From ac8d4c1632ea0f2be39d6cf75a01ccbe34ae791c Mon Sep 17 00:00:00 2001 From: Roy Lee Date: Mon, 19 May 2008 09:39:24 +0800 Subject: [PATCH] This patch attaches the shared memory segment twice to the child's address space and verifies that their contents are the same. --- testcases/kernel/mem/shmt/shmt06.c | 31 ++++++++++++++++++++++++++++--- 1 files changed, 28 insertions(+), 3 deletions(-) diff --git a/testcases/kernel/mem/shmt/shmt06.c b/testcases/kernel/mem/shmt/shmt06.c index 8fec106..e7a6e88 100644 --- a/testcases/kernel/mem/shmt/shmt06.c +++ b/testcases/kernel/mem/shmt/shmt06.c @@ -30,9 +30,9 @@ * ALGORITHM * Parent process forks a child. Child pauses until parent has created * a shared memory segment, attached to it and written to it too. At that - * time child gets the shared memory segment id, attaches to it at a - * different address than the parents and verifies that its contents are - * the same as the contents of the parent attached segment. + * time child gets the shared memory segment id, attaches to it at two + * different addresses than the parents and verifies that their contents + * are the same as the contents of the parent attached segment. * */ @@ -184,6 +184,31 @@ int child() } } + /* + * Attach the segment to a different addresse + * and verify it's contents again. + */ + cp = (char *)shmat(shmid, (void *)NULL, 0); + + if (cp == (char *)-1) { + perror("shmat:child process"); + tst_resm(TFAIL, + "Error: shmat: errno=%d, shmid=%d, child_pid=%d\n", + errno, shmid, chld_pid); + } else { + if (*cp != 'A') { + tst_resm(TFAIL, "child: not A\n"); + } + if (*(cp + 1) != 'B') { + tst_resm(TFAIL, "child: not B\n"); + } + if (*(cp + 2) != 'C') { + tst_resm(TFAIL, "child: not C\n"); + } + if (*(cp + 8192) != 0) { + tst_resm(TFAIL, "child: not 0\n"); + } + } } tst_exit(); return (0); -- 1.5.5.1.309.g0702