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我把示例程序從Advanced Linux Programming網站：分叉和執行程序不會返回到控制檯
/***********************************************************************
* Code listing from "Advanced Linux Programming," by CodeSourcery LLC *
* Copyright (C) 2001 by New Riders Publishing *
* See COPYRIGHT for license information. *
***********************************************************************/
#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
#include <unistd.h>
/* Spawn a child process running a new program. PROGRAM is the name
of the program to run; the path will be searched for this program.
ARG_LIST is a NULL-terminated list of character strings to be
passed as the program's argument list. Returns the process id of
the spawned process. */
int spawn (char* program, char** arg_list)
{
pid_t child_pid;
/* Duplicate this process. */
child_pid = fork();
if (child_pid != 0)
/* This is the parent process. */
return child_pid;
else {
/* Now execute PROGRAM, searching for it in the path. */
execvp (program, arg_list);
/* The execvp function returns only if an error occurs. */
fprintf (stderr, "an error occurred in execvp\n");
abort();
}
}
int main()
{
/* The argument list to pass to the "ls" command. */
char* arg_list[] = {
"ls", /* argv[0], the name of the program. */
"-l",
"/",
NULL /* The argument list must end with a NULL. */
};
/* Spawn a child process running the "ls" command. Ignore the
returned child process id. */
spawn ("ls", arg_list);
printf ("done with main program\n");
return 0;
}
編譯和從控制檯運行它之後，子進程不會退出，因此不會釋放安慰。
只有Ctrl + C有助於返回控制檯。
[email protected] ~/Projects/test $ gcc -o test test.c
[email protected] ~/Projects/test $ ./test
done with main program
[email protected] ~/Projects/test $ total 104
drwxr-xr-x 2 root root 4096 Mar 11 11:57 bin
drwxr-xr-x 3 root root 4096 Mar 11 11:57 boot
[ ... too many lines of my filesystem skipped ... ]
drwxr-xr-x 10 root root 4096 Nov 27 01:12 usr
drwxr-xr-x 11 root root 4096 Nov 27 01:48 var
^C
[email protected] ~/Projects/test $
如何運行另一程序並退出到控制檯？