On 07Feb2008 13:23, sajid_mirani <[EMAIL PROTECTED]> wrote:
| how can we use a fork function ? can you gave a simple example of this
| function ?
pid_t = fork();
if (pid < 0)
/* fork() failed - report error and cancel actions */
else if (pid == 0)
/* we are the new child process - getpid() can
* be used to find out our own process id
*/
else
/* we are the original, parent process
* pid == what getpid() in the child would tell the child
*/
Normal "run a program" approach would look a little bit like this:
pid_t pid = fork();
if (pid == 0)
/* child */
execvp(... the new executable and arguments ...)
else if (pid > 0)
/* parent */
wait(); /* wait for the child to exit */
This is greatly simplified. A real program will do much more than this,
with proper error checking and handling. See the manual entries for
details.
| After the fork function, if we change the values of some
| global variables in the child function, then the values of the
| variables changed in the parent function or not ?
| in the same way if we change values in parent funtion then it will
| change in child or not ?
"Not", in both cases.
--
Cameron Simpson <[EMAIL PROTECTED]> DoD#743
http://www.cskk.ezoshosting.com/cs/
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