lib9p_util: Add a listing of coroutineslukeshu/proc

6 files changed, 206 insertions, 4 deletions

diff --git a/flashimg/cpu_main/main.c b/flashimg/cpu_main/main.c
index 40bf81e..4732982 100644
--- a/flashimg/cpu_main/main.c
+++ b/flashimg/cpu_main/main.c
@@ -37,6 +37,7 @@
 #include "usb_keyboard.h"
 
 /* 9P files */
+#include <util9p/coroutine.h>
 #include <util9p/nut.h>
 #include <util9p/static.h>
 #include <util9p/uptime.h>
@@ -119,12 +120,12 @@ static struct lib9p_srv_file root =
 		STATIC_DIR("harness",
 			API_FILE("flash.bin", flash,
 				.io = &flashio),
+			API_FILE("proc.txt", coroutine),
 			STATIC_FILE("rom.bin",
 				.data_start = (void*)0x00000000,
 				.data_size  = 16*1024),
 			API_FILE("uptime.txt", uptime),
 			// TODO: system.log
-			// TODO: proc.txt
 			// TODO: cpuinfo.txt
 			// TODO: ctl
 			),
diff --git a/lib9p_util/CMakeLists.txt b/lib9p_util/CMakeLists.txt
index 99dfbde..32e98de 100644
--- a/lib9p_util/CMakeLists.txt
+++ b/lib9p_util/CMakeLists.txt
@@ -6,6 +6,7 @@
 add_library(lib9p_util INTERFACE)
 target_include_directories(lib9p_util INTERFACE ${CMAKE_CURRENT_SOURCE_DIR}/include)
 target_sources(lib9p_util INTERFACE
+	coroutine.c
 	nut.c
 	static.c
 	uptime.c
diff --git a/lib9p_util/coroutine.c b/lib9p_util/coroutine.c
new file mode 100644
index 0000000..b9320a9
--- /dev/null
+++ b/lib9p_util/coroutine.c
@@ -0,0 +1,177 @@
+/* lib9p_util/coroutine.c - 9P access to libcr process information
+ *
+ * Copyright (C) 2025  Luke T. Shumaker <lukeshu@lukeshu.com>
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+
+#include <libcr/coroutine.h>
+#include <libmisc/fmt.h>
+#include <libmisc/heap.h>
+#include <util9p/static.h>
+
+#include <util9p/static.h>
+#include <util9p/coroutine.h>
+
+/******************************************************************************/
+
+LO_IMPLEMENTATION_C(lib9p_srv_file, struct coroutine_file, coroutine_file);
+
+static_assert(CONFIG_COROUTINE_NUM < 1000);
+
+#define MAX(a, b) ( ((a)>(b)) ? (a) : (b) )
+
+static_assert(sizeof(size_t) == 4 || sizeof(size_t) == 8);
+#define SIZE_MAX_BASE10_LEN (sizeof(size_t) == 4 ? 10 : 20)
+
+struct coroutine_fio {
+	struct coroutine_file   *parent;
+	size_t                   buf_len;
+	char buf[
+		 (3                                 +2 /* cid */
+		 +MAX(CONFIG_COROUTINE_NAME_LEN, 4) +2 /* name */
+		 +14                                +2 /* state; len("CR_INITIALIZING")=14 */
+		 +MAX(SIZE_MAX_BASE10_LEN, 9)       +2 /* stack_cap */
+		 +MAX(SIZE_MAX_BASE10_LEN, 9)       +2 /* stack_max */
+		 +MAX(SIZE_MAX_BASE10_LEN, 9)       +1 /* stack_cur */
+		  )*(CONFIG_COROUTINE_NUM+1)];
+
+};
+LO_IMPLEMENTATION_STATIC(lib9p_srv_fio, struct coroutine_fio, coroutine_fio);
+
+/* srv_file *******************************************************************/
+
+void coroutine_file_free(struct coroutine_file *self) {
+	assert(self);
+}
+struct lib9p_qid coroutine_file_qid(struct coroutine_file *self) {
+	assert(self);
+
+	return (struct lib9p_qid){
+		.type = LIB9P_QT_FILE,
+		.vers = 1,
+		.path = self->pathnum,
+	};
+}
+
+error coroutine_file_stat(struct coroutine_file *self, struct lib9p_srv_ctx *ctx, struct lib9p_srv_stat *out) {
+	assert(self);
+	assert(ctx);
+	assert(out);
+
+	*out = ((struct lib9p_srv_stat){
+		.qid                 = coroutine_file_qid(self),
+		.mode                = 0444,
+		.atime_sec           = UTIL9P_ATIME,
+		.mtime_sec           = UTIL9P_MTIME,
+		.size                = 0,
+		.name                = lib9p_str(self->name),
+		.owner_uid           = { .name = lib9p_str("root"), .num  = 0 },
+		.owner_gid           = { .name = lib9p_str("root"), .num  = 0 },
+		.last_modifier_uid   = { .name = lib9p_str("root"), .num  = 0 },
+		.extension           = lib9p_str(NULL),
+	});
+	return ERROR_NULL;
+}
+error coroutine_file_wstat(struct coroutine_file *self, struct lib9p_srv_ctx *ctx, struct lib9p_srv_stat) {
+	assert(self);
+	assert(ctx);
+
+	return error_new(E_POSIX_EROFS, "read-only part of filesystem");
+}
+error coroutine_file_remove(struct coroutine_file *self, struct lib9p_srv_ctx *ctx) {
+	assert(self);
+	assert(ctx);
+
+	return error_new(E_POSIX_EROFS, "read-only part of filesystem");
+}
+
+LIB9P_SRV_NOTDIR(, struct coroutine_file, coroutine_file);
+
