Re: Problem with fork inside a thread and system()
- From: Rainer Weikusat <rweikusat@xxxxxxxxxxx>
- Date: Fri, 28 Dec 2007 17:15:31 +0100
CMorgan <uestebanez@xxxxxxxxx> writes:
On 28 dic, 16:36, Rainer Weikusat <rweiku...@xxxxxxxxxxx> wrote:
CMorgan <uesteba...@xxxxxxxxx> writes:
I am experiencing an annoying problem withfork() andsystem()
In my program I need to launch the "pppd" from a thread, so, I create
a new process withforkand then in the child process I launch with
systemthepppdto connect an embeddedsystemto internet.
The problem is thatpppdfails.
Here is my example code:
int my_thread(...)
{
pid=fork();
if (pid==EAGAIN || pid==ENOMEM)
{
abort();
}
switch(pid)
{
case 0: // child
{
system("/usr/sbin/pppdcall gprs");
printf("Error execv:%s",strerror(errno));
exit(0);
}
break;
case -1:
abort();
break;
default: // father
father stuff.....
}
}
Independently (but maybe related to) of your problem:systemalready
forks & waits for you, meaning there is no reason to callsystemfrom
a forked processes, except insofar this means the process
callingsystemisn't halted until the command has exited. If you
don't want >> the latter, don't usesystem,
Ok I Have tryed with execv:
I just change the exec line for this one:
execv("/usr/sbin",macapi_gprs_ref->cmd_argv);
explanation:
"macapi_gprs_ref->cmd_argv" stores the parameters. I dumped it to my
log to check if parameters are right, and they are right.
Values of argv are:
parameter 0 = /usr/sbin/pppd
parameter 1 = call
parameter 2 = gprs
the result of execv is wrong:
"Error execv:Permission denied"
This is confusing, any hint?
The first argument to execv needs to be the file to be executed,
eg /usr/sbin/pppd.
.
- References:
- Problem with fork inside a thread and system()
- From: CMorgan
- Re: Problem with fork inside a thread and system()
- From: Rainer Weikusat
- Re: Problem with fork inside a thread and system()
- From: CMorgan
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