[ckrm-tech] tool

[Juan Villar]

Here's a tool to launch any command without adding its pid to the member
file of the group.

Simply type in a shell "./clauncher father/son command" and the pid of
command will be added to the file /config/res_groups/father/son/member

#include <stdio.h>
#include <string.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <unistd.h>

#define STATS_NAME_LENGTH 1024
#define RGCS "/config/res_groups"

extern char **environ;

void usage()
{
        printf("Usage: clauncher group1/group2/group3 command\n");
}

int main(int argc,char* argv[])
{
        pid_t pid;
        int i,status,nchar;
        char* command[argc-1],line[10];
        char members[STATS_NAME_LENGTH];
        FILE* f;

        if (argc < 3) {
                printf("Too few arguments\n\n");
                usage();
                return 1;
        }

        for (i=2;i<argc;i++) {
                command[i-2] = argv[i];
        }
        command[argc-2] = NULL;

        if (fork()) {
                wait(&status);
        } else {
                sprintf(members,"%s/%s/members",RGCS,argv[1]);

                f = fopen(members,"a");
                if (f == NULL) {
                        printf("can't open file: %s\n",members);
                        return 1;
                }

                sprintf(line,"%d",getpid());
                if (strlen(line) != fprintf(f,"%s",line)) {
                        printf("could not write to file: %s\n",members);
                        return 1;
                }

                if (fclose(f)) {
                        perror("can't close file");
                        return 1;
                }

                execvp(argv[2],command);
                perror(argv[2]);
        }
        return 0;
}


juanan



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