+lib9p_srv_fio_or_error coroutine_file_fopen(struct coroutine_file *self, struct lib9p_srv_ctx *ctx,
+                                            bool LM_UNUSED(rd), bool LM_UNUSED(wr), bool LM_UNUSED(trunc)) {
+	assert(self);
+	assert(ctx);
+
+	struct coroutine_fio *ret = heap_alloc(1, struct coroutine_fio);
+	ret->parent = self;
+
+	return ERROR_NEW_VAL(lib9p_srv_fio, LO_BOX(lib9p_srv_fio, ret));
+}
+
+/* srv_fio ********************************************************************/
+
+static uint32_t coroutine_fio_iounit(struct coroutine_fio *self) {
+	assert(self);
+	return sizeof(self->buf);
+}
+
+static void coroutine_fio_iofree(struct coroutine_fio *self) {
+	assert(self);
+	heap_free(self);
+}
+
+static struct lib9p_qid coroutine_fio_ioqid(struct coroutine_fio *self) {
+	assert(self);
+	assert(self->parent);
+	return coroutine_file_qid(self->parent);
+}
+
+static error coroutine_fio_pread(struct coroutine_fio *self, struct lib9p_srv_ctx *ctx,
+                                 lo_interface io_writer dst, uint64_t byte_offset, uint32_t byte_count) {
+	assert(self);
+	assert(ctx);
+
+	if (byte_offset == 0 || self->buf_len == 0) {
+		struct fmt_buf _w = { .dat = self->buf, .cap = sizeof(self->buf) };
+		lo_interface fmt_dest w = lo_box_fmt_buf_as_fmt_dest(&_w);
+
+		size_t w_cid = 3;
+		size_t w_name = MAX(CONFIG_COROUTINE_NAME_LEN, strlen("name"));
+		size_t w_state = strlen("CR_INITIALZING");
+		size_t w_stack_cap = MAX(SIZE_MAX_BASE10_LEN, strlen("stack_cap"));
+		size_t w_stack_max = MAX(SIZE_MAX_BASE10_LEN, strlen("stack_max"));
+		size_t w_stack_cur = MAX(SIZE_MAX_BASE10_LEN, strlen("stack_cur"));
+
+		fmt_print(w,
+			  (ljust, w_cid, ' ', "cid"), "  ",
+			  (ljust, w_name, ' ', "name"), "  ",
+			  (ljust, w_state, ' ', "state"), "  ",
+			  (rjust, w_stack_cap, ' ', "stack_cap"), "  ",
+			  (rjust, w_stack_max, ' ', "stack_max"), "  ",
+			  (rjust, w_stack_cur, ' ', "stack_cur"), "\n");
+		for (cid_t cid = 1; cid <= CONFIG_COROUTINE_NUM; cid++) {
+			struct cr_cid_info info;
+			cr_cid_info(cid, &info);
+			if (info.state == CR_NONE)
+				continue;
+			fmt_print(w,
+				  (ljust, w_cid, ' ', cid), "  ",
+				  (ljust, w_name, ' ', (strn, info.name, sizeof(info.name))), "  ",
+				  (ljust, w_state, ' ', coroutine_state_str(info.state)), "  ",
+				  (rjust, w_stack_cap, ' ', info.stack_cap), "  ",
+				  (rjust, w_stack_max, ' ', info.stack_max), "  ",
+				  (rjust, w_stack_cur, ' ', info.stack_cur), "\n");
+		}
+		assert(_w.len <= _w.cap);
+		self->buf_len = _w.len;
+	}
+
+	if (byte_offset > (uint64_t)self->buf_len)
+		return error_new(E_POSIX_EINVAL, "offset is past end-of-file length");
+
+	size_t beg_off = (size_t)byte_offset;
+	size_t end_off = beg_off + (size_t)byte_count;
+	if (end_off > self->buf_len)
+		end_off = self->buf_len;
+	return io_write(dst, &((char *)(self->buf))[beg_off], end_off-beg_off).err;
+}
+
+static uint32_t_or_error coroutine_fio_pwrite(struct coroutine_fio *self, struct lib9p_srv_ctx *ctx,
+                                              const void *LM_UNUSED(buf),
+                                              uint32_t LM_UNUSED(byte_count),
+                                              uint64_t LM_UNUSED(byte_offset)) {
+	assert(self);
+	assert(ctx);
+
+	return ERROR_NEW_ERR(uint32_t, error_new(E_POSIX_EROFS, "read-only part of filesystem"));
+}
diff --git a/lib9p_util/include/util9p/coroutine.h b/lib9p_util/include/util9p/coroutine.h
new file mode 100644
index 0000000..00533a9
--- /dev/null
+++ b/lib9p_util/include/util9p/coroutine.h
@@ -0,0 +1,18 @@
+/* util9p/coroutine.h - 9P access to libcr process information
+ *
+ * Copyright (C) 2025  Luke T. Shumaker <lukeshu@lukeshu.com>
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+
+#ifndef _UTIL9P_COROUTINE_H_
+#define _UTIL9P_COROUTINE_H_
+
+#include <lib9p/srv.h>
+
+struct coroutine_file {
+	char            *name;
+	uint64_t         pathnum;
+};
+LO_IMPLEMENTATION_H(lib9p_srv_file, struct coroutine_file, coroutine_file);
+
+#endif /* _UTIL9P_COROUTINE_H_ */
diff --git a/lib9p_util/tests/demo_server.c b/lib9p_util/tests/demo_server.c
index cb6d5ee..28530f9 100644
--- a/lib9p_util/tests/demo_server.c
+++ b/lib9p_util/tests/demo_server.c
@@ -20,6 +20,7 @@
 #include <libhw/host_net.h>
 #include <libmisc/macro.h>
 
