From 0f0f96394a1b59cc1226be8d699b5316f7ea7b82 Mon Sep 17 00:00:00 2001 From: Quantum Date: Wed, 29 Jul 2026 00:27:08 -0400 Subject: [PATCH] [common] proctitle: add new module to set process title This module requires lgInitProcessTitle to be called on startup, which will preserve argv and environ by duplicating them onto the heap, and allow the the original memory of argv[...] and envp[...] to be reused for the new process title. --- common/include/common/proctitle.h | 26 ++++ common/src/platform/linux/CMakeLists.txt | 1 + common/src/platform/linux/proctitle.c | 132 +++++++++++++++++++++ common/src/platform/windows/CMakeLists.txt | 1 + common/src/platform/windows/proctitle.c | 36 ++++++ 5 files changed, 196 insertions(+) create mode 100644 common/include/common/proctitle.h create mode 100644 common/src/platform/linux/proctitle.c create mode 100644 common/src/platform/windows/proctitle.c diff --git a/common/include/common/proctitle.h b/common/include/common/proctitle.h new file mode 100644 index 00000000..8fe0b9d0 --- /dev/null +++ b/common/include/common/proctitle.h @@ -0,0 +1,26 @@ +/** + * Looking Glass + * Copyright © 2017-2026 The Looking Glass Authors + * https://looking-glass.io + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License as published by the Free + * Software Foundation; either version 2 of the License, or (at your option) + * any later version. + * + * This program is distributed in the hope that it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for + * more details. + * + * You should have received a copy of the GNU General Public License along + * with this program; if not, write to the Free Software Foundation, Inc., 59 + * Temple Place, Suite 330, Boston, MA 02111-1307 USA + */ + +#pragma once +#include + +void lgInitProcessTitle(int argc, char **pargv[]); +bool lgCanSetProcessTitle(void); +void lgSetProcessTitle(const char * title); diff --git a/common/src/platform/linux/CMakeLists.txt b/common/src/platform/linux/CMakeLists.txt index e723ea58..82b91adf 100644 --- a/common/src/platform/linux/CMakeLists.txt +++ b/common/src/platform/linux/CMakeLists.txt @@ -17,6 +17,7 @@ add_library(lg_common_platform_code STATIC paths.c open.c cpuinfo.c + proctitle.c ) if(ENABLE_BACKTRACE) diff --git a/common/src/platform/linux/proctitle.c b/common/src/platform/linux/proctitle.c new file mode 100644 index 00000000..73773f86 --- /dev/null +++ b/common/src/platform/linux/proctitle.c @@ -0,0 +1,132 @@ +/** + * Looking Glass + * Copyright © 2017-2026 The Looking Glass Authors + * https://looking-glass.io + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License as published by the Free + * Software Foundation; either version 2 of the License, or (at your option) + * any later version. + * + * This program is distributed in the hope that it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for + * more details. + * + * You should have received a copy of the GNU General Public License along + * with this program; if not, write to the Free Software Foundation, Inc., 59 + * Temple Place, Suite 330, Boston, MA 02111-1307 USA + */ + +#include "common/debug.h" +#include "common/proctitle.h" + +#include +#include + +static bool initialized; +static char * buffer; +static size_t totalSize = 0; + +static char ** duplicateArray(char ** array, int count) +{ + size_t size = (count + 1) * sizeof(char *); + char ** new = malloc(size); + if (!new) + return false; + + memset(new, 0, size); + for (int i = 0; i < count; ++i) + { + new[i] = strdup(array[i]); + if (!new[i]) + goto fail; + } + + new[count] = NULL; + return new; + +fail: + for (int i = 0; i < count; ++i) + if (new[i]) + free(new[i]); + + return NULL; +} + +static int extendContiguous(char ** end, char ** array) +{ + int i; + for (i = 0; array[i]; ++i) + if (array[i] == *end) + *end += strlen(array[i]) + 1; + + return i; +} + +void lgInitProcessTitle(int argc, char ***pargv) +{ + if (initialized) + return; + + char **argv = *pargv; + // it is technically possible to have no arguments, but then no titles for you + if (!argv[0]) + { + initialized = true; + return; + } + + char * start = argv[0]; + char * end = start; + extendContiguous(&end, argv); + + char ** newArgv = duplicateArray(argv, argc); + if (!newArgv) + { + initialized = true; + return; + } + *pargv = argv; + + char * envEnd = end; + int vars = extendContiguous(&envEnd, environ); + + if (envEnd != end) + { + char ** newEnv = duplicateArray(environ, vars); + if (newEnv) + { + environ = newEnv; + end = envEnd; + } + } + + initialized = true; + buffer = start; + totalSize = end - start; +} + +bool lgCanSetProcessTitle(void) +{ + return initialized && totalSize > 0; +} + +void lgSetProcessTitle(const char * title) +{ + if (!initialized) + { + DEBUG_ERROR("Attempt to use lgSetProcessTitle without lgInitProcessTitle"); + return; + } + + if (!totalSize) + return; + + size_t effective = strlen(title) + 1; + if (effective > totalSize) + effective = totalSize; + + memcpy(buffer, title, effective - 1); + buffer[effective - 1] = '\0'; +} diff --git a/common/src/platform/windows/CMakeLists.txt b/common/src/platform/windows/CMakeLists.txt index 5602a072..0f25eb81 100644 --- a/common/src/platform/windows/CMakeLists.txt +++ b/common/src/platform/windows/CMakeLists.txt @@ -40,6 +40,7 @@ add_library(lg_common_platform_code STATIC time.c cpuinfo.c display.c + proctitle.c ) target_link_libraries(lg_common_platform_code diff --git a/common/src/platform/windows/proctitle.c b/common/src/platform/windows/proctitle.c new file mode 100644 index 00000000..b0e8e8e1 --- /dev/null +++ b/common/src/platform/windows/proctitle.c @@ -0,0 +1,36 @@ +/** + * Looking Glass + * Copyright © 2017-2026 The Looking Glass Authors + * https://looking-glass.io + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License as published by the Free + * Software Foundation; either version 2 of the License, or (at your option) + * any later version. + * + * This program is distributed in the hope that it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for + * more details. + * + * You should have received a copy of the GNU General Public License along + * with this program; if not, write to the Free Software Foundation, Inc., 59 + * Temple Place, Suite 330, Boston, MA 02111-1307 USA + */ + +#include "common/proctitle.h" + +void lgInitProcessTitle(int argc, char **pargv[]) +{ + // not implemented on Windows +} + +bool lgCanSetProcessTitle(void) +{ + return false; +} + +void lgSetProcessTitle(const char * title) +{ + // not implemented on Windows +}