/* * $OpenBSD: dup2test.c,v 1.3 2003/07/31 21:48:08 deraadt Exp $ * $OpenBSD: dup2_self.c,v 1.3 2003/07/31 21:48:08 deraadt Exp $ * $OpenBSD: fcntl_dup.c,v 1.2 2003/07/31 21:48:08 deraadt Exp $ * * Written by Artur Grabowski 2002 Public Domain. * * $FreeBSD$ */ /* * Test #1: check if dup(2) works. * Test #2: check if dup2(2) works. * Test #3: check if dup2(2) returned a fd we asked for. * Test #4: check if dup2(2) cleared close-on-exec flag for duped fd. * Test #5: check if dup2(2) allows to dup fd to itself. * Test #6: check if dup2(2) returned a fd we asked for. * Test #7: check if dup2(2) did not clear close-on-exec flag for duped fd. * Test #8: check if fcntl(F_DUPFD) works. * Test #9: check if fcntl(F_DUPFD) cleared close-on-exec flag for duped fd. * Test #10: check if dup2() to a fd > current maximum number of open files * limit work. * Test #11: check if fcntl(F_DUP2FD) works. * Test #12: check if fcntl(F_DUP2FD) returned a fd we asked for. * Test #13: check if fcntl(F_DUP2FD) cleared close-on-exec flag for duped fd. * Test #14: check if fcntl(F_DUP2FD) allows to dup fd to itself. * Test #15: check if fcntl(F_DUP2FD) returned a fd we asked for. * Test #16: check if fcntl(F_DUP2FD) did not clear close-on-exec flag for * duped fd. * Test #17: check if fcntl(F_DUP2FD) to a fd > current maximum number of open * files limit work. * Test #18: check if fcntl(F_DUPFD_CLOEXEC) works. * Test #19: check if fcntl(F_DUPFD_CLOEXEC) set close-on-exec flag for duped * fd. * Test #20: check if fcntl(F_DUP2FD_CLOEXEC) works. * Test #21: check if fcntl(F_DUP2FD_CLOEXEC) returned a fd we asked for. * Test #22: check if fcntl(F_DUP2FD_CLOEXEC) set close-on-exec flag for duped * fd. * Test #23: check if fcntl(F_DUP2FD_CLOEXEC) to a fd > current maximum number * of open files limit work. * Test #24: check if dup3(O_CLOEXEC) works. * Test #25: check if dup3(O_CLOEXEC) returned a fd we asked for. * Test #26: check if dup3(O_CLOEXEC) set close-on-exec flag for duped fd. * Test #27: check if dup3(0) works. * Test #28: check if dup3(0) returned a fd we asked for. * Test #29: check if dup3(0) cleared close-on-exec flag for duped fd. * Test #30: check if dup3(O_CLOEXEC) fails if oldfd == newfd. * Test #31: check if dup3(0) fails if oldfd == newfd. * Test #32: check if dup3(O_CLOEXEC) to a fd > current maximum number of * open files limit work. */ #include #include #include #include #include #include #include #include static int getafile(void); static int getafile(void) { int fd; char temp[] = "/tmp/dup2XXXXXXXXX"; if ((fd = mkstemp(temp)) < 0) err(1, "mkstemp"); remove(temp); if (ftruncate(fd, 1024) != 0) err(1, "ftruncate"); return (fd); } int main(int __unused argc, char __unused *argv[]) { struct rlimit rlp; int orgfd, fd1, fd2, test = 0; orgfd = getafile(); printf("1..32\n"); /* If dup(2) ever work? */ if ((fd1 = dup(orgfd)) < 0) err(1, "dup"); printf("ok %d - dup(2) works\n", ++test); /* Set close-on-exec */ if (fcntl(fd1, F_SETFD, 1) != 0) err(1, "fcntl(F_SETFD)"); /* If dup2(2) ever work? */ if ((fd2 = dup2(fd1, fd1 + 1)) < 0) err(1, "dup2"); printf("ok %d - dup2(2) works\n", ++test); /* Do we get the right fd? */ ++test; if (fd2 != fd1 + 1) printf("no ok %d - dup2(2) didn't give us the right fd\n", test); else printf("ok %d - dup2(2) returned a correct fd\n", test); /* Was close-on-exec cleared? */ ++test; if (fcntl(fd2, F_GETFD) != 0) printf("not ok %d - dup2(2) didn't clear close-on-exec\n", test); else printf("ok %d - dup2(2) cleared