I was using built-in strace given in /system/xbin/ directory in the emulator and it was giving me wrong set of system calls such as msgget() and msgrcv() which are not supported by Android even.
I downloaded a new strace4.7 from Source Forge and tried to build with the instructions given at this link.
Published at LXer:
Having trouble figuring out why Apache isn't starting, or another program is crashing and burning, and the logfiles are giving no clue? Time to reach for strace. What's strace? The strace utility is used to run a command and display its system calls, so you can see exactly what the program is doing until it exits.
strace is a debugging command in Linux to monitor the system calls used by a program and all the signals it receives, similar to truss command in other Unix systems. The most common usage is to start a program using strace, which prints a list of system calls made by the program.
A couple things to check:- are your system clock and timezone right?- is your hostname right, and is /etc/hosts sane?- is your locale correct ("locale" command) and is that locale built on your system ("locale -a" command)?- did you change file permissions or ownerships somewhere you shouldn't have, and apps are frustrated trying to access something they can't?
#!/usr/bin/perl
use strict;
use warnings;
my $file;
my @files;
my $parse;
my @files = <*>;
foreach $file(@files)
chomp ($file);
{
$parse = system qq(paste <(cut -f1,2,13 $file) <(cut -f12 $file));
}
"my" variable @files masks earlier declaration in same scope at Rast_seq.pl line 11.
sh: 1: Syntax error: "(" unexpected
sh: 1: Syntax error: "(" unexpected
sh: 1: Syntax error: "("
Performed strace on one one of the apache children and its showing 24 seconds between two system calls.How can i determine what is the cause of this behavior.It looks like both children are taking almost same amound of time(24.7 and 23.92) seconds.
we are using apache prefork with php5 and mysql 5
/var/lib/php5/ is the php session folder
strace output of apache children1 with processid -20539
Ran into a weird situation I had not seen before while using strace -f command
I had to strace my 'passwd' command since I needed to debug something.
I am trying to create a simple .deb package by following a wonderful tutorial,
and my problem is that when I try to get the dependencies of the package by executing this command:
dpkg-depcheck -d ./configure
I get this error:
strace: ./configure: command not found
Running strace failed (command line:
strace -e trace=open,execve -f -q -o /tmp/depchqCdeiv ./configure
which I don't understand.
I'm currently fascinated by strace so, being new to it, I decided to play around a little. As suggested by the question title, I tried both strace su and strace ssh. Both commands displayed the password I typed in the strace output. su kept complaining of an incorrect password while ssh managed to log in normally.
My questions:
Is this a security flaw or am I missing something?
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