[PULL 12/41] bsd-user: Add os-file.h with chflagsat, close_range, and more

[Warner Losh <imp@bsdimp.com>]

Add FreeBSD-specific file operation shims: chflagsat, close_range,
copy_file_range, and __specialfd. Also add the safe_copy_file_range and
safe_ppoll syscall wrappers and the target_specialfd_eventfd type
definitions.

Signed-off-by: Stacey Son <sson@FreeBSD.org>
Assisted-by: Claude Opus 4.6 (1M context)
Reviewed-by: Pierrick Bouvier <pierrick.bouvier@oss.qualcomm.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Acked-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Warner Losh <imp@bsdimp.com>
---
 bsd-user/freebsd/os-file.h    | 103 ++++++++++++++++++++++++++++++++++
 bsd-user/freebsd/os-syscall.c |  25 +++++++++
 bsd-user/syscall_defs.h       |  10 ++++
 3 files changed, 138 insertions(+)
 create mode 100644 bsd-user/freebsd/os-file.h

diff --git a/bsd-user/freebsd/os-file.h b/bsd-user/freebsd/os-file.h
new file mode 100644
index 0000000000..d5d91336ea
--- /dev/null
+++ b/bsd-user/freebsd/os-file.h
@@ -0,0 +1,103 @@
+/*
+ * FreeBSD file related system call shims and definitions
+ *
+ * Copyright (c) 2014 Stacey D. Son
+ *
+ * SPDX-License-Identifier: GPL-2.0-or-later
+ */
+#ifndef FREEBSD_OS_FILE_H
+#define FREEBSD_OS_FILE_H
+
+#include <sys/specialfd.h>
+
+/*
+ * Asynchronous I/O.
+ */
+
+/* chflagsat(2) */
+static inline abi_long do_bsd_chflagsat(int fd, abi_ulong path,
+        abi_ulong flags, int atflags)
+{
+    abi_long ret;
+    void *p;
+
+    LOCK_PATH(p, path);
+    ret = get_errno(chflagsat(fd, p, flags, atflags)); /* XXX path(p)? */
+    UNLOCK_PATH(p, path);
+
+    return ret;
+}
+
+/* close_range(2) */
+static inline abi_long do_freebsd_close_range(unsigned int lowfd,
+    unsigned int highfd, int flags)
+{
+
+    return get_errno(close_range(lowfd, highfd, flags));
+}
+
+ssize_t safe_copy_file_range(int, off_t *, int, off_t *, size_t, unsigned int);
+
+/* copy_file_range(2) */
+static inline abi_long do_freebsd_copy_file_range(int infd,
+    abi_ulong inofftp, int outfd, abi_ulong outofftp, size_t len,
+    unsigned int flags)
+{
+    off_t inoff, outoff, *inp, *outp;
+    abi_long ret;
+
+    inp = outp = NULL;
+    if (inofftp != 0 && !access_ok(VERIFY_WRITE, inofftp, sizeof(off_t))) {
+        return -TARGET_EFAULT;
+    } else if (inofftp != 0) {
+        inoff = tswap64(*(off_t *)g2h_untagged(inofftp));
+        inp = &inoff;
+    }
+    if (outofftp != 0 && !access_ok(VERIFY_WRITE, outofftp, sizeof(off_t))) {
+        return -TARGET_EFAULT;
+    } else if (outofftp != 0) {
+        outoff = tswap64(*(off_t *)g2h_untagged(outofftp));
+        outp = &outoff;
+    }
+
+    ret = get_errno(safe_copy_file_range(infd, inp, outfd, outp, len,
+        flags));
+
+    if (!is_error(ret)) {
+        if (inofftp != 0) {
+            *(off_t *)g2h_untagged(inofftp) = tswap64(inoff);
+        }
+        if (outofftp != 0) {
+            *(off_t *)g2h_untagged(outofftp) = tswap64(outoff);
+        }
+    }
+    return ret;
+}
+
+static inline abi_long do_freebsd___specialfd(int type, abi_ulong req,
+    size_t len)
+{
+    abi_long ret;
+
+    ret = -TARGET_EINVAL;
+    switch (type) {
+    case TARGET_SPECIALFD_EVENT: {
+        struct specialfd_eventfd evfd;
+        struct target_specialfd_eventfd *target_eventfd;
+
+        if (!lock_user_struct(VERIFY_READ, target_eventfd, req, 1)) {
+            return -TARGET_EFAULT;
+        }
+
+        evfd.initval = tswap32(target_eventfd->initval);
+        evfd.flags = tswap32(target_eventfd->flags);
+        ret = get_errno(syscall(SYS___specialfd, type, &evfd, sizeof(evfd)));
+        unlock_user_struct(target_eventfd, req, 0);
+        break;
+    }
+    }
+
+    return ret;
+}
+
+#endif /* FREEBSD_OS_FILE_H */
diff --git a/bsd-user/freebsd/os-syscall.c b/bsd-user/freebsd/os-syscall.c
index 06148fe3ce..4fc230e8e5 100644
--- a/bsd-user/freebsd/os-syscall.c
+++ b/bsd-user/freebsd/os-syscall.c
@@ -44,6 +44,7 @@
 #include "os-stat.h"
 #include "os-proc.h"
 #include "os-signal.h"
+#include "os-file.h"
 #include "os-misc.h"
 
