1b32f58018498ea2225959b0ba11c18f0c433deefEvgeniy Stepanov 2b32f58018498ea2225959b0ba11c18f0c433deefEvgeniy Stepanov/* Test program to demonstrate valgrind breaking fcntl locks during 3b32f58018498ea2225959b0ba11c18f0c433deefEvgeniy Stepanov * mmap. Feed it a r/w file, such as its own source code. */ 4b32f58018498ea2225959b0ba11c18f0c433deefEvgeniy Stepanov 5b32f58018498ea2225959b0ba11c18f0c433deefEvgeniy Stepanov/* See bug 280965. */ 6b32f58018498ea2225959b0ba11c18f0c433deefEvgeniy Stepanov 7b32f58018498ea2225959b0ba11c18f0c433deefEvgeniy Stepanov#include <stdio.h> 8b32f58018498ea2225959b0ba11c18f0c433deefEvgeniy Stepanov#include <stdlib.h> 9b32f58018498ea2225959b0ba11c18f0c433deefEvgeniy Stepanov#include <unistd.h> 10b32f58018498ea2225959b0ba11c18f0c433deefEvgeniy Stepanov#include <fcntl.h> 11b32f58018498ea2225959b0ba11c18f0c433deefEvgeniy Stepanov#include <sys/mman.h> 12b32f58018498ea2225959b0ba11c18f0c433deefEvgeniy Stepanov#include <sys/types.h> 13b32f58018498ea2225959b0ba11c18f0c433deefEvgeniy Stepanov#include <sys/wait.h> 14b32f58018498ea2225959b0ba11c18f0c433deefEvgeniy Stepanov#include <err.h> 15b32f58018498ea2225959b0ba11c18f0c433deefEvgeniy Stepanov 16b32f58018498ea2225959b0ba11c18f0c433deefEvgeniy Stepanovint main(int argc, char *argv[]) 17b32f58018498ea2225959b0ba11c18f0c433deefEvgeniy Stepanov{ 18b32f58018498ea2225959b0ba11c18f0c433deefEvgeniy Stepanov struct flock fl; 19b32f58018498ea2225959b0ba11c18f0c433deefEvgeniy Stepanov const char *file = /* argv[1]; */ 20b32f58018498ea2225959b0ba11c18f0c433deefEvgeniy Stepanov "mmap_fcntl_bug.c"; 21b32f58018498ea2225959b0ba11c18f0c433deefEvgeniy Stepanov int fd, status; 22b32f58018498ea2225959b0ba11c18f0c433deefEvgeniy Stepanov 23b32f58018498ea2225959b0ba11c18f0c433deefEvgeniy Stepanov if (!file) 24b32f58018498ea2225959b0ba11c18f0c433deefEvgeniy Stepanov errx(1, "Usage: %s <normal-file>", argv[0]); 25b32f58018498ea2225959b0ba11c18f0c433deefEvgeniy Stepanov 26b32f58018498ea2225959b0ba11c18f0c433deefEvgeniy Stepanov fd = open(file, O_RDWR); 27b32f58018498ea2225959b0ba11c18f0c433deefEvgeniy Stepanov if (fd < 0) 28b32f58018498ea2225959b0ba11c18f0c433deefEvgeniy Stepanov err(1, "Opening %s", file); 29b32f58018498ea2225959b0ba11c18f0c433deefEvgeniy Stepanov 30b32f58018498ea2225959b0ba11c18f0c433deefEvgeniy Stepanov fl.l_type = F_WRLCK; 31b32f58018498ea2225959b0ba11c18f0c433deefEvgeniy Stepanov fl.l_whence = SEEK_SET; 32b32f58018498ea2225959b0ba11c18f0c433deefEvgeniy Stepanov fl.l_start = 0; 33b32f58018498ea2225959b0ba11c18f0c433deefEvgeniy Stepanov fl.l_len = 1; 34b32f58018498ea2225959b0ba11c18f0c433deefEvgeniy Stepanov 35b32f58018498ea2225959b0ba11c18f0c433deefEvgeniy Stepanov /* I'm assuming noone else tries to lock this! */ 