c - waitpid - WIFEXITED returning 0 although child exited normally -


I am writing a program that gives birth to the hair process, and call waitpid The waiting code for the child process is below: 

  // fork & amp; Exec to child pid_t pid = fork (); If (pid == -1) // Here is the error handling code ** ** ** triggered if (! Pid) {// binary_invocation is an array of child process program and its argument execv (args.binary_invocation [0], (four * const *) args.binary_invocation); // Here is some error handling code that is not ** ** triggered} and {int condition = 0; Pid_t res = waitpid (pid, and position, 0); // Here I see that pid_t is a positive integer & gt; Meaning of 0 and position 11, which means WIFEXITED (position) is 0. // It triggers a warning in my program output. } The value of   
  waitpid  page  WIFEXITED :  
  returns the right for WIFEXITED (status) If the child ends normally, then by calling the exit (3) or _ext (2), or returning to the main ().   
 Which means that I want to return an integer! = 0 on success, which is not happening in the execution of my program, because I follow  WIFEXITED == 0   
 However, from the command line only Is the program executing results in  $? == 0 , and starts with the results of GDB:  
  [inferior 1 (process 31934) normally passed)   
 The program normally behaves except for the trigger warning, from which I think that something else is going on here, I am missing.  
  Edit:  
 Recommended below in comments, if the child is terminated by the default, and in fact,  WifiSglad (status)  1 returns, and  WTERMSIG (status)  return 11, which is the  SIGSEGV .  
 I do not understand, this is the reason why a call will be unsuccessful with a Segfault via execution, while the same call through GDB, or a shell will be successful?  
  ADIT 2:  
 The behavior of my application is very much dependent on the behavior of hair procedure, especially in a file to the child  __feed__ (district) In the declared function, .  waitpid  after the call return,  this file exists and is produced correctly  which means that in some other district I would be out of my control somewhere else is.   returned > > 
 
 
 or  wait for  on UNIX and Linux systems  = "text"> 
 (or any other  wait  of the variants) is the structure:  
  bits 0-6 signal number which means that The reason for the baby to get out, or 0177 if the child is closed or if the child gets out without a signal 7 1 If the core is dumped, the other 0 8-15 is less than 8 beet value Price has been passed to explore / extract or returned by the main, or to stop / release / continue the child due to that signal   
 (Note that Positrix bits Does not define, only macros, but at least Linux, Mac OS X / IOS and Solaris are the bit definitions used by. Keep in mind that  waitpid  if you want it to be  WUNTRACED  Flag and its If you pass A, then returns returns for stop events only if you pass it to the  WCONTINUED  flag, then the event events.) 11 means that the child came out due to 11 signals, which is  SIGSEGV  is still, rather than Pausix, traditionally).  
 Either your program is giving invalid arguments to  execv  (which is a C library cover or some other around  execve ) kernel-specific Call), or when you run  execv  and when you run it with a shell or a GDB, the child runs differently.  
 If you are on a system that is generating  stress ,  execv  sign,  strace -f .

Comments

Post a Comment

Popular posts from this blog

Java - Error: no suitable method found for add(int, java.lang.String) -

I'm in the middle of homework work and I'm stuck. At this point in my code, I think that I should have a GUI window that opens and allows me to type "inserted text number". Notice is not going anywhere but at this point, If I pass through the problem then it will be in a linked list. I am getting two of the same error for the lines. Add (index, element); And I can not seem to get past it, there is no suitable method for the error "add (int, java. string string)". Code is below, please advise. To clarify - this will not be a method error because it is a linked list. There should not be any way involved. import java.awt. *; Import java.awt.event. *; Import javax.swing. *; Import java.util. *; Import java.util.Scanner; Import java.util.LinkedList; Public class TopTenList JFrame {Private TopTenList tt; See the Private JTextArea list; Private JTextField cmdTextField; Private JTextField resultsTestfield; // This GUI window is the code for the public toptist...
Read more

java - JPA TypedQuery: Parameter value element did not match expected type -

I am using JPA 2.0 and getting the following code in the DAO layer: Public Zero Test () {string key = "status"; String [] Conditions = {"A", "B"}; & Lt; TestTable & gt; Results = Search (Keys, Conditions); } Public listing & lt; TestTable & gt; Search (string key, object value error) {string sql = "test ndf to testlet and jade nand." + Key + "in:" + key; TypedQuery & LT; TestTable & gt; Query = entityManager.createQuery (SQL, TestTable.class); Query.setParameter (key, Arrays.asList (valueArr)) / *** Error Line *** Return query.getResultList (); } In the above error line, it throws the following exception: java.lang.IllegalArgumentException: parameter value element [[Ljava.lang.String; @ cbe5bc] did not match the expected type [java.lang.String] Why is this expected type string while actually this string []? Please help! Note: This is derived from the normal routine and is a simplified code. I can no...
Read more

c++ - static template member variable has internal linkage but is not defined -

Yes, I know, there is a question with almost the same title, but it refers to a different situation. Error message) In my case, I have a .cpp file with a big named designation name (implementation details). There is a property class template with a static data member in that name space, which I need to access from outside the unknown namespace. I give it a little bit of meat: file.hpp namespace Bar {template & lt; Typename A & gt; Struct foo {static_assert (is_same & lt; a, float & gt; :: value} is_same & lt; a, double>: value, ""); Fixed zero set_static_var (a const & x); // ...}; } and file.cpp namespace {template & lt; Typename A & gt; Struct foo_traits {// supports the implementation of several static code bars: foo & lt; & Gt; Fixed A data; }; The template's & lt; & Gt; Float foo_traits & lt; Float & gt; :: datum; // No change if this is in the global namespace template & lt; & Gt; Doub...
Read more