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Old 10-16-2009, 12:29 AM   #1
jeethu
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Registered: Oct 2009
Posts: 13

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Unhappy How to return values to C from shell if wput is success ?


hi i have a C function ( shown below) which calls a shell script.
A command in the shell script( wput) ( shown below) should return success if it is successfully sent file over the ftp network. adn the C file should make a entry in a new file (eg: sendinfo.txt) about the sent time. I want to know how the wput success is reported in the C ? that is how is the sent success returned to c ?


this is the C function which calls the script:
JNIEXPORT
void JNICALL
Java_DvrContact_gatherInfo( JNIEnv * env, jobject obj )
{
int i;
i=system("/home/srijith/DVR/main/dvr/gui/control/gather_upload_info"); printf("i=%d\n",i);
}

The C fuction is called by another openlazslo function. and this is the wput command in the script gather_upload_info :


.............................# scripts
...............................#scripts
.............................#scripts

/usr/bin/wput /var/tmp/$filename.tar.gz -t 1

............................#scripts
..........................#scripts


please mention the necessary changes in C and also in the script after the wput statements. I am already 5 days late on this part!
thnks in advance

Last edited by jeethu; 10-16-2009 at 05:18 AM.
 
Old 10-16-2009, 07:00 AM   #2
bartonski
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Registered: Jul 2006
Location: Louisville, KY
Distribution: Fedora 12, Slackware, Debian, Ubuntu Karmic, FreeBSD 7.1
Posts: 443
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wput should return 0 on success, and something non-zero on failure, i.e. the return value from wput as if run from the shell, and system() should pass that value as its return code.

Here's an example in action:

Code:
$ cat test.c; cc -o test test.c && ./test
#include <stdio.h>

int main(void) {
    printf("The return value of system( \"/bin/true\" ) is %d\n", system("/bin/true") );
    printf("The return value of system( \"/bin/false\" ) is %d\n", system("/bin/false") );
}
The return value of system( "/bin/true" ) is 0
The return value of system( "/bin/false" ) is 256
 
Old 10-16-2009, 07:04 AM   #3
bartonski
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Registered: Jul 2006
Location: Louisville, KY
Distribution: Fedora 12, Slackware, Debian, Ubuntu Karmic, FreeBSD 7.1
Posts: 443
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Rep: Reputation: 47
By the way, this would be better in the 'programming' forum.
 
  


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