1 files changed, 58 insertions, 0 deletions
diff --git a/tools/include/nolibc/unistd.h b/tools/include/nolibc/unistd.h
index 79599ceef45d..a264a20da13d 100644
--- a/tools/include/nolibc/unistd.h
+++ b/tools/include/nolibc/unistd.h
@@ -73,6 +73,48 @@ int ftruncate(int fd, off_t length)
 	return __sysret(_sys_ftruncate(fd, length));
 }
 
+/*
+ * char *getcwd(char *buf, size_t size);
+ */
+
+static __attribute__((unused))
+int _sys_getcwd(char *buf, size_t size)
+{
+	return __nolibc_syscall2(__NR_getcwd, buf, size);
+}
+
+static __attribute__((unused))
+char *getcwd(char *buf, size_t size)
+{
+	int ret;
+
+	/* Unlike other libc's we don't handle passing NULL for buf */
+	if (!buf || !size) {
+		SET_ERRNO(EINVAL);
+		return NULL;
+	}
+
+	ret = __sysret(_sys_getcwd(buf, size));
+
+	/* On error return NULL, __sysret() above will have set errno */
+	if (ret < 0)
+		return NULL;
+
+	/* Handle no path being written or the kernel putting
+	 * "(unreachable)" into the buffer instead of a path.
+	 * This matches what musl is doing.
+	 */
+	if (ret == 0 || buf[0] != '/') {
+		SET_ERRNO(ENOENT);
+		return NULL;
+	}
+
+	/* ret must be the number of bytes written at this point,
+	 * so return the pointer to buf.
+	 */
+	return buf;
+}
+
 static __attribute__((unused))
 int msleep(unsigned int msecs)
 {
@@ -86,6 +128,22 @@ int msleep(unsigned int msecs)
 		return 0;
 }
 
+/*
+ * ssize_t readlink(const char *path, char *buf, size_t bufsiz);
+ */
+
+static __attribute__((unused))
+ssize_t _sys_readlink(const char *path, char *buf, size_t bufsiz)
+{
+	return __nolibc_syscall4(__NR_readlinkat, AT_FDCWD, path, buf, bufsiz);
+}
+
+static __attribute__((unused))
+ssize_t readlink(const char *path, char *buf, size_t bufsiz)
+{
+	return __sysret(_sys_readlink(path, buf, bufsiz));
+}
+
 static __attribute__((unused))
 unsigned int sleep(unsigned int seconds)
 {