How to save the output of ifconfig command into a buffer? - vxworks

Question

I have to save the output of the command "ifconfig" into a char buffer using C++ and VxWorks.
How can I do it?

Answer 1

ifconfig is a shell command, so you should be able to redirect its output to a file using '>' and then read that file.
You can also have a look at the topic 'Redirecting Shell IO' in the manual.

Answer 2

Here is an example using pipe to save the output of ifconfig into a buffer.
Try -> pipe_test and -> puts &pipe_buf on the C interpreter shell. Good luck.
char pipe_buf[128*256];
int pipe_test()
{
char *pipe_name = "pipe01";
int pipe_fd;
int out_fd;
int nlines;
int nbytes;
if (pipeDevCreate(pipe_name,128,256) == ERROR) { /* 128 lines of size 256 bytes */
perror("pipeDevCreate");
return -1;
}
if ((pipe_fd = open(pipe_name,O_RDWR,0666)) < 0) {
pipeDevDelete(pipe_name,TRUE);
perror("open");
return -1;
}
out_fd = ioTaskStdGet(0,STD_OUT);
ioTaskStdSet(0,STD_OUT,pipe_fd);
ipcom_run_cmd("ifconfig -a");
ioTaskStdSet(0,STD_OUT,out_fd);
if (ioctl(pipe_fd, FIONMSGS, &nlines) == OK && nlines > 0) {
char *pbuf = &pipe_buf[0];
int ln;
memset(pipe_buf,0,sizeof(pipe_buf));
for (ln=0; ln<nlines && ln<128; ln++) {
nbytes = read(pipe_fd,pbuf,256);
pbuf += nbytes;
}
}
close(pipe_fd);
pipeDevDelete(pipe_name,TRUE);
return 0;
}