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  • Can I use POSIX signals in my Perl program to create event-driven programming?

    - by Shiftbit
    Is there any POSIX signals that I could utilize in my Perl program to create event-driven programming? Currently, I have multi-process program that is able to cross communicate but my parent thread is only able to listen to listen at one child at a time. foreach (@proc) { sysread(${$_}{'read'}, my $line, 100); #problem here chomp($line); print "Parent hears: $line\n"; } The problem is that the parent sits in a continual wait state until it receives it a signal from the first child before it can continue on. I am relying on 'pipe' for my intercommunication. My current solution is very similar to: http://stackoverflow.com/questions/2558098/how-can-i-use-pipe-to-facilitate-interprocess-communication-in-perl If possible I would like to rely on a $SIG{...} event or any non-CPAN solution. Update: As Jonathan Leffler mentioned, kill can be used to send a signal: kill USR1 = $$; # send myself a SIGUSR1 My solution will be to send a USR1 signal to my child process. This event tells the parent to listen to the particular child. child: kill USR1 => $parentPID if($customEvent); syswrite($parentPipe, $msg, $buffer); #select $parentPipe; print $parentPipe $msg; parent: $SIG{USR1} = { #get child pid? sysread($array[$pid]{'childPipe'}, $msg, $buffer); }; But how do I get my the source/child pid that signaled the parent? Have the child Identify itself in its message. What happens if two children signal USR1 at the same time?

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  • Matlab computations done over Apple Filing Protocol (AFP) depend on POSIX permissions, ignores ACLs

    - by flumignan
    I'm a system administrator and have never used Matlab, so forgive my general ignorance of the program. My users have encountered problems when executing scripted Matlab actions over AFP to a Mac OS X Server 10.6.7 where the access control list (ACL) should allow actions, but the POSIX-style permissions disallow the activity. It seems as if Matlab, run locally on the Mac workstations on datasets on the remote server, ignores the ACLs entirely. This is the only application I've ever seen behave this way. The server's filesystem is HFS+J and all other activity is performing as expected. These users cannot use CIFS because of our integration with external directory systems. In this example, the directory bxdata, the members of the group cibturner should be able to modify the files. Indeed, they can using any other method except via Matlab scripts. When the Matlab script hits these files, the POSIX permissions of 644 disallow modification. It's as if the ACLs are irrelevant. [root@cib 16:00:24 /14181.2_5sM]# ls -leh@ bxdata/ total 128 -rw-r--r--+ 1 kel32 staff 18K Feb 15 09:31 TS-5sMath030708-21073-1.edat 0: group:cibturner inherited allow read,write,execute,append,readattr,writeattr,readextattr,writeextattr,readsecurity,writesecurity,chown 1: group:cibsrlocaladmins inherited allow read,write,execute,append,readattr,writeattr,readextattr,writeextattr,readsecurity,writesecurity,chown 2: group:crcservergroup inherited allow read,write,execute,append,readattr,writeattr,readextattr,writeextattr,readsecurity,writesecurity,chown -rw-r--r--+ 1 kel32 staff 25K Feb 15 09:31 TS-5sMath030708-21073-1.txt 0: group:cibturner inherited allow read,write,execute,append,readattr,writeattr,readextattr,writeextattr,readsecurity,writesecurity,chown 1: group:cibsrlocaladmins inherited allow read,write,execute,append,readattr,writeattr,readextattr,writeextattr,readsecurity,writesecurity,chown 2: group:crcservergroup inherited allow read,write,execute,append,readattr,writeattr,readextattr,writeextattr,readsecurity,writesecurity,chown Because this server has HIPAA data, security is critical. We are not using networked home directories or SAN technology. The MatLab program is run on the user's hard drive; access is granted via Kerberized AFP.

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  • Is there a way to ‘join’ (block) in POSIX threads, without exiting the joinee?

