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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 <libhw/generic/alarmclock.h>
#include <libmisc/alloc.h> /* for heap_alloc(), free() */
#include <libmisc/fmt.h> /* for fmt_snprint() */
#include <util9p/static.h>
#include "fs_harness_uptime_txt.h"
LO_IMPLEMENTATION_C(lib9p_srv_file, struct uptime_file, uptime_file);
struct uptime_fio {
struct uptime_file *parent;
size_t buf_len;
/* The maximum length (UINT64_MAX) string is 52 bytes, not
* including a nul-terminator:
*
* "18446744073709551615ns\n" # 22+1
* "584y343d 23h34m33.709551615s\n" # 28+1
*/
char buf[52];
};
LO_IMPLEMENTATION_STATIC(lib9p_srv_fio, struct uptime_fio, uptime_fio);
/* srv_file *******************************************************************/
void uptime_file_free(struct uptime_file *self) {
assert(self);
}
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,
};
}
lib9p_srv_stat_or_error 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 ERROR_NEW_VAL(lib9p_srv_stat, ((struct lib9p_srv_stat){
.qid = uptime_file_qid(self),
.mode = 0444,
.atime_sec = UTIL9P_ATIME,
.mtime_sec = UTIL9P_MTIME,
.size = size,
.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),
}));
}
error uptime_file_wstat(struct uptime_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 uptime_file_remove(struct uptime_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 uptime_file, uptime_file);
lib9p_srv_fio_or_error 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 = heap_alloc(1, struct uptime_fio);
ret->parent = self;
ret->buf_len = 0;
return ERROR_NEW_VAL(lib9p_srv_fio, LO_BOX(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_ioqid(struct uptime_fio *self) {
assert(self);
assert(self->parent);
return uptime_file_qid(self->parent);
}
#define NS_PER_M (NS_PER_S*60)
#define NS_PER_H (NS_PER_S*60*60)
#define NS_PER_D (NS_PER_S*60*60*24)
#define NS_PER_Y (NS_PER_S*60*60*24*365)
static error uptime_fio_pread(struct uptime_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) {
uint64_t now = LO_CALL(bootclock, get_time_ns);
self->buf_len = fmt_snprint(self->buf, sizeof(self->buf), now, "ns\n");
uint64_t ns = now;
uint64_t y = ns/NS_PER_Y; ns -= y*NS_PER_Y;
uint64_t d = ns/NS_PER_D; ns -= d*NS_PER_D;
uint64_t h = ns/NS_PER_H; ns -= h*NS_PER_H;
uint64_t m = ns/NS_PER_M; ns -= m*NS_PER_M;
uint64_t s = ns/NS_PER_S; ns -= s*NS_PER_S;
if (y)
self->buf_len += fmt_snprint(&self->buf[self->buf_len], sizeof(self->buf)-self->buf_len, y, "y");
if (y || d)
self->buf_len += fmt_snprint(&self->buf[self->buf_len], sizeof(self->buf)-self->buf_len, d, "d ");
if (y || d || h)
self->buf_len += fmt_snprint(&self->buf[self->buf_len], sizeof(self->buf)-self->buf_len, h, "h");
if (y || d || h || m)
self->buf_len += fmt_snprint(&self->buf[self->buf_len], sizeof(self->buf)-self->buf_len, m, "m");
self->buf_len += fmt_snprint(&self->buf[self->buf_len], sizeof(self->buf)-self->buf_len, s, ".", (rjust, 9, '0', ns), "s\n");
}
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, &self->buf[beg_off], end_off-beg_off).err;
}
static uint32_t_or_error 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);
return ERROR_NEW_ERR(uint32_t, error_new(E_POSIX_EROFS, "read-only part of filesystem"));
}
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