7 files changed, 172 insertions, 0 deletions
diff --git a/src/lib/libc/include/stdio.h b/src/lib/libc/include/stdio.h
index c8b7c10..31d59a5 100644
--- a/src/lib/libc/include/stdio.h
+++ b/src/lib/libc/include/stdio.h
@@ -53,6 +53,13 @@ int vsnprintf(char *s, size_t size, const char *fmt, va_list ap);
 int snprintf(char *s, size_t size, const char *fmt, ...);
 
 /*
+ * Write a character to stdout
+ *
+ * @c: Character to write
+ */
+int putchar(int c);
+
+/*
  * Print a formatted string
  */
 int printf(const char *__restrict fmt, ...);
diff --git a/src/lib/libc/include/string.h b/src/lib/libc/include/string.h
index 1572400..360af12 100644
--- a/src/lib/libc/include/string.h
+++ b/src/lib/libc/include/string.h
@@ -93,4 +93,13 @@ void *memset(void *s, int c, size_t n);
  */
 char *itoa(int64_t value, char *buf, int base);
 
+/*
+ * Compare two byte streams
+ *
+ * @s1: Stream one
+ * @s2: Stream two
+ * @n: Max bytes to compare
+ */
+int memcmp(const void *s1, const void *s2, size_t n);
+
 #endif  /* _STRING_H */
diff --git a/src/lib/libc/include/unistd.h b/src/lib/libc/include/unistd.h
index fa7f951..b668d5b 100644
--- a/src/lib/libc/include/unistd.h
+++ b/src/lib/libc/include/unistd.h
@@ -48,6 +48,15 @@
 int open(const char *path, int flags);
 
 /*
+ * Close a file using its file descriptor
+ *
+ * @fd: File descriptor to close
+ *
+ * Returns zero on success
+ */
+int close(int fd);
+
+/*
  * POSIX write system call
  *
  * @fd: File descriptor to write at
@@ -56,4 +65,13 @@ int open(const char *path, int flags);
  */
 ssize_t write(int fd, const void *buf, size_t count);
 
+/*
+ * POSIX read system call
+ *
+ * @fd: File descriptor to read
+ * @buf: Buffer to read into
+ * @count: Number of bytes to read
+ */
+ssize_t read(int fd, void *buf, size_t count);
+
 #endif  /* _UNISTD_H */
diff --git a/src/lib/libc/src/stdio/puts.c b/src/lib/libc/src/stdio/puts.c
index 6446e10..021bf89 100644
--- a/src/lib/libc/src/stdio/puts.c
+++ b/src/lib/libc/src/stdio/puts.c
@@ -46,3 +46,10 @@ puts(const char *s)
     write(STDOUT_FILENO, &ch_lf, 1);
     return slen + 1;
 }
+
+int
+putchar(int c)
+{
+    write(STDOUT_FILENO, &c, 1);
+    return c;
+}
diff --git a/src/lib/libc/src/string/memcmp.c b/src/lib/libc/src/string/memcmp.c
new file mode 100644
index 0000000..2dab02d
--- /dev/null
+++ b/src/lib/libc/src/string/memcmp.c
@@ -0,0 +1,45 @@
+/*
+ * 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 <string.h>
+
+int
+memcmp(const void *s1, const void *s2, size_t n)
+{
+    if (n != 0) {
+        const unsigned char *p1 = s1, *p2 = s2;
+
+        do {
+            if (*p1++ != *p2++) {
+                return (*--p1 - *--p2);
+            }
+        } while (--n != 0);
+    }
+    return 0;
+}
diff --git a/src/lib/libc/src/unistd/close.c b/src/lib/libc/src/unistd/close.c
new file mode 100644
index 0000000..125bba0
--- /dev/null
+++ b/src/lib/libc/src/unistd/close.c
@@ -0,0 +1,40 @@
+/*
+ * 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>
+
+int
+close(int fd)
+{
+    return syscall(
+        SYS_close,
+        fd
+    );
+}
diff --git a/src/lib/libc/src/unistd/read.c b/src/lib/libc/src/unistd/read.c
new file mode 100644
index 0000000..5c45c09
--- /dev/null
+++ b/src/lib/libc/src/unistd/read.c
@@ -0,0 +1,46 @@
+/*
+ * 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
+read(int fd, void *buf, size_t count)
+{
+    if (buf == NULL || count == 0) {
+        return -1;
+    }
+
+    return syscall(
+        SYS_read,
+        fd,
+        (uintptr_t)buf,
+        count
+    );
+}