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/* sbc_harness/fs_harness_uptime_txt.c - 9P access to harness uptime
*
* Copyright (C) 2025 Luke T. Shumaker <lukeshu@lukeshu.com>
* SPDX-License-Identifier: AGPL-3.0-or-later
*/
#include <stdio.h> /* for snprintf() */
#include <stdlib.h> /* for malloc(), free() */
#include <libhw/generic/alarmclock.h>
#include <util9p/static.h>
#include "fs_harness_uptime_txt.h"
LO_IMPLEMENTATION_C(lib9p_srv_file, struct uptime_file, uptime_file, static);
struct uptime_fio {
struct uptime_file *parent;
size_t buf_len;
char buf[24]; /* len(str(UINT64_MAX)+"ns\n\0") */
};
LO_IMPLEMENTATION_H(lib9p_srv_fio, struct uptime_fio, uptime_fio);
LO_IMPLEMENTATION_C(lib9p_srv_fio, struct uptime_fio, uptime_fio, static);
/* srv_file *******************************************************************/
static void uptime_file_free(struct uptime_file *self) {
assert(self);
}
static struct lib9p_qid uptime_file_qid(struct uptime_file *self) {
assert(self);
return (struct lib9p_qid){
.type = LIB9P_QT_FILE,
.vers = 1,
.path = self->pathnum,
};
}
static struct lib9p_stat uptime_file_stat(struct uptime_file *self, struct lib9p_srv_ctx *ctx) {
assert(self);
assert(ctx);
uint64_t now = LO_CALL(bootclock, get_time_ns);
uint64_t size = 0;
while (now) {
size++;
now /= 10;
}
if (!size)
size++;
size += 3;
return (struct lib9p_stat){
.kern_type = 0,
.kern_dev = 0,
.file_qid = uptime_file_qid(self),
.file_mode = 0444,
.file_atime = UTIL9P_ATIME,
.file_mtime = UTIL9P_MTIME,
.file_size = size,
.file_name = lib9p_str(self->name),
.file_owner_uid = lib9p_str("root"),
.file_owner_gid = lib9p_str("root"),
.file_last_modified_uid = lib9p_str("root"),
.file_extension = lib9p_str(NULL),
.file_owner_n_uid = 0,
.file_owner_n_gid = 0,
.file_last_modified_n_uid = 0,
};
}
static void uptime_file_wstat(struct uptime_file *self, struct lib9p_srv_ctx *ctx,
struct lib9p_stat) {
assert(self);
assert(ctx);
lib9p_error(&ctx->basectx, LIB9P_ERRNO_L_EROFS, "read-only part of filesystem");
}
static void uptime_file_remove(struct uptime_file *self, struct lib9p_srv_ctx *ctx) {
assert(self);
assert(ctx);
lib9p_error(&ctx->basectx, LIB9P_ERRNO_L_EROFS, "read-only part of filesystem");
}
LIB9P_SRV_NOTDIR(struct uptime_file, uptime_file);
static lo_interface lib9p_srv_fio uptime_file_fopen(struct uptime_file *self, struct lib9p_srv_ctx *ctx,
bool LM_UNUSED(rd), bool LM_UNUSED(wr), bool LM_UNUSED(trunc)) {
assert(self);
assert(ctx);
struct uptime_fio *ret = malloc(sizeof(struct uptime_fio));
ret->parent = self;
ret->buf_len = 0;
return lo_box_uptime_fio_as_lib9p_srv_fio(ret);
}
/* srv_fio ********************************************************************/
static uint32_t uptime_fio_iounit(struct uptime_fio *self) {
assert(self);
return sizeof(self->buf)-1;
}
static void uptime_fio_iofree(struct uptime_fio *self) {
assert(self);
free(self);
}
static struct lib9p_qid uptime_fio_qid(struct uptime_fio *self) {
assert(self);
assert(self->parent);
return uptime_file_qid(self->parent);
}
static void uptime_fio_pread(struct uptime_fio *self, struct lib9p_srv_ctx *ctx,
uint32_t byte_count, uint64_t byte_offset,
struct iovec *ret) {
assert(self);
assert(ctx);
assert(ret);
if (byte_offset == 0 || self->buf_len == 0) {
uint64_t now = LO_CALL(bootclock, get_time_ns);
self->buf_len = snprintf(self->buf, sizeof(self->buf), "%"PRIu64"ns\n", now);
}
if (byte_offset > (uint64_t)self->buf_len) {
lib9p_error(&ctx->basectx,
LIB9P_ERRNO_L_EINVAL, "offset is past end-of-file length");
return;
}
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;
*ret = (struct iovec){
.iov_base = &self->buf[beg_off],
.iov_len = end_off-beg_off,
};
}
static uint32_t uptime_fio_pwrite(struct uptime_fio *self, struct lib9p_srv_ctx *ctx,
void *LM_UNUSED(buf),
uint32_t LM_UNUSED(byte_count),
uint64_t LM_UNUSED(byte_offset)) {
assert(self);
assert(ctx);
lib9p_error(&ctx->basectx, LIB9P_ERRNO_L_EROFS, "read-only part of filesystem");
return 0;
}
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