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[component] add openat syscall. (#7488)

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This commit is contained in:
geniusgogo
2023-05-15 20:40:27 +08:00
committed by GitHub
parent 8a1260c56a
commit 0e4a3142a8
3 changed files with 136 additions and 0 deletions
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components/lwp/lwp_syscall.c
+42
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@@ -518,6 +518,47 @@ sysret_t sys_open(const char *name, int flag, ...)
#endif
}
/* syscall: "open" ret: "int" args: "const char *" "mode_t" "mode" */
sysret_t sys_openat(int dirfd, const char *name, int flag, mode_t mode)
{
#ifdef ARCH_MM_MMU
int ret = -1;
int err = 0;
rt_size_t len = 0;
char *kname = RT_NULL;
len = lwp_user_strlen(name, &err);
if (!len || err != 0)
{
return -EINVAL;
}
kname = (char *)kmem_get(len + 1);
if (!kname)
{
return -ENOMEM;
}
lwp_get_from_user(kname, (void *)name, len + 1);
ret = openat(dirfd, kname, flag, mode);
if (ret < 0)
{
ret = GET_ERRNO();
}
kmem_put(kname);
return ret;
#else
if (!lwp_user_accessable((void *)name, 1))
{
return -EFAULT;
}
int ret = openat(dirfd, name, flag, mode);
return (ret < 0 ? GET_ERRNO() : ret);
#endif
}
/* syscall: "close" ret: "int" args: "int" */
sysret_t sys_close(int fd)
{
@@ -4995,6 +5036,7 @@ const static struct rt_syscall_def func_table[] =
SYSCALL_SIGN(sys_statfs64),
SYSCALL_SIGN(sys_fstatfs),
SYSCALL_SIGN(sys_fstatfs64),
SYSCALL_SIGN(sys_openat), /* 175 */
};
const void *lwp_get_sys_api(rt_uint32_t number)