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Re: [Qemu-devel] [PATCH] linux-user: fix inotify
From: |
Laurent Vivier |
Subject: |
Re: [Qemu-devel] [PATCH] linux-user: fix inotify |
Date: |
Tue, 25 Apr 2017 18:33:41 +0200 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.0 |
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Laurent
Le 02/03/2017 à 01:54, Laurent Vivier a écrit :
> When a fd is opened using inotify_init(), a read provides
> one or more inotify_event structures:
>
> struct inotify_event {
> int wd;
> uint32_t mask;
> uint32_t cookie;
> uint32_t len;
> char name[];
> };
>
> The integer fields must be byte-swapped to the target endianness.
>
> Signed-off-by: Laurent Vivier <address@hidden>
> ---
> linux-user/syscall.c | 29 +++++++++++++++++++++++++++++
> 1 file changed, 29 insertions(+)
>
> diff --git a/linux-user/syscall.c b/linux-user/syscall.c
> index cec8428..c2c4f3a 100644
> --- a/linux-user/syscall.c
> +++ b/linux-user/syscall.c
> @@ -7671,6 +7671,33 @@ static target_timer_t get_timer_id(abi_long arg)
> return timerid;
> }
>
> +#if (defined(TARGET_NR_inotify_init) && defined(__NR_inotify_init)) || \
> + (defined(CONFIG_INOTIFY1) && defined(TARGET_NR_inotify_init1) && \
> + defined(__NR_inotify_init1))
> +static abi_long host_to_target_data_inotify(void *buf, size_t len)
> +{
> + struct inotify_event *ev;
> + int i;
> + uint32_t name_len;
> +
> + for (i = 0; i < len; i += sizeof(struct inotify_event) + name_len) {
> + ev = (struct inotify_event *)((char *)buf + i);
> + name_len = ev->len;
> +
> + ev->wd = tswap32(ev->wd);
> + ev->mask = tswap32(ev->mask);
> + ev->cookie = tswap32(ev->cookie);
> + ev->len = tswap32(name_len);
> + }
> +
> + return len;
> +}
> +
> +static TargetFdTrans target_inotify_trans = {
> + .host_to_target_data = host_to_target_data_inotify,
> +};
> +#endif
> +
> /* do_syscall() should always have a single exit point at the end so
> that actions, such as logging of syscall results, can be performed.
> All errnos that do_syscall() returns must be -TARGET_<errcode>. */
> @@ -11694,6 +11721,7 @@ abi_long do_syscall(void *cpu_env, int num, abi_long
> arg1,
> #if defined(TARGET_NR_inotify_init) && defined(__NR_inotify_init)
> case TARGET_NR_inotify_init:
> ret = get_errno(sys_inotify_init());
> + fd_trans_register(ret, &target_inotify_trans);
> break;
> #endif
> #ifdef CONFIG_INOTIFY1
> @@ -11701,6 +11729,7 @@ abi_long do_syscall(void *cpu_env, int num, abi_long
> arg1,
> case TARGET_NR_inotify_init1:
> ret = get_errno(sys_inotify_init1(target_to_host_bitmask(arg1,
> fcntl_flags_tbl)));
> + fd_trans_register(ret, &target_inotify_trans);
> break;
> #endif
> #endif
>
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