    - by elliottcable
    I’m buried in multithreading / parallelism documents, trying to figure out how to implement a threading implementation in a programming language I’ve been designing. I’m trying to map a mental model to the pthreads.h library, but I’m having trouble with one thing: I need my interpreter instances to continue to exist after they complete interpretation of a routine (the language’s closure/function data type), because I want to later assign other routines to them for interpretation, thus saving me the thread and interpreter setup/teardown time. This would be fine, except that pthread_join(3) requires that I call pthread_exit(3) to ‘unblock’ the original thread. How can I block the original thread (when it needs the result of executing the routine), and then unblock it when interpretation of the child routine is complete?

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  • How to convert a PCRE to a POSIX RE?

    - by David M
    This interesting question http://stackoverflow.com/questions/2837267/ concerned how to do a negative look-ahead in MySQL. The poster wanted to get the effect of Kansas(?! State) because MySQL doesn't implement look-ahead assertions, a number of answers came up the equivalent Kansas($|[^ ]| ($|[^S])| S($|[^t])| St($|[^a])| Sta($|[^t])| Stat($|[^e])) The poster pointed out that's a PITA to do for potentially lots of expressions. Is there a script/utility/mode of PCRE (or some other package) that will convert a PCRE (if possible) to an equivalent regex that doesn't use Perl's snazzy features? I'm fully aware that some Perl-style regexes cannot be stated as an ordinary regex, so I would not expect the tool to do the impossible, of course!

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  • POSIX threads and signals

    - by Donal Fellows
    I've been trying to understand the intricacies of how POSIX threads and POSIX signals interact. In particular, I'm interested in: What's the best way to control which thread a signal is delivered to (assuming it isn't fatal in the first place)? What is the best way to tell another thread (that might actually be busy) that the signal has arrived? (I already know that it's a bad idea to be using pthread condition variables from a signal handler.) For reference about why I want this, I'm researching how to convert the TclX package to support threads, or to split it up and at least make some useful parts support threads. Signals are one of those parts that is of particular interest.

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  • What''s the "earliest" place one can set an environment variable during Linux boot process?

    - by amn
    I know I can set a variable in a shell startup file, but the thing is, I am trying to set up a POSIX-compatible environment, and a POSIX shell does not parse any startup files other than the one specified by the environment variable ENV. This presents a problem - currently my login starts the shell as bash, which I will try to replace with sh so Bash runs as POSIX shell - however then it will not parse the default startup files and I need ENV set to specify these. Which means as far as I understand that I need to specify ENV before login starts the shell, correct? Now, how would I do that? I hope my question is clear, if not I will gladly redact it.

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  • warning C4996: 'getch': The POSIX name for this item is deprecated

    - by Maziah Mohd Zaki
    1c:\users\user\documents\visual studio 2008\projects\bengkel\bengkel\login.cpp(196) : warning C4996: 'getch': The POSIX name for this item is deprecated. Instead, use the ISO C++ conformant name: _getch. See online help for details. 1 c:\program files\microsoft visual studio 9.0\vc\include\conio.h(145) : see declaration of 'getch' 1c:\users\user\documents\visual studio 2008\projects\bengkel\bengkel\login.cpp(199) : warning C4996: 'getch': The POSIX name for this item is deprecated. Instead, use the ISO C++ conformant name: _getch. See online help for details. 1 c:\program files\microsoft visual studio 9.0\vc\include\conio.h(145) : see declaration of 'getch' 1c:\users\user\documents\visual studio 2008\projects\bengkel\bengkel\login.cpp(203) : warning C4065: switch statement contains 'default' but no 'case' labels 1c:\users\user\documents\visual studio 2008\projects\bengkel\bengkel\login.cpp(225) : warning C4996: 'strcpy': This function or variable may be unsafe. Consider using strcpy_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details. 1 c:\program files\microsoft visual studio 9.0\vc\include\string.h(74) : see declaration of 'strcpy'

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  • Weird permission issue with POSIX ACLs, NFS v3 on Linux

