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htop/pcp/PCPDynamicColumn.c

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/*
htop - PCPDynamicColumn.c
(C) 2021 Sohaib Mohammed
(C) 2021 htop dev team
(C) 2021 Red Hat, Inc.
Released under the GNU GPLv2, see the COPYING file
in the source distribution for its full text.
*/
#include "config.h" // IWYU pragma: keep
#include "pcp/PCPDynamicColumn.h"
#include <ctype.h>
#include <dirent.h>
#include <errno.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "CRT.h"
#include "Macros.h"
#include "Platform.h"
#include "Process.h"
#include "ProcessList.h"
#include "RichString.h"
#include "XUtils.h"
#include "pcp/PCPProcess.h"
#include "pcp/PCPMetric.h"
static bool PCPDynamicColumn_addMetric(PCPDynamicColumns* columns, PCPDynamicColumn* column) {
if (!column->super.name[0])
return false;
size_t bytes = 16 + strlen(column->super.name);
char* metricName = xMalloc(bytes);
xSnprintf(metricName, bytes, "htop.column.%s", column->super.name);
column->metricName = metricName;
column->id = columns->offset + columns->cursor;
columns->cursor++;
Platform_addMetric(column->id, metricName);
return true;
}
static void PCPDynamicColumn_parseMetric(PCPDynamicColumns* columns, PCPDynamicColumn* column, const char* path, unsigned int line, char* value) {
/* lookup a dynamic metric with this name, else create */
if (PCPDynamicColumn_addMetric(columns, column) == false)
return;
/* derived metrics in all dynamic columns for simplicity */
char* error;
if (pmRegisterDerivedMetric(column->metricName, value, &error) < 0) {
char* note;
xAsprintf(&note,
"%s: failed to parse expression in %s at line %u\n%s\n",
pmGetProgname(), path, line, error);
free(error);
errno = EINVAL;
CRT_fatalError(note);
free(note);
}
}
// Ensure a valid name for use in a PCP metric name and in htoprc
static bool PCPDynamicColumn_validateColumnName(char* key, const char* path, unsigned int line) {
char* p = key;
char* end = strrchr(key, ']');
if (end) {
*end = '\0';
} else {
fprintf(stderr,
"%s: no closing brace on column name at %s line %u\n\"%s\"",
pmGetProgname(), path, line, key);
return false;
}
while (*p) {
if (p == key) {
if (!isalpha(*p) && *p != '_')
break;
} else {
if (!isalnum(*p) && *p != '_')
break;
}
p++;
}
if (*p != '\0') { /* badness */
fprintf(stderr,
"%s: invalid column name at %s line %u\n\"%s\"",
pmGetProgname(), path, line, key);
return false;
}
return true;
}
// Ensure a column name has not been defined previously
static bool PCPDynamicColumn_uniqueName(char* key, PCPDynamicColumns* columns) {
return DynamicColumn_search(columns->table, key, NULL) == NULL;
}
static PCPDynamicColumn* PCPDynamicColumn_new(PCPDynamicColumns* columns, const char* name) {
PCPDynamicColumn* column = xCalloc(1, sizeof(*column));
String_safeStrncpy(column->super.name, name, sizeof(column->super.name));
size_t id = columns->count + LAST_PROCESSFIELD;
Hashtable_put(columns->table, id, column);
columns->count++;
return column;
}
static void PCPDynamicColumn_parseFile(PCPDynamicColumns* columns, const char* path) {
FILE* file = fopen(path, "r");
if (!file)
return;
PCPDynamicColumn* column = NULL;
unsigned int lineno = 0;
bool ok = true;
for (;;) {
char* line = String_readLine(file);
if (!line)
break;
lineno++;
/* cleanup whitespace, skip comment lines */
char* trimmed = String_trim(line);
free(line);
if (!trimmed || !trimmed[0] || trimmed[0] == '#') {
free(trimmed);
continue;
}
size_t n;
char** config = String_split(trimmed, '=', &n);
free(trimmed);
if (config == NULL)
continue;
char* key = String_trim(config[0]);
char* value = n > 1 ? String_trim(config[1]) : NULL;
if (key[0] == '[') { /* new section heading - i.e. new column */
ok = PCPDynamicColumn_validateColumnName(key + 1, path, lineno);
if (ok)
ok = PCPDynamicColumn_uniqueName(key + 1, columns);
if (ok)
column = PCPDynamicColumn_new(columns, key + 1);
} else if (value && column && String_eq(key, "caption")) {
free_and_xStrdup(&column->super.caption, value);
} else if (value && column && String_eq(key, "heading")) {
free_and_xStrdup(&column->super.heading, value);
} else if (value && column && String_eq(key, "description")) {
free_and_xStrdup(&column->super.description, value);
} else if (value && column && String_eq(key, "width")) {
column->super.width = strtoul(value, NULL, 10);
} else if (value && column && String_eq(key, "metric")) {
PCPDynamicColumn_parseMetric(columns, column, path, lineno, value);
}
String_freeArray(config);
free(value);
free(key);
}
fclose(file);
}
static void PCPDynamicColumn_scanDir(PCPDynamicColumns* columns, char* path) {
DIR* dir = opendir(path);
if (!dir)
return;
struct dirent* dirent;
while ((dirent = readdir(dir)) != NULL) {
if (dirent->d_name[0] == '.')
