl]]."]]"""]] + +Not yet implemented for the GNU Hurd in [[glibc]]. + + +# External + + * [*Punching holes in files*](http://lwn.net/Articles/415889/), Jonathan + Corbet, 2010-11-17. diff --git a/glibc/fork.mdwn b/glibc/fork.mdwn index e8556a91..378fe835 100644 --- a/glibc/fork.mdwn +++ b/glibc/fork.mdwn @@ -14,10 +14,10 @@ Our implementation in [[glibc]] is and needs to be rather bulky. For example, it has to duplicate all port rights for the new [[Mach task|microkernel/mach/task]]. The address space can simply be duplicated by -standard means of the [[microkernel/Mach]], but as [[file descriptor]]s (for -example) are a concept that is implemented inside [[glibc]] (based on [[Mach -port|microkernel/mach/port]]s), these have to be duplicated from userspace, -which requires a small number of [[RPC]] for each of them. +standard means of the [[microkernel/Mach]], but as [[unix/file_descriptor]]s +(for example) are a concept that is implemented inside [[glibc]] (based on +[[Mach port|microkernel/mach/port]]s), these have to be duplicated from +userspace, which requires a small number of [[RPC]] for each of them. In sum, [[this affects performance|open_issues/performance/fork]] when new processes are continuously being spawned from the shell, for example. @@ -43,7 +43,7 @@ they have patches for software packages, to avoid using `fork` followed by ([[!taglink open_issue_glibc]]). * Include de-duplicate information from elsewhere: [[hurd-paper]], - [[hurd-talk]] [[hurd/ng/trivialconfinementvsconstructorvsfork]], + [[hurd-talk]], [[hurd/ng/trivialconfinementvsconstructorvsfork]], [[open_issues/resource_management_problems/zalloc_panics]] ([[!taglink open_issue_glibc open_issue_documentation]]). @@ -54,13 +54,11 @@ they have patches for software packages, to avoid using `fork` followed by ## Related - * [[secure file descriptor handling]]. + * [[open_issues/secure_file_descriptor_handling]]. # External - * [*How fork(2) ought to be*](http://www.greenend.org.uk/rjk/fork.html) by - Richard Kettlewell. + * {{$unix#djb_self-pipe}}. - * [*The self-pipe trick*](http://cr.yp.to/docs/selfpipe.html) by - D. J. Bernstein. + * {{$unix#rjk_fork}}. diff --git a/glibc/signals.mdwn b/glibc/signals.mdwn new file mode 100644 index 00000000..40fdc0e1 --- /dev/null +++ b/glibc/signals.mdwn @@ -0,0 +1,32 @@ +[[!meta copyright="Copyright © 2010 Free Software Foundation, Inc."]] + +[[!meta license="""[[!toggle id="license" text="GFDL 1.2+"]][[!toggleable +id="license" text="Permission is granted to copy, distribute and/or modify this +document under the terms of the GNU Free Documentation License, Version 1.2 or +any later version published by the Free Software Foundation; with no Invariant +Sections, no Front-Cover Texts, and no Back-Cover Texts. A copy of the license +is included in the section entitled [[GNU Free Documentation +License|/fdl]]."]]"""]] + +*[[UNIX]] signals* are a means to asynchronously invoke a specific function +(*signal handler*). This may impact on [[system call]]s that are executing at +the same time in that they may be completely aborted, return incomplete +results, scheduled for restarting, or cause signal delivery to be blocked upon +the system call's completion. + +An explanation can be found in the relevant standards, an overview, including +UNIX signals' deficiencies is given in {{$unix#2010_brown_ghosts_3}}, for +example. + +The UNIX signalling mechanism is implemented for the GNU Hurd by means of a +separate signal-handling thread that is part of every process. This makes +handling of signals a separate thread of control. + + * [[SA_SIGINFO, SA_SIGACTION|open_issues/sa_siginfo_sa_sigaction]] + + +# External + + * {{$unix#djb_self-pipe}}. + + * {{$unix#rjk_fork}}. |