    - by jon
    I have two Linux systems, both running Debian Squeeze. Versions of (I think) the stuff involved are: kernel: 2.6.32-5-xen-amd64 ii nfs-kernel-server 1:1.2.2-4squeeze2 support for NFS kernel server ii libnfsidmap2 0.23-2 An nfs idmapping library ii nfs-common 1:1.2.2-4squeeze2 NFS support files common to client and server ii portmap 6.0.0-2 RPC port mapper (The client doesn't have nfs-kernel-server involved.) I have a directory with ACLs: # file: dirname # owner: jon # group: foogroup # flags: -s- user::rwx user:www-data:rwx group::r-x group:foogroup:rwx mask::rwx other::r-x default:... There are two users, neither one of which owns the directory: uid=3001(jake) gid=3001(jake) groups=3001(jake),104(wheel),3999(foogroup) uid=3005(nic) gid=3005(nic) groups=3005(nic),3999(foogroup) The jake user can create files in the directory without issues. The nic user can't. All UIDs/GIDs are the same on the client and server. I've verified (packet sniffing) that the right uids/gids get sent via AUTH_UNIX are correct-- uid=gid=3005, auxiliary gids=3005,3999-- and that the server replies with NFS3ERR_ACCESS, which the kernel on the client maps to EACCES (Permission denied). Can anyone help me here?

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  • What open source POSIX compliance test suites are available?

    - by Richard Pennington
    I'm working on a small open source project, ELLCC, that uses clang/LLVM as a cross compiler for various target processors. For the runtime environment, I'm using the NetBSD libraries and porting them to target Linux and standalone systems. I want to run a POSIX compliance test suite on the code. I've found the Open POSIX Test Suite, which looks like a good start, but it hasn't been updated since 2005. I've done some preliminary testing (with gcc and ecc under Linux), and it looks like it needs a few updates for modern compilers. My questions are: Does the Open POSIX Test Suite live on somewhere in a more up to date form? Are there other open source alternatives?

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  • C++: posix regex error reporting?

    - by Helltone
    I'm writing a small C++ program that parses some strings. I chose to use C's regex.h because I only need POSIX Extended Syntax and I'm concerned with portability. However, I've just noticed that when regexec fails to match, it returns != 0 and I have no idea of what was wrong :-(. I expected to be able to display at least a small message like: line:col: Syntax error or giig sdoigosdigo* sodfg ^ Syntax error Is there a way to know which character did not match? Should I use boost:regex instead? For reference, my regex is: "^" "[ ;\t\n]*" "(" // (1) identifier "[a-zA-Z_][a-zA-Z0-9_]*" ")" "[ \t]*" "(" // (2) non-marking "\[" "(" // (3) non-marking "[ \t]*" "(" // (4..n-1) argument "[a-zA-Z0-9_]+" ")" "[ \t]*" "," ")*" "[ \t]*" "(" // (n) last argument "[a-zA-Z0-9_]+" ")" "]" ")?" "[ \t\n]*" ";" Which matches for instance blablabla[arg1, arg2];

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  • iPhone filesystem permissions POSIX-compliant?

    - by Seva Alekseyev
    Hi all, I'm trying to pass some files from one app to another. I communicate the path (via a custom URL). The target application cannot read the file, citing errno 13 (permission denied). I've checked the permissions on file - they're 0644 (O+R), the permissions on directories all the way up to the root are 755 (O+RX). From a POSIX perspective, the file should be readable to any process and any user. Yet it's not. Any ideas, please? I can think of some workarounds. I could use a Web service (upload, get a cookie, communicate the cookie to the other app, other app downloads). I could also pass the actual file data in the URL - unelegant, and probably subject to length limitations. Clipboard is not supported on iPhone OS 2 IIRC.

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  • iPhone filesystem POSIX-compliant?

    - by Seva Alekseyev
    Hi all, I'm trying to pass some files from one app to another. I communicate the path (via a custom URL). The target application cannot read the file, citing errno 13 (permission denied). I've checked the permissions on file - they're 0644 (O+R), the permissions on directories all the way up to the root are 755 (O+RX). From a POSIX perspective, the file should be readable to any process and any user. Yet it's not. Any ideas, please? I can think of some workarounds. I could use a Web service (upload, get a cookie, communicate the cookie to the other app, other app downloads). I could also pass the actual file data in the URL - unelegant, and probably subject to length limitations. Clipboard is not supported on iPhone OS 2 IIRC.

