add *chmod, and *chown syscalls

libc/CMakeLists.txt

@@ -33,6 +33,8 @@ add_library(
     ${CMAKE_SOURCE_DIR}/libc/src/sys/utsname.c
     ${CMAKE_SOURCE_DIR}/libc/src/sys/mman.c
     ${CMAKE_SOURCE_DIR}/libc/src/sys/ioctl.c
+    ${CMAKE_SOURCE_DIR}/libc/src/unistd/chmod.c
+    ${CMAKE_SOURCE_DIR}/libc/src/unistd/chown.c
     ${CMAKE_SOURCE_DIR}/libc/src/unistd/creat.c
     ${CMAKE_SOURCE_DIR}/libc/src/unistd/getppid.c
     ${CMAKE_SOURCE_DIR}/libc/src/unistd/getpid.c

libc/inc/sys/unistd.h

@@ -288,3 +288,41 @@ int dup(int fd);
 /// previous request would have generated a SIGALRM signal. Otherwise, alarm()
 /// shall return 0.
 unsigned alarm(int seconds);
+
+/// @brief Change the file's mode bits.
+/// @param pathname The pathname of the file to change mode.
+/// @param mode The mode bits to set.
+/// @return On success, 0 is returned.
+///         On error, -1 is returned, and errno is set appropriately.
+int chmod(const char *pathname, mode_t mode);
+
+/// @brief Change the file's mode bits.
+/// @param fd The fd pointing to the opened file.
+/// @param mode The mode bits to set.
+/// @return On success, 0 is returned.
+///         On error, -1 is returned, and errno is set appropriately.
+int fchmod(int fd, mode_t mode);
+
+/// @brief Change the owner and group of a file.
+/// @param pathname The pathname of the file to change.
+/// @param owner The new owner to set.
+/// @param owner The new group to set.
+/// @return On success, 0 is returned.
+///         On error, -1 is returned, and errno is set appropriately.
+int chown(const char *pathname, uid_t owner, gid_t group);
+
+/// @brief Change the owner and group of a file.
+/// @param fd The fd pointing to the opened file.
+/// @param owner The new owner to set.
+/// @param owner The new group to set.
+/// @return On success, 0 is returned.
+///         On error, -1 is returned, and errno is set appropriately.
+int fchown(int fd, uid_t owner, gid_t group);
+
+/// @brief Change the owner and group of a file.
+/// @param pathname The pathname of the file to change.
+/// @param owner The new owner to set.
+/// @param owner The new group to set.
+/// @return On success, 0 is returned.
+///         On error, -1 is returned, and errno is set appropriately.
+int lchown(const char *pathname, uid_t owner, gid_t group);

libc/src/unistd/chmod.c

@@ -0,0 +1,12 @@
+/// @file   chmod.c
+/// @brief
+/// @copyright (c) 2024 This file is distributed under the MIT License.
+/// See LICENSE.md for details.
+
+#include "sys/unistd.h"
+#include "sys/errno.h"
+#include "system/syscall_types.h"
+
+_syscall2(int, chmod, const char *, pathname, mode_t, mode)
+
+_syscall2(int, fchmod, int, fd, mode_t, mode)

libc/src/unistd/chown.c

@@ -0,0 +1,14 @@
+/// @file   chown.c
+/// @brief
+/// @copyright (c) 2024 This file is distributed under the MIT License.
+/// See LICENSE.md for details.
+
+#include "sys/unistd.h"
+#include "sys/errno.h"
+#include "system/syscall_types.h"
+
+_syscall3(int, chown, const char *, pathname, uid_t, owner, gid_t, group)
+
+_syscall3(int, lchown, const char *, pathname, uid_t, owner, gid_t, group)
+
+_syscall3(int, fchown, int, fd, uid_t, owner, gid_t, group)