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core: osmo_io: Introduce API osmo_io_get_backend()

It came up several times already that it's difficult figuring out the
osmo-io backend a process is actually using.
Add this API so that we can display the osmo-io backend through VTY
command in a follow-up commit.

Related: OS#6740
Change-Id: I9432efd6cb0453d7ab42d71765e897db6bd4c787
---
M TODO-RELEASE
M include/osmocom/core/osmo_io.h
M src/core/libosmocore.map
M src/core/osmo_io.c
4 files changed, 11 insertions(+), 0 deletions(-)

git pull ssh://gerrit.osmocom.org:29418/libosmocore refs/changes/40/39940/1

diff --git a/TODO-RELEASE b/TODO-RELEASE
index 0ed7189..5d97425 100644
--- a/TODO-RELEASE
+++ b/TODO-RELEASE
@@ -7,3 +7,4 @@
 # If any interfaces have been added since the last public release: c:r:a + 1.
 # If any interfaces have been removed or changed since the last public release: c:r:0.
 #library	what			description / commit summary line
+libosmocore add API osmo_io_get_backend()
\ No newline at end of file
diff --git a/include/osmocom/core/osmo_io.h b/include/osmocom/core/osmo_io.h
index f4bfec4..c8b8517 100644
--- a/include/osmocom/core/osmo_io.h
+++ b/include/osmocom/core/osmo_io.h
@@ -79,6 +79,8 @@
 	OSMO_IO_BACKEND_IO_URING,
 };
 
+enum osmo_io_backend osmo_io_get_backend(void);
+
 extern const struct value_string osmo_io_backend_names[];
 /*! return the string name of an osmo_io_backend */
 static inline const char *osmo_io_backend_name(enum osmo_io_backend val)
diff --git a/src/core/libosmocore.map b/src/core/libosmocore.map
index cd5dc94..b48c4e6 100644
--- a/src/core/libosmocore.map
+++ b/src/core/libosmocore.map
@@ -256,6 +256,7 @@
 osmo_init_logging2;
 osmo_int_to_float_str_buf;
 osmo_int_to_float_str_c;
+osmo_io_get_backend;
 osmo_io_backend_names;
 osmo_iofd_close;
 osmo_iofd_free;
diff --git a/src/core/osmo_io.c b/src/core/osmo_io.c
index 65c9b33..9d377a8 100644
--- a/src/core/osmo_io.c
+++ b/src/core/osmo_io.c
@@ -122,6 +122,13 @@
 	osmo_iofd_init();
 }
 
+/*! Obtain the osmo_io_backend in use by the process
+ *  \returns The osmo_io backend which was configured at startup time */
+enum osmo_io_backend osmo_io_get_backend(void)
+{
+	return g_io_backend;
+}
+
 /*! Allocate the msghdr.
  *  \param[in] iofd the osmo_io file structure
  *  \param[in] action the action this msg(hdr) is for (read, write, ..)

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