+#include <util9p/coroutine.h>
 #include <util9p/static.h>
 #include <util9p/uptime.h>
 #include <util9p/whoami.h>
@@ -77,6 +78,7 @@ static struct lib9p_srv_file root =
 		API_FILE(4, "uptime.txt", uptime),
 		API_FILE(5, "video.nut", nut,
 			.framebuffer = globals.framebuffer),
+		API_FILE(6, "proc.txt", coroutine),
 		);
 
 static lib9p_srv_file_or_error get_root(struct lib9p_srv_ctx *LM_UNUSED(ctx), struct lib9p_s LM_UNUSED(treename)) {
diff --git a/libcr/coroutine.c b/libcr/coroutine.c
index d776e90..a81ffbd 100644
--- a/libcr/coroutine.c
+++ b/libcr/coroutine.c
@@ -865,12 +865,15 @@ void cr_cid_info(cid_t cid, struct cr_cid_info *ret) {
 #if CONFIG_COROUTINE_VALGRIND
 		VALGRIND_DISABLE_ERROR_REPORTING;
 #endif
-		uint8_t v = stack[i];
+		if (stack[i] != stack_pattern[i%sizeof(stack_pattern)]) {
 #if CONFIG_COROUTINE_VALGRIND
-		VALGRIND_ENABLE_ERROR_REPORTING;
+			VALGRIND_ENABLE_ERROR_REPORTING;
 #endif
-		if (v != stack_pattern[i%sizeof(stack_pattern)])
 			break;
+		}
+#if CONFIG_COROUTINE_VALGRIND
+		VALGRIND_ENABLE_ERROR_REPORTING;
+#endif
 		ret->stack_max--;
 	}