/* * Copyright 2011 Kirk J. Russell * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ #include #include #include #include #include #include #include #include #include #include static char * bstg_pathstore[] = { "/mnt/111/z", "/mnt/111/aaaa", "/mnt/111/bbbbb", "/mnt/111/ccccc", "/mnt/111/d", "/mnt/111/e", "/mnt/111/ffffff.fff.f", "/mnt/111/gggggggggggg", "/mnt/111/hhhh", "/mnt/111/iiiii.ii", "/mnt/111/jjjj.jj.jjjjjjjj", "/mnt/111/kkkk.kkkkkkkk", "/mnt/111/lllll", "/mnt/222/z", "/mnt/222/aaaa", "/mnt/222/bbbbb", "/mnt/222/ccccc", "/mnt/222/d", "/mnt/222/e", "/mnt/222/ffffff.fff.f", "/mnt/222/gggggggggggg", "/mnt/222/hhhh", "/mnt/222/iiiii.ii", "/mnt/222/jjjj.jj.jjjjjjjj", "/mnt/222/kkkk.kkkkkkkk", "/mnt/222/lllll", "/mnt/333/z", "/mnt/333/aaaa", "/mnt/333/bbbbb", "/mnt/333/ccccc", "/mnt/333/d", "/mnt/333/e", "/mnt/333/ffffff.fff.f", "/mnt/333/gggggggggggg", "/mnt/333/hhhh", "/mnt/333/iiiii.ii", "/mnt/333/jjjj.jj.jjjjjjjj", "/mnt/333/kkkk.kkkkkkkk", "/mnt/333/lllll", "/mnt/444/z", "/mnt/444/aaaa", "/mnt/444/bbbbb", "/mnt/444/ccccc", "/mnt/444/d", "/mnt/444/e", "/mnt/444/ffffff.fff.f", "/mnt/444/gggggggggggg", "/mnt/444/hhhh", "/mnt/444/iiiii.ii", "/mnt/444/jjjj.jj.jjjjjjjj", "/mnt/444/kkkk.kkkkkkkk", "/mnt/444/lllll", "/mnt/555/z", "/mnt/555/aaaa", "/mnt/555/bbbbb", "/mnt/555/ccccc", "/mnt/555/d", "/mnt/555/e", "/mnt/555/ffffff.fff.f", "/mnt/555/gggggggggggg", "/mnt/555/hhhh", "/mnt/555/iiiii.ii", "/mnt/555/jjjj.jj.jjjjjjjj", "/mnt/555/kkkk.kkkkkkkk", "/mnt/555/lllll", "/mnt/666/z", "/mnt/666/aaaa", "/mnt/666/bbbbb", "/mnt/666/ccccc", "/mnt/666/d", "/mnt/666/e", "/mnt/666/ffffff.fff.f", "/mnt/666/gggggggggggg", "/mnt/666/hhhh", "/mnt/666/iiiii.ii", "/mnt/666/jjjj.jj.jjjjjjjj", "/mnt/666/kkkk.kkkkkkkk", "/mnt/666/lllll", "/mnt/777/z", "/mnt/777/aaaa", "/mnt/777/bbbbb", "/mnt/777/ccccc", "/mnt/777/d", "/mnt/777/e", "/mnt/777/ffffff.fff.f", "/mnt/777/gggggggggggg", "/mnt/777/hhhh", "/mnt/777/iiiii.ii", "/mnt/777/jjjj.jj.jjjjjjjj", "/mnt/777/kkkk.kkkkkkkk", "/mnt/777/lllll", "/mnt/888/z", "/mnt/888/aaaa", "/mnt/888/bbbbb", "/mnt/888/ccccc", "/mnt/888/d", "/mnt/888/e", "/mnt/888/ffffff.fff.f", "/mnt/888/gggggggggggg", "/mnt/888/hhhh", "/mnt/888/iiiii.ii", "/mnt/888/jjjj.jj.jjjjjjjj", "/mnt/888/kkkk.kkkkkkkk", "/mnt/888/lllll", "/mnt/999/z", "/mnt/999/aaaa", "/mnt/999/bbbbb", "/mnt/999/ccccc", "/mnt/999/d", "/mnt/999/e", "/mnt/999/ffffff.fff.f", "/mnt/999/gggggggggggg", "/mnt/999/hhhh", "/mnt/999/iiiii.ii", "/mnt/999/jjjj.jj.jjjjjjjj", "/mnt/999/kkkk.kkkkkkkk", "/mnt/999/lllll", "/mnt/aaa/z", "/mnt/aaa/aaaa", "/mnt/aaa/bbbbb", "/mnt/aaa/ccccc", "/mnt/aaa/d", "/mnt/aaa/e", "/mnt/aaa/ffffff.fff.f", "/mnt/aaa/gggggggggggg", "/mnt/aaa/hhhh", "/mnt/aaa/iiiii.ii", "/mnt/aaa/jjjj.jj.jjjjjjjj", "/mnt/aaa/kkkk.kkkkkkkk", "/mnt/aaa/lllll", "/mnt/bbb/z", "/mnt/bbb/aaaa", "/mnt/bbb/bbbbb", "/mnt/bbb/ccccc", "/mnt/bbb/d", "/mnt/bbb/e", "/mnt/bbb/ffffff.fff.f", "/mnt/bbb/gggggggggggg", "/mnt/bbb/hhhh", "/mnt/bbb/iiiii.ii", "/mnt/bbb/jjjj.jj.jjjjjjjj", "/mnt/bbb/kkkk.kkkkkkkk", "/mnt/bbb/lllll", "/mnt/ccc/z", "/mnt/ccc/aaaa", "/mnt/ccc/bbbbb", "/mnt/ccc/ccccc", "/mnt/ccc/d", "/mnt/ccc/e", "/mnt/ccc/ffffff.fff.f", "/mnt/ccc/gggggggggggg", "/mnt/ccc