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#include <errno.h>
#include <fs/procfs.h>
#include <lib/sb.h>
#include <lib/sv.h>
#include <stdio.h>
#define ARRAY_LENGTH(a) (sizeof(a) / sizeof((a)[0]))
vfs_inode_t *procfs_open(const char *p);
void procfs_close(vfs_fd_t *fd) {
return;
}
void process_close(vfs_fd_t *fd) {
process_t *p = fd->inode->internal_object;
if (!p) {
return;
}
process_remove_reference(p);
}
int procfs_read(u8 *buffer, u64 offset, u64 len, vfs_fd_t *fd) {
struct sb builder;
sb_init_buffer(&builder, buffer, len);
size_t read_amount = 0;
process_t *p = ready_queue;
for (; p; p = p->next) {
struct dirent entry;
entry.d_ino = p->pid;
ksnprintf(entry.d_name, sizeof(entry.d_name), "%u", p->pid);
if (read_amount >= offset) {
if (0 == sb_append_buffer(&builder, (u8 *)&entry, sizeof(entry))) {
break;
}
}
read_amount += sizeof(struct dirent);
}
return sv_length(SB_TO_SV(builder));
}
#define PROCESS_ROOT 0
#define PROCESS_SIGNAL 1
#define PROCESS_NAME 2
struct dirent process_entries[] = {
{
.d_ino = PROCESS_ROOT,
.d_name = "",
},
{
.d_ino = PROCESS_ROOT,
.d_name = ".",
},
{
.d_ino = PROCESS_SIGNAL,
.d_name = "signal",
},
{
.d_ino = PROCESS_NAME,
.d_name = "name",
},
};
int process_read(u8 *buffer, u64 offset, u64 len, vfs_fd_t *fd) {
process_t *p = fd->inode->internal_object;
struct sb builder;
sb_init_buffer(&builder, buffer, len);
int id = fd->inode->inode_num;
if (PROCESS_ROOT == id) {
size_t read_amount = 0;
for (size_t i = 0; i < ARRAY_LENGTH(process_entries); i++) {
if (0 == strlen(process_entries[i].d_name)) {
continue;
}
if (read_amount >= offset) {
if (0 == sb_append_buffer(&builder, (u8 *)&process_entries[i],
sizeof(struct dirent))) {
break;
}
}
read_amount += sizeof(struct dirent);
}
return sv_length(SB_TO_SV(builder));
}
if (PROCESS_NAME == id) {
struct sv program_name = C_TO_SV(p->program_name);
sv_take(program_name, &program_name, offset);
sb_append_sv(&builder, program_name);
return sv_length(SB_TO_SV(builder));
}
return -EBADF;
}
int process_write(u8 *buffer, u64 offset, u64 len, vfs_fd_t *fd) {
(void)offset;
process_t *p = fd->inode->internal_object;
int id = fd->inode->inode_num;
if (PROCESS_SIGNAL == id) {
struct sv t = sv_init(buffer, len);
int got_num;
u64 signal = sv_parse_unsigned_number(t, NULL, &got_num);
if (got_num) {
signal_process(p, signal);
}
// TODO: Add the ability to write "SIGTERM", "SIGKILL" etc without
// writing the number.
return 0;
}
return -EBADF;
}
vfs_inode_t *open_process(u64 pid, int id) {
process_t *process = NULL;
process_t *t = ready_queue;
for (; t; t = t->next) {
if ((u64)t->pid == pid) {
process = t;
break;
}
}
if (!process) {
return NULL;
}
vfs_inode_t *inode = vfs_create_inode(
id /*inode_num*/, 0 /*type*/, 0 /*has_data*/, 0 /*can_write*/,
0 /*is_open*/, 0, process /*internal_object*/, 0 /*file_size*/,
procfs_open, NULL /*create_file*/, process_read, process_write,
process_close, NULL /*create_directory*/, NULL /*get_vm_object*/,
NULL /*truncate*/, NULL /*stat*/, NULL /*send_signal*/, NULL /*connect*/);
if (!inode) {
return NULL;
}
process->reference_count++;
return inode;
}
vfs_inode_t *procfs_open(const char *p) {
struct sv path = C_TO_SV(p);
if ((sv_try_eat(path, &path, C_TO_SV("/")) && 0 == sv_length(path)) ||
0 == sv_length(path)) {
return vfs_create_inode(
0 /*inode_num*/, 0 /*type*/, 0 /*has_data*/, 0 /*can_write*/,
0 /*is_open*/, 0, NULL /*internal_object*/, 0 /*file_size*/,
procfs_open, NULL /*create_file*/, procfs_read, NULL /* write */,
procfs_close, NULL /*create_directory*/, NULL /*get_vm_object*/,
NULL /*truncate*/, NULL /*stat*/, NULL /*send_signal*/,
NULL /*connect*/);
}
int got_num;
u64 pid = sv_parse_unsigned_number(path, &path, &got_num);
if (!got_num) {
return NULL;
}
// NOTE: There should only be one '/' since the previous vfs_open will
// call vfs_clean_path first. This is a bit hacky and that code might
// change later and as a result introduce bugs here.
sv_try_eat(path, &path, C_TO_SV("/"));
for (size_t i = 0; i < ARRAY_LENGTH(process_entries); i++) {
if (sv_eq(path, C_TO_SV(process_entries[i].d_name))) {
return open_process(pid, process_entries[i].d_ino);
}
}
return NULL;
}
vfs_inode_t *procfs_mount(void) {
vfs_inode_t *inode = vfs_create_inode(
0 /*inode_num*/, 0 /*type*/, 0 /*has_data*/, 0 /*can_write*/,
0 /*is_open*/, 0, NULL /*internal_object*/, 0 /*file_size*/, procfs_open,
NULL /*create_file*/, procfs_read, NULL /* write */, procfs_close,
NULL /*create_directory*/, NULL /*get_vm_object*/, NULL /*truncate*/,
NULL /*stat*/, NULL /*send_signal*/, NULL /*connect*/);
return inode;
}
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