meta: move photon/libc to root

libc/sys/horizon/unistd.c

@@ -0,0 +1,86 @@
+#include <magenta/object.h>
+#include <magenta/bootstrap.h>
+#include <magenta/errors.h>
+#include <unistd.h>
+#include <errno.h>
+#include <mio/fs.h>
+
+int open(const char *pathname, int flags, ...)
+{
+    int ret = mio_open(pathname, flags);
+    if (ret < 0) {
+        __set_errno(-ret);
+        return -1;
+    }
+
+    __set_errno(0);
+    return ret;
+}
+
+int openat(int dirfd, const char *pathname, int flags, ...)
+{
+    int ret = mio_openat(dirfd, pathname, flags);
+    if (ret < 0) {
+        __set_errno(-ret);
+        return -1;
+    }
+
+    __set_errno(0);
+    return ret;
+}
+
+ssize_t read(int fd, void *buf, size_t count)
+{
+    ssize_t ret = mio_read(fd, buf, count);
+    if (ret < 0) {
+        __set_errno(-(int)ret);
+        return -1;
+    }
+
+    __set_errno(0);
+    return ret;
+}
+
+ssize_t write(int fd, const void *buf, size_t count)
+{
+    ssize_t ret = mio_write(fd, buf, count);
+    if (ret < 0) {
+        __set_errno(-(int)ret);
+        return -1;
+    }
+
+    __set_errno(0);
+    return ret;
+}
+
+int close(int fd)
+{
+    int ret = mio_close(fd);
+    if (ret < 0) {
+        __set_errno(-ret);
+        return -1;
+    }
+
+    __set_errno(0);
+    return ret;
+}
+
+pid_t getpid(void)
+{
+    mx_info_task_t task_info;
+    mx_status_t status = mx_object_get_info(
+            mx_bootstrap_handle_get(MX_B_TASK_SELF),
+            MX_INFO_TASK,
+            &task_info, sizeof task_info);
+    return status == MX_OK ? task_info.leader_id : (pid_t)-1;
+}
+
+pid_t gettid(void)
+{
+    mx_info_task_t task_info;
+    mx_status_t status = mx_object_get_info(
+            mx_bootstrap_handle_get(MX_B_TASK_SELF),
+            MX_INFO_TASK,
+            &task_info, sizeof task_info);
+    return status == MX_OK ? task_info.id : (pid_t)-1;
+}