| Title |
Remotely spawning QNX apps and Photon applications |
| Ref. No. |
QNX.000000980 |
| Category(ies) |
Development |
| Issue |
Is there a way to spawn QNX and Photon applicationss remotely from one machine to another? Then, turn off the local machine, and have the application still run on the other machine?
|
| Solution |
The following is an example for remote spawning of a QNX application:
#include <unistd.h>
#include <string.h>
#include <stdlib.h>
#include <stdio.h>
#include <signal.h>
#include <process.h>
#include <fcntl.h>
#include <ctype.h>
#include <sys/prfx.h>
#include <sys/qnx_glob.h>
#include <sys/wait.h>
#include <sys/vc.h>
#include <dirent.h>
#define qso qnx_spawn_options
void main(int argc, char **argv)
{
int overlay = P_OVERLAY;
char buffer[8] = "//";
int status;
int ch, i;
char dir[80];
char *ph_argv[4];
char phapp[80];
char suffix[20];
DIR *dirp;
struct dirent *direntp;
pid_t pid;
if (argc != 3)
{
fprintf(stderr,"Use:onq node QnxApp");
exit (1);
}
qso.flags |= _SPAWN_NOZOMBIE; /* remote */
qso.node = qnx_strtonid(argv[1], 0);
if (qso.node == -1 || qso.node == 0) {
fprintf(stderr, "invalid node");
exit(3);
} else if (qso.node != getnid())
overlay = P_NOWAIT;
strcat(buffer, argv[1]);
strcat(buffer, "/");
qnx_prefix_setroot(buffer);
if(!(strcmp(argv[0], "onq") ) )
{ // QNX terminal mode - use /node/dev/con
// this will use first free console
strcat(buffer, "dev/con");
close(0);
if (open(buffer, O_RDWR) <0) {
fprintf(stderr, "error opening /dev/con - probably no free consoles ");
exit(4);
}
dup2(qso.ctfd = 0, 1), dup2(1, 2);
qso.flags |= _SPAWN_SETSID | _SPAWN_TCSETPGRP;
overlay = P_NOWAIT;
argv += 2;
if ((status = spawnvp (overlay, *argv, argv)) == -1)
fprintf(stderr,"Spawn fail:%s",errno);
else if ((qso.flags&_SPAWN_SETSID)==0) {
signal(SIGINT, SIG_IGN), signal(SIGQUIT, SIG_IGN);
close(0), close(1), close(2), fcloseall();
}
exit(0);
}
}
And here is the code to do the same thing for a Photon application:
/* Standard headers */
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <sys/vc.h>
#include <sys/name.h>
#include <sys/kernel.h>
/* Extra headers */
#include <fcntl.h>
#include <process.h>
#include <sys/qnx_glob.h>
void main(int argc, char **argv)
{
char dir[80];
char *myargv[4];
char suffix[20];
pid_t pid;
nid_t rnid;
int fd;
/* Get the entered Node Number */
rnid = qnx_strtonid(argv[1], 0);
/* Look for Photon */
strcpy(dir, "//");
strcat(dir, argv[1]);
strcat(dir, "/dev/photon");
fd = open(dir, O_RDONLY);
if(fd != -1)
{
myargv[0] = "/usr/photon/bin/pterm";
strcpy(suffix, "-s//");
strcat(suffix, argv[1]);
strcat(suffix, "/dev/photon");
myargv[1] = suffix; // Photon server
myargv[2] = NULL;
// "-s" works for all PhAB apps - attach to
//specified Photon server */
strcpy(dir, "//");
strcat(dir, argv[1]);
strcat(dir, "/");
qnx_prefix_setroot(dir);
pid = qnx_spawn( 0, 0, rnid, -1, -1, 0, myargv[0], myargv, environ, NULL, -1);
if ( pid <0 )
perror("spawn");
}
close(fd);
return;
} |
|