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  • posix pthreads in c

    - by Codenotguru
    Iam new to c programming and needs some help. long *taskids[NUM_THREADS]; for(t=0; t<NUM_THREADS; t++) { taskids[t] = (long *) malloc(sizeof(long)); *taskids[t] = t; printf("Creating thread %ld\n", t); rc = pthread_create(&threads[t], NULL, PrintHello, (void *) taskids[t]); ... } This code fragment demonstrates how to pass a simple integer to each thread. The calling thread uses a unique data structure for each thread, insuring that each thread's argument remains intact throughout the program. Iam not able to understand how this is happening can somebody explain it??

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  • Explain why folder's permissions differ depending on HOW user is accessing server AFP vs SSH

    - by Meltemi
    Hoping someone can explain what is probably fairly obvious...but confuses me. Imagine two users with admin privileges on our server (Mac OS X Server 10.5). Call them joe & bob. both users are members of these groups: Staff Group ID: 20 Workgroup Group ID: 1025 Shared folder "devfolder" has sharing set as so: POSIX: Owner: joe read & write Group: admin read & write Other no access ACL: Workgroup Allow Read & write Question is why when looking at same folder does the ownership appear to change depending on who's doing the looking?!? Both looking at same folder on the server: From Joe's perspective: xserve:devfolder joe$ ls -l drwxrwxr-x 6 joe workgroup 204 May 20 19:32 app drwxrwxr-x 9 joe workgroup 306 May 20 19:32 config drwxrwxr-x 3 joe workgroup 102 May 20 19:32 db drwxrwxr-x 3 joe workgroup 102 May 20 19:32 doc drwxrwxr-x 3 joe workgroup 102 May 20 19:32 lib And from Bob's perspective (folder mounted on his machine via AFP): bobmac:devfolder bob$ ls -l drwxrwxr-x 6 bob _bob 264 May 20 19:32 app drwxrwxr-x 9 bob _bob 264 May 20 19:32 config drwxrwxr-x 3 bob _bob 264 May 20 19:32 db drwxrwxr-x 3 bob _bob 264 May 20 19:32 doc drwxrwxr-x 3 bob _bob 264 May 20 19:32 lib Now if Bob connects to server via SSH then his output is identical to Joe's, as expected. Can anyone tell me what the client is doing in this case and what should be expected when bob creates or updates files in this folder? What tools do I have to better understand this from the command line? Is this normal? Perhaps a "cleaner" way that wouldn't be confusing with "bob _bob"?!?

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  • Specify default group and permissions for new files in a certain directory

    - by mislav
    I have a certain directory in which there is a project shared by multiple users. These users use SSH to gain access to this directory and modify/create files. This project should only be writeable to a certain group of users: lets call it "mygroup". During an SSH session, all files/directories created by the current user should by default be owned by group "mygroup" and have group-writeable permissions. I can solve the permissions problem with umask: $ cd project $ umask 002 $ touch test.txt File "test.txt" is now group-writeable, but still belongs to my default group ("mislav", same as my username) and not to "mygroup". I can chgrp recursively to set the desired group, but I wanted to know is there a way to set some group implicitly like umask changes default permissions during a session. This specific directory is a shared git repo with a working copy and I want git checkout and git reset operations to set the correct mask and group for new files created in the working copy. The OS is Ubuntu Linux. Update: a colleague suggests I should look into getfacl/setfacl of POSIX ACL but the solution below combined with umask 002 in the current session is good enough for me and is much more simple.