/hhhh", "/mnt/ccc/iiiii.ii", "/mnt/ccc/jjjj.jj.jjjjjjjj", "/mnt/ccc/kkkk.kkkkkkkk", "/mnt/ccc/lllll", "/mnt/ddd/z", "/mnt/ddd/aaaa", "/mnt/ddd/bbbbb", "/mnt/ddd/ccccc", "/mnt/ddd/d", "/mnt/ddd/e", "/mnt/ddd/ffffff.fff.f", "/mnt/ddd/gggggggggggg", "/mnt/ddd/hhhh", "/mnt/ddd/iiiii.ii", "/mnt/ddd/jjjj.jj.jjjjjjjj", "/mnt/ddd/kkkk.kkkkkkkk", "/mnt/ddd/lllll", "/mnt/eee/z", "/mnt/eee/aaaa", "/mnt/eee/bbbbb", "/mnt/eee/ccccc", "/mnt/eee/d", "/mnt/eee/e", "/mnt/eee/ffffff.fff.f", "/mnt/eee/gggggggggggg", "/mnt/eee/hhhh", "/mnt/eee/iiiii.ii", "/mnt/eee/jjjj.jj.jjjjjjjj", "/mnt/eee/kkkk.kkkkkkkk", "/mnt/eee/lllll", "/mnt/fff/z", "/mnt/fff/aaaa", "/mnt/fff/bbbbb", "/mnt/fff/ccccc", "/mnt/fff/d", "/mnt/fff/e", "/mnt/fff/ffffff.fff.f", "/mnt/fff/gggggggggggg", "/mnt/fff/hhhh", "/mnt/fff/iiiii.ii", "/mnt/fff/jjjj.jj.jjjjjjjj", "/mnt/fff/kkkk.kkkkkkkk", "/mnt/fff/lllll" }; char * bstg_pathstore_get() { return bstg_pathstore[rand() % ((sizeof(bstg_pathstore)/sizeof(bstg_pathstore[0])))]; } void dogcore() { pid_t sleepchild, gcorechild; extern char **environ; /* create a child for the gcore target */ if ((sleepchild = fork()) == 0) { sleep(30); _exit(1); } else if (sleepchild > 0) { char *token[] = { NULL, NULL, NULL, NULL, NULL }; char buf[64]; int status; /* use the first process as the target */ snprintf(buf, sizeof(buf), "%d", sleepchild); token[0] = "gcore"; token[1] = "-c"; token[2] = bstg_pathstore_get(); token[3] = buf; assert(token[4] == NULL); if ((gcorechild = fork()) > 0) { waitpid(gcorechild, &status, 0); } else if (gcorechild == 0) { execve("/usr/bin/gcore", token, environ); _exit(1); } kill(sleepchild, SIGKILL); waitpid(sleepchild, &status, 0); } } void dowrite() { struct iovec data[] = { { "12", 2 }, { NULL, 0 }, { "12345678", 8}, }; static int fd = -1; if (fd == -1) { /* keep existing file open during life of this process */ fd = open(bstg_pathstore_get(), O_RDWR|O_NONBLOCK|O_NOCTTY); } data[1].iov_base = bstg_pathstore_get(); data[1].iov_len = strlen((char*)data[1].iov_base); ftruncate(fd, 0); pwritev(fd, data, 3, 0); } void dounlink() { unlink(bstg_pathstore_get()); } void dolink() { link(bstg_pathstore_get(), bstg_pathstore_get()); } void domkdir() { char **pdir; static char * bstg_dirs[] = { "/mnt/111", "/mnt/222", "/mnt/333", "/mnt/444", "/mnt/555", "/mnt/666", "/mnt/777", "/mnt/888", "/mnt/999", "/mnt/aaa", "/mnt/bbb", "/mnt/ccc", "/mnt/ddd", "/mnt/eee", "/mnt/fff", NULL }; for (pdir = bstg_dirs; *pdir; pdir++) { mkdir(*pdir, 0777); } } void dosync() { sync(); } int main() { unsigned x; int status; void (*funcs[])() = { dogcore, dowrite, dounlink, dolink, dowrite, dounlink, dolink, dowrite, dosync, dowrite, dounlink, dolink, dowrite, dounlink, dolink, dowrite, }; /* we only can domkdir() once at startup */ domkdir(); /* create 128 children that loop forever running 4 operations */ dosync(); for (x = 0; x < 128; x++) { if (fork() == 0) { /* give child a new seed for the pathname selection */ srand(x); for (;;) { /* each child will start looping at different function */ (*funcs[x++ % 16]) (); } /* we never expect this code to run */ _exit(1); } } /* block forever for all our children */ while(wait(&status) > 0); return 0; }