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

jeethu · 10-16-2009, 12:29 AM

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

bartonski · 10-16-2009, 07:00 AM

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

bartonski · 10-16-2009, 07:04 AM

By the way, this would be better in the 'programming' forum.