127: Killed via interrupt. Highest possible return code.
Anything else can mean whatever error you want it to mean. Some specific programs might have a traditional meaning for certain codes, but since audioscope is not any of those specific traditional programs, it doesn't matter.
By convention, there are five classes of exit codes:
The standards require the 0 exit status to mean successful termination for most standard utilities. And they require 126 and 127 as described above for the command, env, nice, nohup, time, and xargs utilities. A process killed by a signal will exit with the above mentioned exit status, but there is nothing that keeps a process from exiting with an exit code greater than 128 (up to 255) even if it was not terminated by a signal.
On UNIX systems, a process killed by a SIGTERM signal would exit with exit code 143 and a process killed by a SIGKILL signal would exit with exit code 137. On other systems, the standards do not specify the signal numbers assigned to the various signals defined by the standards.
As always, there are exceptions to these conventions. (For example, the false utility's successful exit code is an unspecified non-zero value; not 0.)
When searching for new posts, I see that my voting in one of the polls counts as a 'new post'. However, while the '<blah> minutes ago' entry updates correctly, the 'by <username>' is the last user to actually post a comment in the poll instead.
Result:
Poll: vB Guest Book 39... (4 Replies)
Hello,
basically what this script is supposed to do is showing a list of hosts that is given a number, that you will be able to choose from a list.
A check is made to verify that the chosen number is within the array and this is where things go bad and I don't know why, bizarre.
I've spent... (5 Replies)
foreach x ( *.foo)
echo "move file?"
set move=$<
if($move == y) then
echo "enter new pathname:"
set path=$<
mv $x $path/$x
endif
end
ok guys, im creating this script so i can move files with *.foo extensions and *.bar... (6 Replies)
I downloaded and installed "Cygwin yesterday onto my PC running Windows XP. When I tried to type "vi" in Cygwin's window, I got the following message bash: vi: Command not found
What shud i do inorder to get into vi editor
Thanks (10 Replies)
# check host value regex='^(||1|2|25)(\.(||1|2|25)){3}$' if ')" != "" ]; then if ]; then echo host $host not found exit 4 fi elif ]; then echo $host is an invalid host address exit 5 fi
espeacailly the top regex part?
---------- Post updated at 06:58 PM ---------- Previous update was... (1 Reply)
I am wondering if someone can help me out. I am new to oracle and given a task to install Oracle 11g on Solaris. I am running into some major problems since last week since I can't seem to get it to work.
I can't start GUI, tried different blogs but no luck. Then, I decided to install it in a... (4 Replies)
Boy oh boy, with only a MONO mic input to use AudioScope gets much more difficult when the ALTDC board is included.
It needs, so far, two hits at the MIC input with a single hit at the HEADPHONE audio output.
The first at the highest practical resolution for the AC component and the second... (0 Replies)
AudioScope Project.
(Apologies for any typos.)
For the few following......
AudioScope.sh...
Now at Version 0.60.00.
Well this baby has come a long way since its inception in January 2013. It is now at Version 0.60.00. It is MUCH more Apple centric now with a new OSX Sierra minimum _silent_... (7 Replies)
Discussion started by: wisecracker
7 Replies
LEARN ABOUT REDHAT
system
SYSTEM(3) Linux Programmer's Manual SYSTEM(3)NAME
system - execute a shell command
SYNOPSIS
#include <stdlib.h>
int system(const char *string);
DESCRIPTION
system() executes a command specified in string by calling /bin/sh -c string, and returns after the command has been completed. During
execution of the command, SIGCHLD will be blocked, and SIGINT and SIGQUIT will be ignored.
RETURN VALUE
The value returned is -1 on error (e.g. fork failed), and the return status of the command otherwise. This latter return status is in the
format specified in wait(2). Thus, the exit code of the command will be WEXITSTATUS(status). In case /bin/sh could not be executed, the
exit status will be that of a command that does exit(127).
If the value of string is NULL, system() returns nonzero if the shell is available, and zero if not.
system() does not affect the wait status of any other children.
CONFORMING TO
ANSI C, POSIX.2, BSD 4.3
NOTES
As mentioned, system() ignores SIGINT and SIGQUIT. This may make programs that call it from a loop uninterruptable, unless they take care
themselves to check the exit status of the child. E.g.
while(something) {
int ret = system("foo");
if (WIFSIGNALED(ret) &&
(WTERMSIG(ret) == SIGINT || WTERMSIG(ret) == SIGQUIT))
break;
}
Do not use system() from a program with suid or sgid privileges, because strange values for some environment variables might be used to
subvert system integrity. Use the exec(3) family of functions instead, but not execlp(3) or execvp(3). system() will not, in fact, work
properly from programs with suid or sgid privileges on systems on which /bin/sh is bash version 2, since bash 2 drops privileges on
startup. (Debian uses a modified bash which does not do this when invoked as sh.)
The check for the availability of /bin/sh is not actually performed; it is always assumed to be available. ISO C specifies the check, but
POSIX.2 specifies that the return shall always be non-zero, since a system without the shell is not conforming, and it is this that is
implemented.
It is possible for the shell command to return 127, so that code is not a sure indication that the execve() call failed.
SEE ALSO sh(1), signal(2), wait(2), exec(3)
2001-09-23 SYSTEM(3)