 /* I/O */
@@ -65,6 +66,9 @@ safe_syscall3(ssize_t, writev, int, fd, const struct iovec *, iov, int, iovcnt);
 safe_syscall4(ssize_t, pwritev, int, fd, const struct iovec *, iov, int, iovcnt,
     off_t, offset);
 
+safe_syscall6(ssize_t, copy_file_range, int, infd, off_t *, inoffp, int, outfd,
+    off_t *, outoffp, size_t, len, unsigned int, flags);
+
 /* used in os-proc */
 safe_syscall4(pid_t, wait4, pid_t, wpid, int *, status, int, options,
     struct rusage *, rusage);
@@ -692,6 +696,27 @@ static abi_long freebsd_syscall(CPUArchState *env, int num, abi_long arg1,
         ret = do_bsd_undelete(arg1);
         break;
 
+    case TARGET_FREEBSD_NR_chflagsat: /* chflagsat(2) */
+        ret = do_bsd_chflagsat(arg1, arg2, arg3, arg4);
+        break;
+
+    case TARGET_FREEBSD_NR_close_range: /* close_range(2) */
+        ret = do_freebsd_close_range(arg1, arg2, arg3);
+        break;
+
+    case TARGET_FREEBSD_NR___realpathat:
+        /* __realpathat(2) (XXX no realpathat()) */
+        ret = do_freebsd_realpathat(arg1, arg2, arg3, arg4, arg5);
+        break;
+
+    case TARGET_FREEBSD_NR_copy_file_range:
+        ret = do_freebsd_copy_file_range(arg1, arg2, arg3, arg4, arg5, arg6);
+        break;
+
+    case TARGET_FREEBSD_NR___specialfd:
+        ret = do_freebsd___specialfd(arg1, arg2, arg3);
+        break;
+
         /*
          * ioctl(2)
          */
diff --git a/bsd-user/syscall_defs.h b/bsd-user/syscall_defs.h
index 47aa01fbb5..88dd7a763a 100644
--- a/bsd-user/syscall_defs.h
+++ b/bsd-user/syscall_defs.h
@@ -418,6 +418,16 @@ struct target_freebsd_flock {
 /* user: vfork(2) semantics, clear signals */
 #define TARGET_RFSPAWN (1U << 31)
 
+/* sys/specialfd.h */
+enum target_specialfd_type {
+    TARGET_SPECIALFD_EVENT         = 1,
+};
+
+struct target_specialfd_eventfd {
+    unsigned int initval;
+    int flags;
+};
+
 /*
  *  sys/uuid.h
  */
-- 
2.55.0