posix: Set p{read,write}v2 to return ENOTSUP (BZ#21780)

Different than other architectures hppa-linux-gnu define different values
for ENOTSUP and EOPNOTSUPP, where the later is a Linux specific one.
This leads to tst-preadwritev{64}v2 tests failures:

$ ./testrun.sh misc/tst-preadvwritev2
error: tst-preadvwritev2-common.c:35: preadv2 failure did not set errno to ENOTSUP (223)
error: 1 test failures

The straightforward fix is to return the POSIX defined ENOTSUP on all
p{read,write}v{64}v2 implementations instead of Linux specific one.

Checked on x86_64-linux-gnu and the tst-preadwritev{64}v2 on
hppa-linux-gnu (although due the installed kernel on my testing system
the pwritev{64}v2 with an invalid flag still fails due a known kernel
issue [1]).

	[BZ #21780]
	* sysdeps/posix/preadv2.c (preadv2): Use ENOTSUP instead of
	EOPNOTSUPP.
	* sysdeps/posix/preadv64v2.c (preadv64v2): Likewise.
	* sysdeps/posix/pwritev2.c (pwritev2): Likewise.
	* sysdeps/posix/pwritev64v2.c (pwritev64v2): Likewise.
	* sysdeps/unix/sysv/linux/preadv2.c (preadv2): Likewise.
	* sysdeps/unix/sysv/linux/preadv64v2.c (preadv64v2): Likewise.
	* sysdeps/unix/sysv/linux/pwritev2.c (pwritev2): Likewise.
	* sysdeps/unix/sysv/linux/pwritev64v2.c (pwritev64v2): Likewise.

[1] https://sourceware.org/ml/libc-alpha/2017-06/msg00726.html

9 files changed, 25 insertions, 12 deletions

diff --git a/ChangeLog b/ChangeLog
index 6add9dc4fa..28051e07fe 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,16 @@
+2017-08-07  Adhemerval Zanella  <adhemerval.zanella@linaro.org>
+
+	[BZ #21780]
+	* sysdeps/posix/preadv2.c (preadv2): Use ENOTSUP instead of
+	EOPNOTSUPP.
+	* sysdeps/posix/preadv64v2.c (preadv64v2): Likewise.
+	* sysdeps/posix/pwritev2.c (pwritev2): Likewise.
+	* sysdeps/posix/pwritev64v2.c (pwritev64v2): Likewise.
+	* sysdeps/unix/sysv/linux/preadv2.c (preadv2): Likewise.
+	* sysdeps/unix/sysv/linux/preadv64v2.c (preadv64v2): Likewise.
+	* sysdeps/unix/sysv/linux/pwritev2.c (pwritev2): Likewise.
+	* sysdeps/unix/sysv/linux/pwritev64v2.c (pwritev64v2): Likewise.
+
 2017-08-07  Joseph Myers  <joseph@codesourcery.com>
 
 	[BZ #21899]
diff --git a/sysdeps/posix/preadv2.c b/sysdeps/posix/preadv2.c
index 2a7cf11e27..d27f7028ed 100644
--- a/sysdeps/posix/preadv2.c
+++ b/sysdeps/posix/preadv2.c
@@ -28,7 +28,7 @@ preadv2 (int fd, const struct iovec *vector, int count, OFF_T offset,
 {
   if (flags != 0)
     {
-      __set_errno (EOPNOTSUPP);
+      __set_errno (ENOTSUP);
       return -1;
     }
 
diff --git a/sysdeps/posix/preadv64v2.c b/sysdeps/posix/preadv64v2.c
index e084f3f9e1..ce7cb40bf2 100644
--- a/sysdeps/posix/preadv64v2.c
+++ b/sysdeps/posix/preadv64v2.c
@@ -25,7 +25,7 @@ preadv64v2 (int fd, const struct iovec *vector, int count, OFF_T offset,
 {
   if (flags != 0)
     {
-      __set_errno (EOPNOTSUPP);
+      __set_errno (ENOTSUP);
       return -1;
     }
 
diff --git a/sysdeps/posix/pwritev2.c b/sysdeps/posix/pwritev2.c
index 5b7650c4fc..7ec8cbc407 100644
--- a/sysdeps/posix/pwritev2.c
+++ b/sysdeps/posix/pwritev2.c
@@ -28,7 +28,7 @@ pwritev2 (int fd, const struct iovec *vector, int count, OFF_T offset,
 {
   if (flags != 0)
     {
-      __set_errno (EOPNOTSUPP);
+      __set_errno (ENOTSUP);
       return -1;
     }
 
diff --git a/sysdeps/posix/pwritev64v2.c b/sysdeps/posix/pwritev64v2.c
index 0f2f9ef863..be98aeed9d 100644
--- a/sysdeps/posix/pwritev64v2.c
+++ b/sysdeps/posix/pwritev64v2.c
@@ -26,7 +26,7 @@ pwritev64v2 (int fd, const struct iovec *vector, int count, OFF_T offset,
 {
   if (flags != 0)
     {
-      __set_errno (EOPNOTSUPP);
+      __set_errno (ENOTSUP);
       return -1;
     }
 
