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WMDE: improves performance

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This commit is contained in:
Carter Li
2026-08-26 14:14:24 +08:00
parent 9670b585fb
commit 8b162e89de
1 changed files with 34 additions and 21 deletions
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src/detection/displayserver/linux/wmde.c
+34 -21
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@@ -7,6 +7,7 @@
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <libgen.h>
#if __FreeBSD__
#include <sys/sysctl.h>
@@ -376,48 +377,60 @@ static const char* getFromProcesses(FFDisplayServerResult* result) {
}
FF_STRBUF_AUTO_DESTROY procPath = ffStrbufCreateA(64);
ffStrbufAppendS(&procPath, "/proc/");
uint32_t procPathLength = procPath.length;
FF_STRBUF_AUTO_DESTROY loginuid = ffStrbufCreate();
FF_STRBUF_AUTO_DESTROY processName = ffStrbufCreateA(256); // Some processes have large command lines (looking at you chrome)
int procfd = dirfd(procdir);
struct dirent* dirent;
while ((dirent = readdir(procdir)) != nullptr) {
// Match only folders starting with a number (the pid folders)
if (dirent->d_type != DT_DIR || !ffCharIsDigit(dirent->d_name[0])) {
if ((dirent->d_type != DT_DIR && dirent->d_type != DT_UNKNOWN) || !ffCharIsDigit(dirent->d_name[0])) {
continue;
}
ffStrbufAppendS(&procPath, dirent->d_name);
ffStrbufSetS(&procPath, dirent->d_name);
uint32_t procFolderPathLength = procPath.length;
// Don't check for processes not owned by the current user.
char loginuid[32];
ffStrbufAppendS(&procPath, "/loginuid");
ffReadFileBuffer(procPath.chars, &loginuid);
if (ffStrbufToUInt(&loginuid, (uint64_t) -1) != userId) {
ffStrbufSubstrBefore(&procPath, procPathLength);
ssize_t bytesRead = ffReadFileDataRelative(procfd, procPath.chars, sizeof(loginuid) - 1, loginuid);
if (bytesRead <= 0) {
continue;
}
loginuid[bytesRead] = '\0';
if (strtol(loginuid, nullptr, 10) != (long) userId) {
continue;
}
ffStrbufSubstrBefore(&procPath, procFolderPathLength);
// We check the cmdline for the process name, because it is not trimmed.
ffStrbufAppendS(&procPath, "/cmdline");
ffReadFileBuffer(procPath.chars, &processName);
ffStrbufTrimRightSpace(&processName);
ffStrbufSubstrBeforeFirstC(&processName, '\0'); // Trim the arguments
ffStrbufSubstrAfterLastC(&processName, '/');
ffStrbufSubstrBefore(&procPath, procPathLength);
// We check the realpath for the process name
ffStrbufAppendS(&procPath, "/exe");
char exePath[PATH_MAX];
ssize_t exePathLength = readlinkat(procfd, procPath.chars, exePath, sizeof(exePath) - 1);
const char* processName;
if (exePathLength >= 0) {
exePath[exePathLength] = '\0';
processName = basename(exePath);
} else {
ffStrbufSubstrBefore(&procPath, procFolderPathLength);
ffStrbufAppendS(&procPath, "/comm");
exePathLength = ffReadFileDataRelative(procfd, procPath.chars, sizeof(exePath) - 1, exePath);
if (exePathLength <= 0) {
continue;
}
if (exePath[exePathLength - 1] == '\n') {
--exePathLength;
}
exePath[exePathLength] = '\0';
processName = exePath;
}
if (result->dePrettyName.length == 0) {
applyPrettyNameIfDE(result, processName.chars);
applyPrettyNameIfDE(result, processName);
}
if (result->wmPrettyName.length == 0) {
applyNameIfWM(result, processName.chars);
applyNameIfWM(result, processName);
}
if (result->dePrettyName.length > 0 && result->wmPrettyName.length > 0) {