continue;
char* file = String_cat(path, dirent->d_name);
PCPDynamicColumn_parseFile(columns, file);
free(file);
}
closedir(dir);
}
void PCPDynamicColumns_init(PCPDynamicColumns* columns) {
const char* share = pmGetConfig("PCP_SHARE_DIR");
const char* sysconf = pmGetConfig("PCP_SYSCONF_DIR");
const char* xdgConfigHome = getenv("XDG_CONFIG_HOME");
const char* override = getenv("PCP_HTOP_DIR");
const char* home = getenv("HOME");
char* path;
columns->table = Hashtable_new(0, true);
/* developer paths - PCP_HTOP_DIR=./pcp ./pcp-htop */
if (override) {
path = String_cat(override, "/columns/");
PCPDynamicColumn_scanDir(columns, path);
free(path);
}
/* next, search in home directory alongside htoprc */
if (xdgConfigHome)
path = String_cat(xdgConfigHome, "/htop/columns/");
else if (home)
path = String_cat(home, "/.config/htop/columns/");
else
path = NULL;
if (path) {
PCPDynamicColumn_scanDir(columns, path);
free(path);
}
/* next, search in the system columns directory */
path = String_cat(sysconf, "/htop/columns/");
PCPDynamicColumn_scanDir(columns, path);
free(path);
/* next, try the readonly system columns directory */
path = String_cat(share, "/htop/columns/");
PCPDynamicColumn_scanDir(columns, path);
free(path);
}
static void PCPDynamicColumns_free(ATTR_UNUSED ht_key_t key, void* value, ATTR_UNUSED void* data) {
PCPDynamicColumn* column = (PCPDynamicColumn*) value;
free(column->metricName);
free(column->super.heading);
free(column->super.caption);
free(column->super.description);
}
void PCPDynamicColumns_done(Hashtable* table) {
Hashtable_foreach(table, PCPDynamicColumns_free, NULL);
}
void PCPDynamicColumn_writeField(PCPDynamicColumn* this, const Process* proc, RichString* str) {
const PCPProcess* pp = (const PCPProcess*) proc;
unsigned int type = PCPMetric_type(this->id);
pmAtomValue atom;
if (!PCPMetric_instance(this->id, proc->pid, pp->offset, &atom, type)) {
RichString_appendAscii(str, CRT_colors[METER_VALUE_ERROR], "no data");
return;
}
int width = this->super.width;
if (!width || abs(width) > DYNAMIC_MAX_COLUMN_WIDTH)
width = DYNAMIC_DEFAULT_COLUMN_WIDTH;
int abswidth = abs(width);
if (abswidth > DYNAMIC_MAX_COLUMN_WIDTH) {
abswidth = DYNAMIC_MAX_COLUMN_WIDTH;
width = -abswidth;
}
char buffer[DYNAMIC_MAX_COLUMN_WIDTH + /* space */ 1 + /* null terminator */ + 1];
int attr = CRT_colors[DEFAULT_COLOR];
switch (type) {
case PM_TYPE_STRING:
attr = CRT_colors[PROCESS_SHADOW];
Process_printLeftAlignedField(str, attr, atom.cp, abswidth);
free(atom.cp);
break;
case PM_TYPE_32:
xSnprintf(buffer, sizeof(buffer), "%*d ", width, atom.l);
RichString_appendAscii(str, attr, buffer);
break;
case PM_TYPE_U32:
xSnprintf(buffer, sizeof(buffer), "%*u ", width, atom.ul);
RichString_appendAscii(str, attr, buffer);
break;
case PM_TYPE_64:
xSnprintf(buffer, sizeof(buffer), "%*lld ", width, (long long) atom.ll);
RichString_appendAscii(str, attr, buffer);
break;
case PM_TYPE_U64:
xSnprintf(buffer, sizeof(buffer), "%*llu ", width, (unsigned long long) atom.ull);
RichString_appendAscii(str, attr, buffer);
break;
case PM_TYPE_FLOAT:
xSnprintf(buffer, sizeof(buffer), "%*.2f ", width, (double) atom.f);
RichString_appendAscii(str, attr, buffer);
break;
case PM_TYPE_DOUBLE:
xSnprintf(buffer, sizeof(buffer), "%*.2f ", width, atom.d);
RichString_appendAscii(str, attr, buffer);
break;
default:
attr = CRT_colors[METER_VALUE_ERROR];
RichString_appendAscii(str, attr, "no type");
break;
}
}
int PCPDynamicColumn_compareByKey(const PCPProcess* p1, const PCPProcess* p2, ProcessField key) {
const PCPDynamicColumn* column = Hashtable_get(p1->super.processList->dynamicColumns, key);
if (!column)
return -1;
size_t metric = column->id;
unsigned int type = PCPMetric_type(metric);
pmAtomValue atom1 = {0}, atom2 = {0};
if (!PCPMetric_instance(metric, p1->super.pid, p1->offset, &atom1, type) ||
!PCPMetric_instance(metric, p2->super.pid, p2->offset, &atom2, type)) {
if (type == PM_TYPE_STRING) {
free(atom1.cp);
free(atom2.cp);
}
return -1;
}
switch (type) {
case PM_TYPE_STRING: {
int cmp = SPACESHIP_NULLSTR(atom2.cp, atom1.cp);
free(atom2.cp);
free(atom1.cp);
return cmp;
}
case PM_TYPE_32:
return SPACESHIP_NUMBER(atom2.l, atom1.l);
case PM_TYPE_U32:
return SPACESHIP_NUMBER(atom2.ul, atom1.ul);
case PM_TYPE_64:
return SPACESHIP_NUMBER(atom2.ll, atom1.ll);
case PM_TYPE_U64:
return SPACESHIP_NUMBER(atom2.ull, atom1.ull);
case PM_TYPE_FLOAT:
return SPACESHIP_NUMBER(atom2.f, atom1.f);
case PM_TYPE_DOUBLE:
return SPACESHIP_NUMBER(atom2.d, atom1.d);
default:
break;
}
return -1;
}
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