diff --git a/sysdeps/unix/sysv/linux/preadv2.c b/sysdeps/unix/sysv/linux/preadv2.c
index 11fe85eaa8..137e2dd791 100644
--- a/sysdeps/unix/sysv/linux/preadv2.c
+++ b/sysdeps/unix/sysv/linux/preadv2.c
@@ -32,7 +32,7 @@ preadv2 (int fd, const struct iovec *vector, int count, off_t offset,
 # ifdef __NR_preadv2
   ssize_t result = SYSCALL_CANCEL (preadv2, fd, vector, count,
 				   LO_HI_LONG (offset), flags);
-  if (result >= 0 || errno != ENOSYS)
+  if (result >= 0)
     return result;
 # endif
   /* Trying to emulate the preadv2 syscall flags is troublesome:
@@ -46,7 +46,7 @@ preadv2 (int fd, const struct iovec *vector, int count, off_t offset,
 
   if (flags != 0)
     {
-      __set_errno (EOPNOTSUPP);
+      __set_errno (ENOTSUP);
       return -1;
     }
   return preadv (fd, vector, count, offset);
diff --git a/sysdeps/unix/sysv/linux/preadv64v2.c b/sysdeps/unix/sysv/linux/preadv64v2.c
index 9d7f8c9893..8f413253f4 100644
--- a/sysdeps/unix/sysv/linux/preadv64v2.c
+++ b/sysdeps/unix/sysv/linux/preadv64v2.c
@@ -30,7 +30,7 @@ preadv64v2 (int fd, const struct iovec *vector, int count, off64_t offset,
 #ifdef __NR_preadv64v2
   ssize_t result = SYSCALL_CANCEL (preadv64v2, fd, vector, count,
 				   LO_HI_LONG (offset), flags);
-  if (result >= 0 || errno != ENOSYS)
+  if (result >= 0)
     return result;
 #endif
   /* Trying to emulate the preadv2 syscall flags is troublesome:
@@ -44,7 +44,7 @@ preadv64v2 (int fd, const struct iovec *vector, int count, off64_t offset,
 
   if (flags != 0)
     {
-      __set_errno (EOPNOTSUPP);
+      __set_errno (ENOTSUP);
       return -1;
     }
   return preadv64 (fd, vector, count, offset);
diff --git a/sysdeps/unix/sysv/linux/pwritev2.c b/sysdeps/unix/sysv/linux/pwritev2.c
index 72f0471f96..8e5032fe2f 100644
--- a/sysdeps/unix/sysv/linux/pwritev2.c
+++ b/sysdeps/unix/sysv/linux/pwritev2.c
@@ -28,7 +28,7 @@ pwritev2 (int fd, const struct iovec *vector, int count, off_t offset,
 # ifdef __NR_pwritev2
   ssize_t result = SYSCALL_CANCEL (pwritev2, fd, vector, count,
 				   LO_HI_LONG (offset), flags);
-  if (result >= 0 || errno != ENOSYS)
+  if (result >= 0)
     return result;
 # endif
   /* Trying to emulate the pwritev2 syscall flags is troublesome:
@@ -42,7 +42,7 @@ pwritev2 (int fd, const struct iovec *vector, int count, off_t offset,
 
   if (flags != 0)
     {
-      __set_errno (EOPNOTSUPP);
+      __set_errno (ENOTSUP);
       return -1;
     }
   return pwritev (fd, vector, count, offset);
diff --git a/sysdeps/unix/sysv/linux/pwritev64v2.c b/sysdeps/unix/sysv/linux/pwritev64v2.c
index def9a0bc57..d2800c6657 100644
--- a/sysdeps/unix/sysv/linux/pwritev64v2.c
+++ b/sysdeps/unix/sysv/linux/pwritev64v2.c
@@ -30,7 +30,7 @@ pwritev64v2 (int fd, const struct iovec *vector, int count, off64_t offset,
 #ifdef __NR_pwritev64v2
   ssize_t result = SYSCALL_CANCEL (pwritev64v2, fd, vector, count,
 				   LO_HI_LONG (offset), flags);
-  if (result >= 0 || errno != ENOSYS)
+  if (result >= 0)
     return result;
 #endif
   /* Trying to emulate the pwritev2 syscall flags is troublesome:
@@ -44,7 +44,7 @@ pwritev64v2 (int fd, const struct iovec *vector, int count, off64_t offset,
 
   if (flags != 0)
     {
-      __set_errno (EOPNOTSUPP);
+      __set_errno (ENOTSUP);
       return -1;
     }
   return pwritev64 (fd, vector, count, offset);