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Full Discussion: System call failed with 127 .. after 500 times when called in loop
Top Forums UNIX for Advanced & Expert Users System call failed with 127 .. after 500 times when called in loop Post 302588412 by binnyjeshan on Monday 9th of January 2012 01:27:36 AM
Old 01-09-2012
System call failed with 127 .. after 500 times when called in loop
Hi Experts,

I have a code like this.

=====
Code:
#include.... 

int main()
{ 
  int count = 0;
  while(1){
    
    printf("\n Interation number is: %d \n ",count);
    rv = system(" test.sh > log.txt " );

    if (-1 == rv)
    {
        printf("Could not generate static log: error calling system()");
    }
    else if (WEXITSTATUS(rv) != 0)
    {
        printf("\nProblem generating static log: shell script returned %d \n", WEXITSTATUS(rv) );
        
    }
     count ++;
    .
    .
    .
    //some other code comes here
    .
    .

  } //while ends
}

Content of the test.sh is.
Code:
#!/bin/sh

echo "HIIIII"
ls -lrt
ps -ef

Problem is that, after this code is looped for 500+ times, the error happens
Problem generating static log: shell script returned 127

In the meantime when the error is happening, if you execure this manually on the shell, i.e. test.pl > log.txt .. it works fine..
ONLY WHEN IT HAPPENS THROUGH SYSTEM CALL, it fails

after failing for 30 times, it resumes again successfully.

I have tried to replace system() with popen(), but that also gives same behavior.

What would be the reason? Is it that the fork() ed child processes by these two functions (internally) did not free the resources?
did /bin/sh fail to launch? Did the system have no memory to fork?(if so, why did it resume after 30 continuous failures?

I am looking for your suggestions and comments.

Thanks for the help and your time,
Binny Jeshan,
Senior Software Designer,
Aricent.
Last edited by binnyjeshan; 01-20-2012 at 03:04 AM.. Reason: typing error rectified; please use code tags
 

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LEARN ABOUT DEBIAN

doveadm-log

DOVEADM-LOG(1)							      Dovecot							    DOVEADM-LOG(1)

NAME

       doveadm-log - Locate, test or reopen Dovecot's log files

SYNOPSIS

       doveadm [-Dv] log errors
       doveadm [-Dv] log find [directory]
       doveadm [-Dv] log reopen
       doveadm [-Dv] log test

DESCRIPTION

       The  doveadm  log commands are used to locate and reopen the log files of dovecot(1).  It's also possible to test the configured targets of
       the *log_path settings.

OPTIONS

       Global doveadm(1) options:

       -D     Enables verbosity and debug messages.

       -v     Enables verbosity, including progress counter.

COMMANDS

   log errors
       doveadm log errors

       The log errors command is used to show the last	- up to 1,000 - errors and warnings.  If no output is generated, no errors  have  occurred
       since the last start.

   log find
       doveadm log find [directory]

       The  log  find  command	is used to show the location of the log files, to which dovecot(1) sends its log messages.  If dovecot(1) logs its
       messages through syslogd(8) and doveadm(1) could not find any log files, you can specify the directory where your syslogd  writes  its  log
       files.

   log reopen
       doveadm log reopen

       This command causes doveadm to reopen all log files, configured in the log_path, info_log_path and debug_log_path settings.  These settings
       are configured in /etc/dovecot/conf.d/10-logging.conf.
       This is for example useful after manually rotating the log files.

   log test
       doveadm log test

       This command causes doveadm to write the message "This is Dovecot's priority log (timestamp)" to the configured log files.  The used prior-
       ities are: debug, info, warning, error and fatal.

EXAMPLE

       This example shows how to locate the log files used by dovecot(1).

       doveadm log find
       Looking for log files from /var/log
       Debug: /var/log/dovecot.debug
       Info: /var/log/mail.log
       Warning: /var/log/mail.log
       Error: /var/log/mail.log
       Fatal: /var/log/mail.log

REPORTING BUGS

       Report  bugs,  including doveconf -n output, to the Dovecot Mailing List <dovecot@dovecot.org>.	Information about reporting bugs is avail-
       able at: http://dovecot.org/bugreport.html

SEE ALSO

       doveadm(1)

Dovecot v2.1							    2012-02-22							    DOVEADM-LOG(1)
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