libc: unistd: Add write() system call wrapper

Signed-off-by: Ian Moffett <ian@osmora.org>

2 files changed, 48 insertions, 0 deletions

diff --git a/src/lib/libc/include/unistd.h b/src/lib/libc/include/unistd.h
index 9cf48bc..609fa0d 100644
--- a/src/lib/libc/include/unistd.h
+++ b/src/lib/libc/include/unistd.h
@@ -30,9 +30,20 @@
 #ifndef _UNISTD_H 1
 #define _UNISTD_H 1
 
+#include <stddef.h>
+
 /* Standard stream file numbers */
 #define STDIN_FILENO    0
 #define STDOUT_FILENO   1
 #define STDERR_FILENO   2
 
+/*
+ * POSIX write system call
+ *
+ * @fd: File descriptor to write at
+ * @buf: Buffer to write
+ * @count: Number of bytes within the buffer to write
+ */
+ssize_t write(int fd, const void *buf, size_t count);
+
 #endif  /* _UNISTD_H */
diff --git a/src/lib/libc/src/unistd/write.c b/src/lib/libc/src/unistd/write.c
new file mode 100644
index 0000000..04f4f6d
--- /dev/null
+++ b/src/lib/libc/src/unistd/write.c
@@ -0,0 +1,37 @@
+/*
+ * Copyright (c) 2025 Ian Marco Moffett and L5 engineers
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ *    this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of the project nor the names of its
+ *    contributors may be used to endorse or promote products derived from
+ *    this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <sys/syscall.h>
+#include <unistd.h>
+
+ssize_t
+write(int fd, const void *buf, size_t count)
+{
+    return syscall(SYS_write, fd, (uintptr_t)buf, count);
+}