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  • Specify default group and permissions for new files in a certain directory

    - by mislav
    I have a certain directory in which there is a project shared by multiple users. These users use SSH to gain access to this directory and modify/create files. This project should only be writeable to a certain group of users: lets call it "mygroup". During an SSH session, all files/directories created by the current user should by default be owned by group "mygroup" and have group-writeable permissions. I can solve the permissions problem with umask: $ cd project $ umask 002 $ touch test.txt File "test.txt" is now group-writeable, but still belongs to my default group ("mislav", same as my username) and not to "mygroup". I can chgrp recursively to set the desired group, but I wanted to know is there a way to set some group implicitly like umask changes default permissions during a session. This specific directory is a shared git repo with a working copy and I want git checkout and git reset operations to set the correct mask and group for new files created in the working copy. The OS is Ubuntu Linux. Update: a colleague suggests I should look into getfacl/setfacl of POSIX ACL but the solution below combined with umask 002 in the current session is good enough for me and is much more simple.

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  • [Applescript] Getting the file name of files dropped on the script

    - by Petruza
    I made this Applescript script to create symbolic links. Appart from POSIX path of, how can I get the file name, without the path, of the dropped file? on open filelist repeat with i in filelist do shell script "ln -s " & POSIX path of i & " /Users/me/Desktop/symlink" end repeat end open PS: I know this expects many files to be dropped and tries to create many links with the same name, which gives an error. Actually I copied this example from a website and as I don't know almost anything about Applescript, I don't know how to do this for a single file, help on that would be appreciated too.

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  • Using sqlite from vala without dependence on glib

    - by celil
    I need to use the Sqlite vapi without any depedence on GLib. SQlite is non-gobject library, so it should be possible to do that. However, when I try to compile the following file with the --profile posix option, using Sqlite; void main() { stdout.printf("Hello, World!"); } I get am error messages: sqlite3.vapi:357.56-357.59: error: The symbol `GLib' could not be found public int bind_blob (int index, void* value, int n, GLib.DestroyNotify destroy_notify); ^^^^ sqlite3.vapi:362.68-362.71: error: The symbol `GLib' could not be found public int bind_text (int index, owned string value, int n = -1, GLib.DestroyNotify destroy_notify = GLib.g_free); ^^^^ sqlite3.vapi:411.42-411.45: error: The symbol `GLib' could not be found public void result_blob (uint8[] data, GLib.DestroyNotify? destroy_notify = GLib.g_free); ^^^^ sqlite3.vapi:420.59-420.62: error: The symbol `GLib' could not be found public void result_text (string value, int length = -1, GLib.DestroyNotify? destroy_notify = GLib.g_free); ^^^^ Compilation failed: 4 error(s), 0 warning(s) It seems that several of the functions defined in the sqlite vapi make references to the GLib.g_free and GLib.DestroyNotify symbols. Are there any posix alternatives to those?

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  • alignment and granularity of mmap

    - by OwnWaterloo
    I am confused by the specification of mmap. Let pa be the return address of mmap (the same as the specification) pa = mmap(addr, len, prot, flags, fildes, off); In my opinion after the function call succeed the following range is valid [ pa, pa+len ) My question is whether the range of the following is still valid? [ round_down(pa, pagesize) , round_up(pa+len, pagesize) ) [ base, base + size ] for short That is to say: is the base always aligned on the page boundary? is the size always a multiple of pagesize (the granularity is pagesize in other words) Thanks for your help. I think it is implied in this paragraph : The off argument is constrained to be aligned and sized according to the value returned by sysconf() when passed _SC_PAGESIZE or _SC_PAGE_SIZE. When MAP_FIXED is specified, the application shall ensure that the argument addr also meets these constraints. The implementation performs mapping operations over whole pages. Thus, while the argument len need not meet a size or alignment constraint, the implementation shall include, in any mapping operation, any partial page specified by the range [pa,pa+len). But I'm not sure and I do not have much experience on POSIX. Please show me some more explicit and more definitive evidence Or show me at least one system which supports POSIX and has different behavior Thanks agian.

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  • NFS Client library

    - by Reflog
    Hello. I'm looking for some stand alone library to access NFS shares. I am not looking for mounting the shares, just browsing and accessing the files for reading. Preferable something with a simple simple API similar to regular POSIX operations of opendir, scandir, read and etc. Thanks in advance!

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