libc

commit 0ddeaa888fbb0e98229c24619fddd5d44dac3ede
parent 3d10790d4689db3a8b55c253087ca75326f3e5d7
Author: evenfri <evenfri256@gmail.com>
Date:   Mon, 10 Aug 2026 03:56:18 +0800

add utime

Diffstat:
M
libc.h
 | 
10
++++++++++
M
mkfile
 | 
1
+
A
utime.c
 | 
15
+++++++++++++++

3 files changed, 26 insertions(+), 0 deletions(-)
diff --git a/libc.h b/libc.h
@@ -32,6 +32,7 @@ struct linux_dirent64 {
 #define o_wronly 01
 #define o_rdwr 02
 #define o_creat 0100
+#define o_excl 0x800
 #define o_directory 0200000
 
 /* syscall numbers */
@@ -42,6 +43,7 @@ struct linux_dirent64 {
 #define sys_mmap 9
 #define sys_munmap 11
 #define sys_brk 12
+#define sys_utime 30
 #define sys_clone 56
 #define sys_execve 59
 #define sys_exit 60
@@ -100,6 +102,14 @@ void free(void *ptr);
 void* calloc(size_t nmemb, size_t size);
 void* realloc(void *ptr, size_t size);
 
+/* utime */
+struct utimbuf {
+  int actime;
+  int modtime;
+};
+
+int utime(const char *path, const struct utimbuf *times);
+
 /* string functions */
 size_t strlen(const char *str);
 char *strchr(const char *s, int c);
diff --git a/mkfile b/mkfile
@@ -27,6 +27,7 @@ ofiles =  start.$o \
           getcwd.$o \
           chdir.$o \
           getdents.$o \
+          utime.$o \
           errno.$o \
           strlen.$o \
           strchr.$o \
diff --git a/utime.c b/utime.c
@@ -0,0 +1,15 @@
+/*
+ * utime.c - update timestamp of file
+ * Copyright (C) 2026. All rights reserved.
+ */
+
+#include "libc.h"
+
+int utime(const char *path, const struct utimbuf *times) {
+  int ret = syscall(sys_utime, path, times);
+  if (ret < 0) {
+    errno = -ret;
+    return -1;
+  }
+  return ret;
+}