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linux-user: add preadv2/preadv2

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Some programs apparently use these, like the python test suite.

The flags argument (rwf_t) is an int, with values shared on all arches
and does not need translating.

This was tested manually with the following python script:
```
import os
fd = os.open('test', os.O_RDWR|os.O_CREAT)
os.pwritev(fd, [b'test', b'ok'], 0, os.RWF_HIPRI)
buf = [bytearray(3), bytearray(10)]
os.preadv(fd, buf, 0, os.RWF_HIPRI)
print(buf[0])
print(buf[1])
```

Signed-off-by: Dominique Martinet <dominique.martinet@atmark-techno.com>
Reviewed-by: Helge Deller <deller@gmx.de>
Signed-off-by: Helge Deller <deller@gmx.de>
This commit is contained in:
Dominique Martinet
2026-06-10 07:54:52 +00:00
committed by Helge Deller
parent ec6a1f4398
commit fb4c08147b
1 changed files with 38 additions and 0 deletions
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38
linux-user/syscall.c
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@@ -741,6 +741,11 @@ 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_syscall6(ssize_t, preadv2, int, fd, const struct iovec *, iov, int, iovcnt,
unsigned long, pos_l, unsigned long, pos_h, __kernel_rwf_t, flags)
safe_syscall6(ssize_t, pwritev2, int, fd, const struct iovec *, iov,
int, iovcnt, unsigned long, pos_l, unsigned long, pos_h,
__kernel_rwf_t, flags)
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,
@@ -11907,6 +11912,39 @@ static abi_long do_syscall1(CPUArchState *cpu_env, int num, abi_long arg1,
}
}
return ret;
#endif
#if defined(TARGET_NR_preadv2)
case TARGET_NR_preadv2:
{
struct iovec *vec = lock_iovec(VERIFY_WRITE, arg2, arg3, 0);
if (vec != NULL) {
unsigned long low, high;
target_to_host_low_high(arg4, arg5, &low, &high);
ret = get_errno(safe_preadv2(arg1, vec, arg3, low, high, arg6));
unlock_iovec(vec, arg2, arg3, 1);
} else {
ret = -host_to_target_errno(errno);
}
}
return ret;
#endif
#if defined(TARGET_NR_pwritev2)
case TARGET_NR_pwritev2:
{
struct iovec *vec = lock_iovec(VERIFY_READ, arg2, arg3, 1);
if (vec != NULL) {
unsigned long low, high;
target_to_host_low_high(arg4, arg5, &low, &high);
ret = get_errno(safe_pwritev2(arg1, vec, arg3, low, high,
arg6));
unlock_iovec(vec, arg2, arg3, 0);
} else {
ret = -host_to_target_errno(errno);
}
}
return ret;
#endif
case TARGET_NR_getsid:
return get_errno(getsid(arg1));