view/branches/transit3_demo.c

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

static void show_self_domain(void)
{
        FILE *fp = fopen("/proc/ccs/self_domain", "r");
        char buffer[8192];
        memset(buffer, 0, sizeof(buffer));
        fgets(buffer, sizeof(buffer) - 1, fp);
        puts(buffer);
        fclose(fp);
}

int main(int argc, char *argv[]) {
        char *cp;
        const int fd = open("/proc/ccs/.transition", O_WRONLY);
        if (fd == EOF)
                return 1;
        show_self_domain();
        cp = "transit domain test";
        write(fd, cp, strlen(cp) + 1);
        show_self_domain();
        cp = "transit domain test again";
        write(fd, cp, strlen(cp) + 1);
        show_self_domain();
        close(fd);
        return 0;
}