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Full Discussion: forking a new process
Top Forums Programming forking a new process Post 302077027 by blowtorch on Sunday 18th of June 2006 10:49:02 PM
Old 06-18-2006
Well, you can use execl, but in that case, you cannot use the $JAVAHOME env variable. You need to get the value from the env using something like getenv() and create the complete path.

The fork-exec part of the code can look like this (assuming that the path to the java command is /usr/jre/bin):
Code:
pid=fork();
if(pid==-1) {
   perror("error in fork!");
}
if(!pid) { /*child process - execute the java command*/
   execl("/usr/jre/bin/java","java","-cp","/opt/mv36/em/SMD/data/jct_005/SMD_LCT.jar:/opt/mv36/em/SMD/data/jct_005/jh.jar:/nms/JamToolsTest/jct/MV36CoreProxyNOP.1.1.jar","com.marcx.lct.sma11d.sma11d_lct_applet","-mv36","1","-host","19.3.11.13","-port","20020","-inifile","/opt/mv36/em/SMD/data/jct_005/","-lang","1","-laf","0","-msgset","5","-emaccess","3","-command","221",(char*)0)
}
else { /*in parent process - wait for child to exit*/
   wait();
}

 

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LEARN ABOUT OSF1

getpgid

getpgid(2)							System Calls Manual							getpgid(2)

NAME

       getpgid - Gets process group ID

LIBRARY

       Standard C Library (libc.a)

SYNOPSIS

       #include <sys/types.h>
       #include <unistd.h>
       pid_t getpgid(	   pid_t pid);

PARAMETERS

       Specifies the process ID of the target process; zero implies the calling process.

DESCRIPTION

       The  getpgid()  function returns the process group ID of the process specified by the process ID pid.  Specifying a pid of 0 (zero) returns
       the process group ID of the calling process.

RETURN VALUES

       The getpgid() function returns the process group ID of the process specified.  If there was an error, a value of -1 is returned	and  errno
       is set to indicate the error.

ERRORS

       If  any	of  the following conditions occurs, the getpgid() function sets errno to the corresponding value: The specified process is not in
       the same session as the calling process, and the calling process lacks sufficient privilege to read the specified  process.   As  released,
       Tru64 UNIX does not check the privilege.  No process has been found that has a process ID identical to that specified by the pid parameter.

RELATED INFORMATION

       Functions: exec(2), fork(2), setpgid(2) delim off

																	getpgid(2)
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