mirror of https://github.com/htop-dev/htop.git
119 lines
3.6 KiB
C
119 lines
3.6 KiB
C
/*
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htop - FileDescriptorMeter.c
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(C) 2022 htop dev team
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Released under the GNU GPLv2+, see the COPYING file
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in the source distribution for its full text.
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*/
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#include "config.h" // IWYU pragma: keep
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#include "FileDescriptorMeter.h"
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#include <math.h>
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#include "CRT.h"
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#include "Macros.h"
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#include "Meter.h"
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#include "Object.h"
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#include "Platform.h"
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#include "RichString.h"
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#include "XUtils.h"
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#define FD_EFFECTIVE_UNLIMITED(x) (!isgreaterequal((double)(1<<30), (x)))
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static const int FileDescriptorMeter_attributes[] = {
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FILE_DESCRIPTOR_USED,
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FILE_DESCRIPTOR_MAX
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};
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static void FileDescriptorMeter_updateValues(Meter* this) {
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this->values[0] = 0;
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this->values[1] = 1;
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Platform_getFileDescriptors(&this->values[0], &this->values[1]);
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/* only print bar for first value */
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this->curItems = 1;
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/* Use maximum value for scaling of bar mode
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*
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* As the plain total value can be very large compared to
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* the actually used value, this is capped in the following way:
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*
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* 1. If the maximum value is below (or equal to) 1<<16, use it directly
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* 2. If the maximum value is above, use powers of 2 starting at 1<<16 and
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* double it until it's larger than 16 times the used file handles
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* (capped at the maximum number of files)
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* 3. If the maximum is effectively unlimited (AKA > 1<<30),
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* Do the same as for 2, but cap at 1<<30.
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*/
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if (this->values[1] <= 1 << 16) {
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this->total = this->values[1];
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} else {
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if (this->total < 16 * this->values[0]) {
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for (this->total = 1 << 16; this->total < 16 * this->values[0]; this->total *= 2) {
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if (this->total >= 1 << 30) {
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break;
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}
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}
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}
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if (this->total > this->values[1]) {
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this->total = this->values[1];
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}
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if (this->total > 1 << 30) {
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this->total = 1 << 30;
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}
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}
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if (!isNonnegative(this->values[0])) {
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xSnprintf(this->txtBuffer, sizeof(this->txtBuffer), "unknown/unknown");
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} else if (FD_EFFECTIVE_UNLIMITED(this->values[1])) {
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xSnprintf(this->txtBuffer, sizeof(this->txtBuffer), "%.0lf/unlimited", this->values[0]);
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} else {
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xSnprintf(this->txtBuffer, sizeof(this->txtBuffer), "%.0lf/%.0lf", this->values[0], this->values[1]);
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}
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}
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static void FileDescriptorMeter_display(const Object* cast, RichString* out) {
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const Meter* this = (const Meter*)cast;
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char buffer[50];
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int len;
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if (!isNonnegative(this->values[0])) {
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RichString_appendAscii(out, CRT_colors[METER_TEXT], "unknown");
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return;
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}
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RichString_appendAscii(out, CRT_colors[METER_TEXT], "used: ");
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len = xSnprintf(buffer, sizeof(buffer), "%.0lf", this->values[0]);
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RichString_appendnAscii(out, CRT_colors[FILE_DESCRIPTOR_USED], buffer, len);
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RichString_appendAscii(out, CRT_colors[METER_TEXT], " max: ");
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if (FD_EFFECTIVE_UNLIMITED(this->values[1])) {
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RichString_appendAscii(out, CRT_colors[FILE_DESCRIPTOR_MAX], "unlimited");
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} else {
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len = xSnprintf(buffer, sizeof(buffer), "%.0lf", this->values[1]);
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RichString_appendnAscii(out, CRT_colors[FILE_DESCRIPTOR_MAX], buffer, len);
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}
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}
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const MeterClass FileDescriptorMeter_class = {
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.super = {
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.extends = Class(Meter),
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.delete = Meter_delete,
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.display = FileDescriptorMeter_display,
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},
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.updateValues = FileDescriptorMeter_updateValues,
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.defaultMode = TEXT_METERMODE,
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.maxItems = 2,
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.total = 65536.0,
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.attributes = FileDescriptorMeter_attributes,
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.name = "FileDescriptors",
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.uiName = "File Descriptors",
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.caption = "FDs: ",
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.description = "Number of allocated/available file descriptors"
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};
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