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authorRichard Purdie <richard.purdie@linuxfoundation.org>2021-10-30 18:57:57 +0100
committerRichard Purdie <richard.purdie@linuxfoundation.org>2021-10-30 18:59:30 +0100
commitd34f2f6cedccf8488730001bcbde6bb7499f8814 (patch)
treec9c1eed34cd5db33c1ede15b65a4af2e308557be
parent0cda3ba5f94aed8d50652a99ee9c502975aa2926 (diff)
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ports/linux: Add wrapper for fcntl64()
Add a wrapper for the fcntl64 glibc function based on the fcntl wrapper which is effectively the same. Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
-rw-r--r--ports/linux/guts/fcntl64.c99
-rw-r--r--ports/linux/wrapfuncs.in1
2 files changed, 100 insertions, 0 deletions
diff --git a/ports/linux/guts/fcntl64.c b/ports/linux/guts/fcntl64.c
new file mode 100644
index 0000000..99de43d
--- /dev/null
+++ b/ports/linux/guts/fcntl64.c
@@ -0,0 +1,99 @@
+/*
+ * Copyright (c) 2008-2010 Wind River Systems; see
+ * guts/COPYRIGHT for information.
+ *
+ * SPDX-License-Identifier: LGPL-2.1-only
+ *
+ * static int
+ * wrap_fcntl64(int fd, int cmd, ...struct flock *lock) {
+ * int rc = -1;
+ */
+#if !defined(F_GETPIPE_SZ)
+#define F_GETPIPE_SZ (1032)
+#endif
+
+#if F_GETPIPE_SZ != 1032
+#error System F_GETPIPE_SZ has unexpected value
+#endif
+
+#if !defined(F_SETPIPE_SZ)
+#define F_SETPIPE_SZ (1031)
+#endif
+
+#if F_SETPIPE_SZ != 1031
+#error System F_SETPIPE_SZ has unexpected value
+#endif
+
+ long arg;
+ int save_errno;
+
+ /* we don't know whether we need lock or arg; grab both, which
+ * should be safe enough on Linuxy systems. */
+ va_start(ap, cmd);
+ arg = va_arg(ap, long);
+ va_end(ap);
+
+ switch (cmd) {
+ case F_DUPFD:
+#ifdef F_DUPFD_CLOEXEC
+ case F_DUPFD_CLOEXEC:
+#endif
+ /* actually do something */
+ rc = real_fcntl64(fd, cmd, arg);
+ save_errno = errno;
+ if (rc != -1) {
+ pseudo_debug(PDBGF_OP, "fcntl64_dup: %d->%d\n", fd, rc);
+ pseudo_client_op(OP_DUP, 0, fd, rc, 0, 0);
+ }
+ errno = save_errno;
+ break;
+ case F_SETPIPE_SZ:
+ /* actually do something */
+ rc = real_fcntl64(fd, cmd, arg);
+ break;
+ /* no argument: */
+ case F_GETFD:
+ case F_GETFL:
+ case F_GETOWN:
+ case F_GETSIG:
+ case F_GETLEASE:
+ case F_GETPIPE_SZ:
+ rc = real_fcntl64(fd, cmd);
+ break;
+ /* long argument */
+ case F_SETFD:
+ case F_SETFL:
+ case F_SETOWN:
+ case F_SETSIG:
+ case F_SETLEASE:
+ case F_NOTIFY:
+ rc = real_fcntl64(fd, cmd, arg);
+ break;
+ /* struct flock * argument */
+ case F_GETLK:
+ case F_SETLK:
+ case F_SETLKW:
+#ifdef F_OFD_GETLK
+ case F_OFD_GETLK:
+ case F_OFD_SETLK:
+ case F_OFD_SETLKW:
+#endif
+ rc = real_fcntl64(fd, cmd, lock);
+ break;
+#if defined(F_GETLK64) && (F_GETLK64 != F_GETLK)
+ /* the cast is safe, all struct pointers must smell the same */
+ case F_GETLK64:
+ case F_SETLK64:
+ case F_SETLKW64:
+ rc = real_fcntl64(fd, cmd, (struct flock64 *) lock);
+ break;
+#endif
+ default:
+ pseudo_diag("unknown fcntl64 argument %d, assuming long argument.\n",
+ cmd);
+ rc = real_fcntl64(fd, cmd, arg);
+ break;
+ }
+/* return rc;
+ * }
+ */
diff --git a/ports/linux/wrapfuncs.in b/ports/linux/wrapfuncs.in
index 793f5d8..97b16c2 100644
--- a/ports/linux/wrapfuncs.in
+++ b/ports/linux/wrapfuncs.in
@@ -13,6 +13,7 @@ int mknodat(int dirfd, const char *path, mode_t mode, dev_t dev); /* real_func=p
int __xmknod(int ver, const char *path, mode_t mode, dev_t *dev); /* flags=AT_SYMLINK_NOFOLLOW */
int __xmknodat(int ver, int dirfd, const char *path, mode_t mode, dev_t *dev); /* flags=AT_SYMLINK_NOFOLLOW */
int fcntl(int fd, int cmd, ...{struct flock *lock}); /* noignore_path=1 */
+int fcntl64(int fd, int cmd, ...{struct flock *lock}); /* noignore_path=1 */
# just so we know the inums of symlinks
char *canonicalize_file_name(const char *filename);
int eaccess(const char *path, int mode);