I'm having problems trying to execute a process using fork()
and execvp()
. I have a struct Pcb
which has an array of arguments ( args
):
#define MAXARGS 2
struct pcb {
pid_t pid; // system process ID
char *args[MAXARGS]; // program name and args
int arrivaltime;
int remainingcputime;
struct pcb * next; // links for Pcb handlers
int priority, memalloc, res1, res2, res3, res4, status;
};
typedef struct pcb Pcb;
typedef Pcb * PcbPtr;
the first of which is the name of the program to be executed.
And this is my fork function
PcbPtr startPcb(PcbPtr process) {
int pid;
switch (pid=fork()) {
case -1:
return NULL;
case 0:
execvp(process->args[0], process->args);
default:
return process;
}
process->status = 2;
return process;
}
Note: process->args[0]
is just a const string called "process" which refers to a compiled program called 'process' in the current directory.
There are no arguments.
When I use gdb and follow the child process its just says:
[New process 15186]
[Switching to process 15186]
13 execvp(process->args[0], process->args);
(gdb)
Program received signal SIGTSTP, Stopped (user).
startPcb (process=0x602250) at util.c:13
13 execvp(process->args[0], process->args);
(gdb)
Why is it receiving SIGSTP?
原来我没有在args [0]中指定完整路径
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