[LTP] [PATCH] Probe an bigger linear available address to attachment.

[yangzi <wyang@windriver.com>]

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Hi

When running shmat01 on some platforms, it fails on
"addr = shmat(*(tc.shmid), base_addr + tc.offset,tc.flags);"
with a INVAL error. Look at codes in "setup()", it probes
an available address and align the address to SHMLBA. After
alignment, the new address is no guarantee to be available
any more. Here a bigger size is used to probe so that it's
still valid address after alignment.Pertaining to the function 
setup_tc(lc, &tc) ,when it outside of "for (i = 0; i < TST_TOTAL; 
i++)",and printf the tc.offset value is always 0,add correct a mistake
of original codes to move "setup_tc()" to right place.

Signed-off-by: Yang Wei <wei.yang@windriver.com>

wei yang
BR

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From 22b24a3d16a751f6512a7691abc46f9d744c091a Mon Sep 17 00:00:00 2001
From: Yang Wei <wyang@windriver.com>
Date: Tue, 31 Aug 2010 18:02:16 +0800
Subject: [PATCH] Probe an bigger linear available address to attachment.

When running shmat01 on some platforms, it fails on
"addr = shmat(*(tc.shmid), base_addr + tc.offset,tc.flags);"
with a EINVAL error. Look at codes in "setup()", it probes
an available address and align the address to SHMLBA. After
alignment, the new address is no guarantee to be available
any more. Here a bigger size is used to probe so that it's
still valid address after alignment.And correct a mistake
of original codes to move "setup_tc()" to right place.

Signed-off-by: Yang Wei <wei.yang@windriver.com>
---
 testcases/kernel/syscalls/ipc/shmat/shmat01.c |   15 ++++++++++++---
 1 files changed, 12 insertions(+), 3 deletions(-)

diff --git a/testcases/kernel/syscalls/ipc/shmat/shmat01.c b/testcases/kernel/syscalls/ipc/shmat/shmat01.c
index 4cb5eaf..ec6ae89 100644
--- a/testcases/kernel/syscalls/ipc/shmat/shmat01.c
+++ b/testcases/kernel/syscalls/ipc/shmat/shmat01.c
@@ -120,11 +120,12 @@ int main(int ac, char **av)
 		/* reset Tst_count in case we are looping */
 		Tst_count = 0;
 
-		/* setup test case paremeters */
-		setup_tc(lc, &tc);
 
 		/* loop through the test cases */
 		for (i = 0; i < TST_TOTAL; i++) {
+		
+			/* setup test case paremeters */
+			setup_tc(i, &tc);
 
 			/*
 			 * Use TEST macro to make the call
@@ -246,6 +247,8 @@ void check_functionality(int i)
  */
 void setup(void)
 {
+	int shm_id_2;
+
 	/* capture signals */
 	tst_sig(NOFORK, DEF_HANDLER, cleanup);
 
@@ -270,12 +273,18 @@ void setup(void)
 	}
 
 	/* Probe an available linear address for attachment */
-	if ((base_addr = shmat(shm_id_1, NULL, 0)) == (void *)-1) {
+	if ((shm_id_2 = shmget(shmkey++, SHMLBA + INT_SIZE, SHM_RW | IPC_CREAT |
+			       IPC_EXCL)) == -1) {
+		tst_brkm(TBROK, cleanup, "Failed to create shared memory "
+			 "resource 1 in setup()");
+	}
+	if ((base_addr = shmat(shm_id_2, NULL, 0)) == (void *)-1) {
 		tst_brkm(TBROK, cleanup, "Couldn't attach shared memory");
 	}
 	if (shmdt((const void *)base_addr) == -1) {
 		tst_brkm(TBROK, cleanup, "Couldn't detach shared memory");
 	}
+	rm_shm(shm_id_2);
 
 	/* some architectures (e.g. parisc) are strange, so better always align to
 	 * next SHMLBA address. */
-- 
1.6.0.4


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