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[PULL,v2,20/22] linux-user: added support for preadv() system call.

Message ID f00a8585f4720a5ada76093ed126528cf8b02b2c.1476796525.git.riku.voipio@linaro.org
State Accepted
Commit 0f26386c27d977d523c1e88410414af7739a1730
Headers show

Commit Message

Riku Voipio Oct. 18, 2016, 1:21 p.m. UTC 
From: Dejan Jovicevic <dejan.jovicevic@rt-rk.com>


This system call performs the same task as the readv() system call,
with the exception of having the fourth argument, offset, which
specifes the file offset at which the input operation is to be performed.
Because of this, the preadv() implementation is based on the readv()
implementation in linux-user mode.

But, since preadv() is implemented in the kernel as a 5-argument syscall,
5 arguments are needed to be handled as input and passed to the host
syscall.

The pos_l and pos_h argument of the safe_preadv() are of type unsigned
long, which can be of different sizes on different platforms. The input
arguments are converted to the appropriate host size when passed to
safe_preadv().

Signed-off-by: Dejan Jovicevic <dejan.jovicevic@rt-rk.com>

Signed-off-by: Riku Voipio <riku.voipio@linaro.org>

---
 linux-user/syscall.c | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

-- 
2.1.4
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Patch

diff --git a/linux-user/syscall.c b/linux-user/syscall.c
index d85a0b5..9cb2a8f 100644
--- a/linux-user/syscall.c
+++ b/linux-user/syscall.c
@@ -919,6 +919,8 @@  safe_syscall2(int, tkill, int, tid, int, sig)
 safe_syscall3(int, tgkill, int, tgid, int, pid, int, sig)
 safe_syscall3(ssize_t, readv, int, fd, const struct iovec *, iov, int, iovcnt)
 safe_syscall3(ssize_t, writev, int, fd, const struct iovec *, iov, int, iovcnt)
+safe_syscall5(ssize_t, preadv, int, fd, const struct iovec *, iov, int, iovcnt,
+              unsigned long, pos_l, unsigned long, pos_h)
 safe_syscall3(int, connect, int, fd, const struct sockaddr *, addr,
               socklen_t, addrlen)
 safe_syscall6(ssize_t, sendto, int, fd, const void *, buf, size_t, len,
@@ -10078,6 +10080,19 @@  abi_long do_syscall(void *cpu_env, int num, abi_long arg1,
             }
         }
         break;
+#if defined(TARGET_NR_preadv)
+    case TARGET_NR_preadv:
+        {
+            struct iovec *vec = lock_iovec(VERIFY_WRITE, arg2, arg3, 0);
+            if (vec != NULL) {
+                ret = get_errno(safe_preadv(arg1, vec, arg3, arg4, arg5));
+                unlock_iovec(vec, arg2, arg3, 1);
+            } else {
+                ret = -host_to_target_errno(errno);
+           }
+        }
+        break;
+#endif
     case TARGET_NR_getsid:
         ret = get_errno(getsid(arg1));
         break;