diff options
Diffstat (limited to 'tools/regression/file/dup/dup.c')
| -rw-r--r-- | tools/regression/file/dup/dup.c | 160 |
1 files changed, 160 insertions, 0 deletions
diff --git a/tools/regression/file/dup/dup.c b/tools/regression/file/dup/dup.c new file mode 100644 index 0000000..ad1f6df --- /dev/null +++ b/tools/regression/file/dup/dup.c @@ -0,0 +1,160 @@ +/* + * $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 <art@openbsd.org> 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. + */ + +#include <sys/types.h> +#include <sys/time.h> +#include <sys/resource.h> + +#include <err.h> +#include <fcntl.h> +#include <stdio.h> +#include <stdlib.h> +#include <unistd.h> + +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..10\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 todays 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)) < 0) + err(1, "fcntl(F_DUPFD)"); + 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); + + return (0); +} |
