linux-user: factor out reading of /proc/self/maps

Unfortunately reading /proc/self/maps is still considered the gold
standard for a process finding out about it's own memory layout. As we
will want this data in other contexts soon factor out the code to read
and parse the data. Rather than just blindly copying the existing
sscanf based code we use a more modern glib version of the parsing
code to make a more general purpose map structure.

Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Message-Id: <20200403191150.863-9-alex.bennee@linaro.org>

1 files changed, 44 insertions, 0 deletions

diff --git a/include/qemu/selfmap.h b/include/qemu/selfmap.h
new file mode 100644
index 0000000000..8382c4c779
--- /dev/null
+++ b/include/qemu/selfmap.h
@@ -0,0 +1,44 @@
+/*
+ * Utility functions to read our own memory map
+ *
+ * Copyright (c) 2020 Linaro Ltd
+ *
+ * SPDX-License-Identifier: GPL-2.0-or-later
+ */
+
+#ifndef _SELFMAP_H_
+#define _SELFMAP_H_
+
+typedef struct {
+    unsigned long start;
+    unsigned long end;
+
+    /* flags */
+    bool is_read;
+    bool is_write;
+    bool is_exec;
+    bool is_priv;
+
+    unsigned long offset;
+    gchar *dev;
+    uint64_t inode;
+    gchar *path;
+} MapInfo;
+
+
+/**
+ * read_self_maps:
+ *
+ * Read /proc/self/maps and return a list of MapInfo structures.
+ */
+GSList *read_self_maps(void);
+
+/**
+ * free_self_maps:
+ * @info: a GSlist
+ *
+ * Free a list of MapInfo structures.
+ */
+void free_self_maps(GSList *info);
+
+#endif /* _SELFMAP_H_ */