1570af302Sopenharmony_ci#include <stdio.h> 2570af302Sopenharmony_ci#include <fcntl.h> 3570af302Sopenharmony_ci#include <unistd.h> 4570af302Sopenharmony_ci#include <errno.h> 5570af302Sopenharmony_ci#include <string.h> 6570af302Sopenharmony_ci#include <sys/wait.h> 7570af302Sopenharmony_ci#include "test.h" 8570af302Sopenharmony_ci 9570af302Sopenharmony_ci#define TEST(c, ...) ((c) ? 1 : (t_error(#c" failed: " __VA_ARGS__),0)) 10570af302Sopenharmony_ci#define TESTE(c) (errno=0, TEST(c, "errno = %s\n", strerror(errno))) 11570af302Sopenharmony_ci 12570af302Sopenharmony_ciint main(void) 13570af302Sopenharmony_ci{ 14570af302Sopenharmony_ci struct flock fl = {0}; 15570af302Sopenharmony_ci FILE *f; 16570af302Sopenharmony_ci int fd; 17570af302Sopenharmony_ci pid_t pid; 18570af302Sopenharmony_ci int status; 19570af302Sopenharmony_ci 20570af302Sopenharmony_ci if (!TESTE(f=tmpfile())) return t_status; 21570af302Sopenharmony_ci fd = fileno(f); 22570af302Sopenharmony_ci 23570af302Sopenharmony_ci fl.l_type = F_WRLCK; 24570af302Sopenharmony_ci fl.l_whence = SEEK_SET; 25570af302Sopenharmony_ci fl.l_start = 0; 26570af302Sopenharmony_ci fl.l_len = 0; 27570af302Sopenharmony_ci TESTE(fcntl(fd, F_SETLK, &fl)==0); 28570af302Sopenharmony_ci 29570af302Sopenharmony_ci pid = fork(); 30570af302Sopenharmony_ci if (!pid) { 31570af302Sopenharmony_ci fl.l_type = F_RDLCK; 32570af302Sopenharmony_ci _exit(fcntl(fd, F_SETLK, &fl)==0 || 33570af302Sopenharmony_ci (errno!=EAGAIN && errno!=EACCES)); 34570af302Sopenharmony_ci } 35570af302Sopenharmony_ci while (waitpid(pid, &status, 0)<0 && errno==EINTR); 36570af302Sopenharmony_ci TEST(status==0, "lock failed to work\n"); 37570af302Sopenharmony_ci 38570af302Sopenharmony_ci pid = fork(); 39570af302Sopenharmony_ci if (!pid) { 40570af302Sopenharmony_ci fl.l_type = F_WRLCK; 41570af302Sopenharmony_ci _exit(fcntl(fd, F_GETLK, &fl) || fl.l_pid != getppid()); 42570af302Sopenharmony_ci } 43570af302Sopenharmony_ci while (waitpid(pid, &status, 0)<0 && errno==EINTR); 44570af302Sopenharmony_ci TEST(status==0, "child failed to detect lock held by parent\n"); 45570af302Sopenharmony_ci 46570af302Sopenharmony_ci fclose(f); 47570af302Sopenharmony_ci 48570af302Sopenharmony_ci return t_status; 49570af302Sopenharmony_ci} 50