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[Qemu-devel] [PULL 21/22] linux-user: added support for pwritev() system
From: |
riku . voipio |
Subject: |
[Qemu-devel] [PULL 21/22] linux-user: added support for pwritev() system call. |
Date: |
Mon, 17 Oct 2016 16:24:39 +0300 |
From: Dejan Jovicevic <address@hidden>
This system call performs the same task as the writev() 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 pwritev() implementation is based on the writev()
implementation in linux-user mode.
But, since pwritev() 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_pwritev() 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_pwritev().
Signed-off-by: Dejan Jovicevic <address@hidden>
Signed-off-by: Riku Voipio <address@hidden>
---
linux-user/syscall.c | 15 +++++++++++++++
1 file changed, 15 insertions(+)
diff --git a/linux-user/syscall.c b/linux-user/syscall.c
index 10c940c..2072b1f 100644
--- a/linux-user/syscall.c
+++ b/linux-user/syscall.c
@@ -921,6 +921,8 @@ 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_syscall5(ssize_t, pwritev, 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,
@@ -10092,6 +10094,19 @@ abi_long do_syscall(void *cpu_env, int num, abi_long
arg1,
}
break;
#endif
+#if defined(TARGET_NR_pwritev)
+ case TARGET_NR_pwritev:
+ {
+ struct iovec *vec = lock_iovec(VERIFY_READ, arg2, arg3, 1);
+ if (vec != NULL) {
+ ret = get_errno(safe_pwritev(arg1, vec, arg3, arg4, arg5));
+ unlock_iovec(vec, arg2, arg3, 0);
+ } else {
+ ret = -host_to_target_errno(errno);
+ }
+ }
+ break;
+#endif
case TARGET_NR_getsid:
ret = get_errno(getsid(arg1));
break;
--
2.1.4
- [Qemu-devel] [PULL 13/22] linux-user: Fix definition of target_sigevent for 32-bit guests, (continued)
- [Qemu-devel] [PULL 13/22] linux-user: Fix definition of target_sigevent for 32-bit guests, riku . voipio, 2016/10/17
- [Qemu-devel] [PULL 14/22] linux-user: Add support for clock_adjtime() syscall, riku . voipio, 2016/10/17
- [Qemu-devel] [PULL 15/22] linux-user: Add support for syncfs() syscall, riku . voipio, 2016/10/17
- [Qemu-devel] [PULL 12/22] linux-user: use libc wrapper instead of direct mremap syscall, riku . voipio, 2016/10/17
- [Qemu-devel] [PULL 19/22] linux-user: Fix fadvise64() syscall support for Mips32, riku . voipio, 2016/10/17
- [Qemu-devel] [PULL 18/22] linux-user: Redirect termbits.h for Mips64 to termbits.h for Mips32, riku . voipio, 2016/10/17
- [Qemu-devel] [PULL 17/22] linux-user: Update ioctls definitions for Mips32, riku . voipio, 2016/10/17
- [Qemu-devel] [PULL 16/22] linux-user: Update mips_syscall_args[] array in main.c, riku . voipio, 2016/10/17
- [Qemu-devel] [PULL 20/22] linux-user: added support for preadv() system call., riku . voipio, 2016/10/17
- [Qemu-devel] [PULL 22/22] linux-user: disable unicore32 linux-user build, riku . voipio, 2016/10/17
- [Qemu-devel] [PULL 21/22] linux-user: added support for pwritev() system call.,
riku . voipio <=
- Re: [Qemu-devel] [PULL 00/22] linux-user changes, Peter Maydell, 2016/10/17