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 <laurent@vivier.eu>
---
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
--
2.9.3
On 03/01/2017 09:54 PM, Laurent Vivier wrote: > 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 <laurent@vivier.eu> Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org> > --- > 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 >
Ping? 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 <laurent@vivier.eu> > --- > 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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