view/branches/readpolicy.c

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

static void run_gc(void)
{
        fprintf(stderr, "Running GC.\n");
        close(open("/proc/ccs/profile", O_WRONLY));
        sleep(3);
}

static unsigned int read1(const int fd, unsigned int size)
{
        char c;
        unsigned int len = 0;
        while (size-- && read(fd, &c, 1) == 1 && write(1, "{", 1) == 1 &&
               write(1, &c, 1) == 1 && write(1, "}", 1) == 1)
                len++;
        return len;
}

static void write1(const int fd, const char *str)
{
        write(1, str, strlen(str));
        write(fd, str, strlen(str));
}

static inline void write2(const int fd, const char *str1, const char *str2)
{
        write1(fd, str1);
        write1(fd, str2);
}

int main(int argc, char *argv[])
{
        static const char *path1 = "/path/to/some/file/in/very/very/deep/"
                "location/which/will/surely/stop/within/this/pathname/"
                "while/reading/policy\n";
        static const char *path2 = "/path/to/other/file/in/very/very/deep/"
                "location/which/will/surely/stop/within/this/pathname/"
                "while/reading/policy\n";
        int fd1 = open("/proc/ccs/domain_policy", O_RDWR);
        int fd2 = open("/proc/ccs/domain_policy", O_RDWR);
        write1(fd1, "<kernel> /foo/bar /foo/bar/buz\n");
        write2(fd1, "file read/write/execute ", path1);
        write2(fd1, "file read/write/execute ", path2);
        write2(fd2, "select ", "<kernel> /foo/bar /foo/bar/buz\n");
        read1(fd2, 128);
        write1(fd1, "delete ");
        write2(fd1, "file read/write/execute ", path2);
        write1(fd1, "delete ");
        write2(fd1, "file read/write/execute ", path1);
        run_gc();
        write2(fd1, "delete ", "<kernel> /foo/bar /foo/bar/buz\n");
        run_gc();
        while (read1(fd2, 1) > 0);
        close(fd1);
        close(fd2);
        fd1 = open("/proc/ccs/exception_policy", O_RDWR);
        fd2 = open("/proc/ccs/exception_policy", O_RDWR);
        write2(fd1, "path_group VERY_VERY_LONG_PATH ", path1);
        write2(fd1, "path_group VERY_VERY_LONG_PATH ", path2);
        read1(fd2, 128);
        write1(fd1, "delete ");
        write2(fd1, "path_group VERY_VERY_LONG_PATH ", path1);
        write1(fd1, "delete ");
        write2(fd1, "path_group VERY_VERY_LONG_PATH ", path2);
        run_gc();
        while (read1(fd2, 1) > 0);
        close(fd1);
        close(fd2);
        return 0;
}