close-on-exec\n", test); /* * Dup to itself. * * We're testing a small tweak in dup2 semantics. * Normally dup and dup2 will clear the close-on-exec * flag on the new fd (which appears to be an implementation * mistake from start and not some planned behavior). * In today's implementations of dup and dup2 we have to make * an effort to really clear that flag. But all tested * implementations of dup2 have another tweak. If we * dup2(old, new) when old == new, the syscall short-circuits * and returns early (because there is no need to do all the * work (and there is a risk for serious mistakes)). * So although the docs say that dup2 should "take 'old', * close 'new' perform a dup(2) of 'old' into 'new'" * the docs are not really followed because close-on-exec * is not cleared on 'new'. * * Since everyone has this bug, we pretend that this is * the way it is supposed to be and test here that it really * works that way. * * This is a fine example on where two separate implementation * fuckups take out each other and make the end-result the way * it was meant to be. */ if ((fd2 = dup2(fd1, fd1)) < 0) err(1, "dup2"); printf("ok %d - dup2(2) to itself works\n", ++test); /* Do we get the right fd? */ ++test; if (fd2 != fd1) printf("not ok %d - dup2(2) didn't give us the right fd\n", test); else printf("ok %d - dup2(2) to itself returned a correct fd\n", test); /* Was close-on-exec cleared? */ ++test; if (fcntl(fd2, F_GETFD) == 0) printf("not ok %d - dup2(2) cleared close-on-exec\n", test); else printf("ok %d - dup2(2) didn't clear close-on-exec\n", test); /* Does fcntl(F_DUPFD) work? */ if ((fd2 = fcntl(fd1, F_DUPFD, 10)) < 0) err(1, "fcntl(F_DUPFD)"); if (fd2 < 10) printf("not ok %d - fcntl(F_DUPFD) returned wrong fd %d\n", ++test, fd2); else printf("ok %d - fcntl(F_DUPFD) works\n", ++test); /* Was close-on-exec cleared? */ ++test; if (fcntl(fd2, F_GETFD) != 0) printf( "not ok %d - fcntl(F_DUPFD) didn't clear close-on-exec\n", test); else printf("ok %d - fcntl(F_DUPFD) cleared close-on-exec\n", test); ++test; if (getrlimit(RLIMIT_NOFILE, &rlp) < 0) err(1, "getrlimit"); if ((fd2 = dup2(fd1, rlp.rlim_cur + 1)) >= 0) printf("not ok %d - dup2(2) bypassed NOFILE limit\n", test); else printf("ok %d - dup2(2) didn't bypass NOFILE limit\n", test); /* If fcntl(F_DUP2FD) ever work? */ if ((fd2 = fcntl(fd1, F_DUP2FD, fd1 + 1)) < 0) err(1, "fcntl(F_DUP2FD)"); printf("ok %d - fcntl(F_DUP2FD) works\n", ++test); /* Do we get the right fd? */ ++test; if (fd2 != fd1 + 1) printf( "no ok %d - fcntl(F_DUP2FD) didn't give us the right fd\n", test); else printf("ok %d - fcntl(F_DUP2FD) returned a correct fd\n", test); /* Was close-on-exec cleared? */ ++test; if (fcntl(fd2, F_GETFD) != 0) printf( "not ok %d - fcntl(F_DUP2FD) didn't clear close-on-exec\n", test); else printf("ok %d - fcntl(F_DUP2FD) cleared close-on-exec\n", test); /* Dup to itself */ if ((fd2 = fcntl(fd1, F_DUP2FD, fd1)) < 0) err(1, "fcntl(F_DUP2FD)"); printf("ok %d - fcntl(F_DUP2FD) to itself works\n", ++test); /* Do we get the right fd? */ ++test; if (fd2 != fd1) printf( "not ok %d - fcntl(F_DUP2FD) didn't give us the right fd\n", test); else printf( "ok %d - fcntl(F_DUP2FD) to itself returned a correct fd\n", test); /* Was close-on-exec cleared? */ ++test; if (fcntl(fd2, F_GETFD) == 0) printf("not ok %d - fcntl(F_DUP2FD) cleared close-on-exec\n", test); else printf("ok %d - fcntl(F_DUP2FD) didn't clear close-on-exec\n", test); ++test; if (getrlimit(RLIMIT_NOFILE, &rlp) < 0) err(1, "getrlimit"); if ((fd2 = fcntl(fd1, F_DUP2FD, rlp.rlim_cur + 1)) >= 0) printf("not ok %d - fcntl(F_DUP2FD) bypassed NOFILE limit\n", test); else printf("ok %d - fcntl(F_DUP2FD) didn't bypass NOFILE limit\n", test); /* Does fcntl(F_DUPFD_CLOEXEC) work? */ if ((fd2 = fcntl(fd1, F_DUPFD_CLOEXEC, 10)) < 0) err(1, "fcntl(F_DUPFD_CLOEXEC)"); if (fd2 < 10) printf("not ok %d - fcntl(F_DUPFD_CLOEXEC) returned wrong fd %d\n", ++test, fd2); else printf("ok %d - fcntl(F_DUPFD_CLOEXEC) works\n", ++test); /* Was close-on-exec cleared? */ ++test; if (fcntl(fd2, F_GETFD) != 1) printf( "not ok %d - fcntl(F_DUPFD_CLOEXEC) didn't set close-on-exec\n", test); else printf("ok %d - fcntl(F_DUPFD_CLOEXEC) set close-on-exec\n", test); /* If fcntl(F_DUP2FD_CLOEXEC) ever work? */ if ((fd2 = fcntl(fd1, F_DUP2FD_CLOEXEC, fd1 + 1)) < 0) err(1, "fcntl(F_DUP2FD_CLOEXEC)"); printf("ok %d - fcntl(F_DUP2FD_CLOEXEC) works\n", ++test); /* Do we get the right fd? */ ++test; if (fd2 != fd1 + 1) printf( "no ok %d - fcntl(F_DUP2FD_CLOEXEC) didn't give us the right fd\n", test); else printf("ok %d - fcntl(F_DUP2FD_CLOEXEC) returned a correct fd\n", test); /* Was close-on-exec set? */ ++test; if (fcntl(fd2, F_GETFD) != FD_CLOEXEC) printf( "not ok %d - fcntl(F_DUP2FD_CLOEXEC) didn't set close-on-exec\n", test); else printf("ok %d - fcntl(F_DUP2FD_CLOEXEC) set close-on-exec\n", test); /* * It is unclear what F_DUP2FD_CLOEXEC should do when duplicating a * file descriptor onto itself. */ ++test; if (getrlimit(RLIMIT_NOFILE, &rlp) < 0) err(1, "getrlimit"); if ((fd2 = fcntl(fd1, F_DUP2FD_CLOEXEC, rlp.rlim_cur + 1)) >= 0) printf("not ok %d - fcntl(F_DUP2FD_CLOEXEC) bypassed NOFILE limit\n", test); else printf("ok %d - fcntl(F_DUP2FD_CLOEXEC) didn't bypass NOFILE limit\n", test); /* Does dup3(O_CLOEXEC) ever work? */ if ((fd2 = dup3(fd1, fd1 + 1, O_CLOEXEC)) < 0) err(1, "dup3(O_CLOEXEC)"); printf("ok %d - dup3(O_CLOEXEC) works\n", ++test); /* Do we get the right fd? */ ++test; if (fd2 != fd1 + 1) printf( "no ok %d - dup3(O_CLOEXEC) didn't give us the right fd\n", test); else printf("ok %d - dup3(O_CLOEXEC) returned a correct fd\n", test); /* Was close-on-exec set? */ ++test; if (fcntl(fd2, F_GETFD) != FD_CLOEXEC) printf( "not ok %d - dup3(O_CLOEXEC) didn't set close-on-exec\n", test); else printf("ok %d - dup3(O_CLOEXEC) set close-on-exec\n", test); /* Does dup3(0) ever work? */ if ((fd2 = dup3(fd1, fd1 + 1, 0)) < 0) err(1, "dup3(0)"); printf("ok %d - dup3(0) works\n", ++test); /* Do we get the right fd? */ ++test; if (fd2 != fd1 + 1) printf( "no ok %d - dup3(0) didn't give us the right fd\n", test); else printf("ok %d - dup3(0) returned a correct fd\n", test); /* Was close-on-exec cleared? */ ++test; if (fcntl(fd2, F_GETFD) != 0) printf( "not ok %d - dup3(0) didn't clear close-on-exec\n", test); else printf("ok %d - dup3(0) cleared close-on-exec\n", test); /* dup3() does not allow duplicating to the same fd */ ++test; if (dup3(fd1, fd1, O_CLOEXEC) != -1) printf( "not ok %d - dup3(fd1, fd1, O_CLOEXEC) succeeded\n", test); else printf("ok %d - dup3(fd1, fd1, O_CLOEXEC) failed\n", test); ++test; if (dup3(fd1, fd1, 0) != -1) printf( "not ok %d - dup3(fd1, fd1, 0) succeeded\n", test); else printf("ok %d - dup3(fd1, fd1, 0) failed\n", test); ++test; if (getrlimit(RLIMIT_NOFILE, &rlp) < 0) err(1, "getrlimit"); if ((fd2 = dup3(fd1, rlp.rlim_cur + 1, O_CLOEXEC)) >= 0) printf("not ok %d - dup3(O_CLOEXEC) bypassed NOFILE limit\n", test); else printf("ok %d - dup3(O_CLOEXEC) didn't bypass NOFILE limit\n", test); return (0); }