pthread and recursively calling execvp in C
- by eduke
To begin I'm sorry for my english :)
I looking for a way to create a thread each time my program finds a directory, in order to call the program itself but with a new argv[2] argument (which is the current dir). I did it successfully with fork() but with pthread I've some difficulties. I don't know if I can do something like that :
#include <unistd.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/wait.h>
#include <dirent.h>
int main(int argc, char **argv)
{
pthread_t threadID[10] = {0};
DIR * dir;
struct dirent * entry;
struct stat status;
pthread_attr_t attr;
pthread_attr_init(&attr);
int i = 0;
char *res;
char *tmp;
char *file;
if(argc != 3)
{
printf("Usage : %s <file> <dir>\n", argv[0]);
exit(EXIT_FAILURE);
}
if(stat(argv[2],&status) == 0)
{
dir = opendir(argv[2]);
file = argv[1];
}
else
exit(EXIT_FAILURE);
while ((entry = readdir(dir)))
{
if (strcmp(entry->d_name, ".") && strcmp(entry->d_name, ".."))
{
tmp = malloc(strlen(argv[2]) + strlen(entry->d_name) + 2);
strcpy(tmp, argv[2]);
strcat(tmp, "/");
strcat(tmp, entry->d_name);
stat(tmp, &status);
if (S_ISDIR(status.st_mode))
{
argv[2] = tmp;
pthread_create( &threadID[i], &attr, execvp(argv[0], argv), NULL);
printf("New thread created : %d", i);
i++;
}
else if (!strcmp(entry->d_name, file))
{
printf(" %s was found - Thread number = %d\n",tmp, i);
break;
}
free(tmp);
}
}
pthread_join( threadID[i] , &res );
exit(EXIT_SUCCESS);
}
Actually it doesn't works :
pthread_create( &threadID[i], &attr, execvp(argv[0], argv), NULL);
I have no runtime error, but when the file to find is in another directory, the thread is not created and so execvp(argv[0], argv) is not called...
Thank you for you help,
Simon