36b32f58018498ea2225959b0ba11c18f0c433deefEvgeniy Stepanov if (fcntl(fd, F_SETLK, &fl) != 0) 37b32f58018498ea2225959b0ba11c18f0c433deefEvgeniy Stepanov err(1, "Locking %s", file); 38b32f58018498ea2225959b0ba11c18f0c433deefEvgeniy Stepanov 39b32f58018498ea2225959b0ba11c18f0c433deefEvgeniy Stepanov /* If under valgrind, mmap re-opens and closes file, screwing us */ 40b32f58018498ea2225959b0ba11c18f0c433deefEvgeniy Stepanov if (mmap(NULL, getpagesize(), PROT_READ|PROT_WRITE, MAP_PRIVATE, fd, 0) == MAP_FAILED) 41b32f58018498ea2225959b0ba11c18f0c433deefEvgeniy Stepanov err(1, "mmap of %s", file); 42b32f58018498ea2225959b0ba11c18f0c433deefEvgeniy Stepanov 43b32f58018498ea2225959b0ba11c18f0c433deefEvgeniy Stepanov switch (fork()) { 44b32f58018498ea2225959b0ba11c18f0c433deefEvgeniy Stepanov case 0: 45b32f58018498ea2225959b0ba11c18f0c433deefEvgeniy Stepanov /* Child. Lock should fail. */ 46b32f58018498ea2225959b0ba11c18f0c433deefEvgeniy Stepanov if (fcntl(fd, F_SETLK, &fl) == 0) 47b32f58018498ea2225959b0ba11c18f0c433deefEvgeniy Stepanov exit(1); 48b32f58018498ea2225959b0ba11c18f0c433deefEvgeniy Stepanov exit(0); 49b32f58018498ea2225959b0ba11c18f0c433deefEvgeniy Stepanov case -1: 50b32f58018498ea2225959b0ba11c18f0c433deefEvgeniy Stepanov err(1, "Fork failed"); 51b32f58018498ea2225959b0ba11c18f0c433deefEvgeniy Stepanov } 52b32f58018498ea2225959b0ba11c18f0c433deefEvgeniy Stepanov 53b32f58018498ea2225959b0ba11c18f0c433deefEvgeniy Stepanov if (wait(&status) == -1) 54b32f58018498ea2225959b0ba11c18f0c433deefEvgeniy Stepanov err(1, "Child vanished?"); 55b32f58018498ea2225959b0ba11c18f0c433deefEvgeniy Stepanov 56b32f58018498ea2225959b0ba11c18f0c433deefEvgeniy Stepanov if (!WIFEXITED(status)) 57b32f58018498ea2225959b0ba11c18f0c433deefEvgeniy Stepanov errx(1, "Child died with signal %i", WTERMSIG(status)); 58b32f58018498ea2225959b0ba11c18f0c433deefEvgeniy Stepanov 59b32f58018498ea2225959b0ba11c18f0c433deefEvgeniy Stepanov switch (WEXITSTATUS(status)) { 60b32f58018498ea2225959b0ba11c18f0c433deefEvgeniy Stepanov case 1: 61b32f58018498ea2225959b0ba11c18f0c433deefEvgeniy Stepanov errx(1, "Child got lock, we must have dropped it (TEST FAILED)"); 62b32f58018498ea2225959b0ba11c18f0c433deefEvgeniy Stepanov case 0: 63b32f58018498ea2225959b0ba11c18f0c433deefEvgeniy Stepanov fprintf(stderr, "Child exited with zero (TEST PASSED).\n"); 64b32f58018498ea2225959b0ba11c18f0c433deefEvgeniy Stepanov return 0; 65b32f58018498ea2225959b0ba11c18f0c433deefEvgeniy Stepanov default: 66b32f58018498ea2225959b0ba11c18f0c433deefEvgeniy Stepanov errx(1, "Child weird exit status %i", WEXITSTATUS(status)); 67b32f58018498ea2225959b0ba11c18f0c433deefEvgeniy Stepanov } 68b32f58018498ea2225959b0ba11c18f0c433deefEvgeniy Stepanov} 69