usr: libc: Add POSIX getpid() and getppid()

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

4 files changed, 50 insertions, 0 deletions

diff --git a/lib/libc/include/unistd.h b/lib/libc/include/unistd.h
index 8c82eb8..01c4abc 100644
--- a/lib/libc/include/unistd.h
+++ b/lib/libc/include/unistd.h
@@ -52,6 +52,9 @@ int close(int fd);
 int access(const char *path, int mode);
 off_t lseek(int fildes, off_t offset, int whence);
 
+pid_t getpid(void);
+pid_t getppid(void);
+
 __END_DECLS
 
 #endif  /* !_UNISTD_H */
diff --git a/lib/libc/src/unistd/getpid.c b/lib/libc/src/unistd/getpid.c
new file mode 100644
index 0000000..5770495
--- /dev/null
+++ b/lib/libc/src/unistd/getpid.c
@@ -0,0 +1,43 @@
+/*
+ * Copyright (c) 2023-2025 Ian Marco Moffett and the Osmora Team.
+ * 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 Hyra 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>
+
+pid_t
+getpid(void)
+{
+    return syscall(SYS_getpid);
+}
+
+pid_t
+getppid(void)
+{
+    return syscall(SYS_getppid);
+}
diff --git a/sys/include/sys/syscall.h b/sys/include/sys/syscall.h
index 08bd989..3650e7a 100644
--- a/sys/include/sys/syscall.h
+++ b/sys/include/sys/syscall.h
@@ -54,6 +54,8 @@
 #define SYS_lseek   13
 #define SYS_sleep   14
 #define SYS_inject  15
+#define SYS_getpid  16
+#define SYS_getppid 17
 
 #if defined(_KERNEL)
 /* Syscall return value and arg type */
diff --git a/sys/kern/kern_syscall.c b/sys/kern/kern_syscall.c
index 292fa56..739dd7f 100644
--- a/sys/kern/kern_syscall.c
+++ b/sys/kern/kern_syscall.c
@@ -54,6 +54,8 @@ scret_t(*g_sctab[])(struct syscall_args *) = {
     sys_lseek,  /* SYS_lseek */
     sys_sleep,  /* SYS_sleep */
     sys_inject, /* SYS_inject */
+    sys_getpid, /* SYS_getpid */
+    sys_getppid /* SYS_getppid */
 };
 
 const size_t MAX_SYSCALLS = NELEM(g_sctab);