c - Debugging signal handlers on Linux -


i've set signal handler sigchld. out of curiosity, i'd try , debug signal handler within gdb. there way that?

i tried setting breakpoint on handler , running binary within gdb; dont seem able debug handler instruction instruction. there way go doing that? tried setting hardware breakpoint did not either. code i'm playing around shown below.

i'm trying on 64 bit ubuntu machine.

#include <stdio.h> #include <stdlib.h> #include <signal.h> #include <unistd.h> #include <sys/types.h> #include <sys/wait.h>  int val = 0; void handler(int sig) {   val=1; }  int main(int argc, const char *argv[]) {   int pid, status;   signal(sigchld, handler);    pid = fork();   if ( pid == 0 ) exit(0);    wait(&status);   printf("returned handler %d\n", val);   return 0; }

the output printed "returned handler 1" showing sigchld handled process , not gdb; info signal within gdb suggests same.

gdb’s handle command can used. handle command takes, argument, list of signals (to handled) followed actions. can use following gdb options nostop & pass (let program see signal).
http://sunsite.ualberta.ca/documentation/gnu/gdb-5.0/html_node/gdb_38.html


Comments

Post a Comment

Popular posts from this blog

android - Get AccessToken using signpost OAuth without opening a browser (Two legged Oauth) -

i using signpost oauth access data magento server. have read various tutorials on same , reach point open browser user can enter credentials. however, per requirement have automate part. hence, user should not browser page. have set-up done on server side ( magento ), hit url , returned call page. same through program in android. i have tried below, consumer = new commonshttpoauthconsumer(key, secret); provider = new commonshttpoauthprovider(oauth_init_url,access_token_url, authorize_url); try { provider.retrieverequesttoken(consumer, oauth.out_of_band); log.d("tokens" , consumer.gettoken() + " -- " + consumer.gettokensecret()); } and request tokens. dont know how bypass next step. tried directly accessing accesstoken (stupid of me) provider.retrieveaccesstoken(consumer, "mycallback://callback"); no luck, ends in oauth.signpost.exception.oauthnotauthorizedexception: authorization failed (server replied 401). ...
Read more

org.mockito.exceptions.misusing.InvalidUseOfMatchersException: mockito -

getting error org.mockito.exceptions.misusing.invaliduseofmatchersexception: invalid use of argument matchers! 1 matchers expected, 2 recorded. exception may occur if matchers combined raw values: //incorrect: somemethod(anyobject(), "raw string"); when using matchers, arguments have provided matchers. example: //correct: somemethod(anyobject(), eq("string matcher")); at when( getprogramservice .callservice(any(getprogramtype.class))) .thenreturn(jaxbresponse); please explain error , possible resolution the code posted looks fine; don't see problem it. code before or above causing exception. key here: invalid use of argument matchers! 1 matchers expected, 2 recorded. any , used above, doesn't return "special kind of null" or "special kind of getprogramtype"; don't exist. instead, returns null , side effect puts matcher on stack. whe...
Read more

google shop client API returns 400 bad request error while adding an item -

i'm working on solution add items in google shopping market java application. following tutorial real mess because of missing classes of laste release, after setting 1.5-beta maven managed make base example typecheck correctly classes. still can make simple task of adding 1 item. instead of posting whole code i'm posting part creates product feed. private product createproduct(string id) { product product = new product(); product.title = "red wool sweater"; product.content = new content( "text", "comfortable , soft, sweater keep warm on " + "cold winter nights. red , blue stripes."); product.appcontrol = new appcontrol(); product.appcontrol.addrequireddestination("productads"); product.externalid = id; product.lang = "it"; product.country = "it"; product.condition = "nuovo"; product.price = new price("eu...
Read more