| /* Locating a program in PATH. | |
| Copyright (C) 2001-2003, 2009-2023 Free Software Foundation, Inc. | |
| Written by Bruno Haible <[email protected]>, 2001. | |
| This file is free software: you can redistribute it and/or modify | |
| it under the terms of the GNU Lesser General Public License as | |
| published by the Free Software Foundation; either version 2.1 of the | |
| License, or (at your option) any later version. | |
| This file 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 Lesser General Public License for more details. | |
| You should have received a copy of the GNU Lesser General Public License | |
| along with this program. If not, see <https://www.gnu.org/licenses/>. */ | |
| extern "C" { | |
| /* Looks up a program in the PATH. | |
| Attempts to determine the pathname that would be called by execlp/execvp | |
| of PROGNAME. If successful, it returns a pathname containing a slash | |
| (either absolute or relative to the current directory). Otherwise, it | |
| returns PROGNAME unmodified. | |
| Because of the latter case, callers should use execlp/execvp, not | |
| execl/execv on the returned pathname. | |
| The returned string is freshly malloc()ed if it is != PROGNAME. */ | |
| extern const char *find_in_path (const char *progname); | |
| /* Looks up a program in the given PATH-like string. | |
| The PATH argument consists of a list of directories, separated by ':' or | |
| (on native Windows) by ';'. An empty PATH element designates the current | |
| directory. A null PATH is equivalent to an empty PATH, that is, to the | |
| singleton list that contains only the current directory. | |
| If DIRECTORY is not NULL, all relative filenames (i.e. PROGNAME when it | |
| contains a slash, and the PATH elements) are considered relative to | |
| DIRECTORY instead of relative to the current directory of this process. | |
| Determines the pathname that would be called by execlp/execvp of PROGNAME. | |
| - If successful, it returns a pathname containing a slash (either absolute | |
| or relative to the current directory). The returned string can be used | |
| with either execl/execv or execlp/execvp. It is freshly malloc()ed if it | |
| is != PROGNAME. | |
| - Otherwise, it sets errno and returns NULL. | |
| Specific errno values include: | |
| - ENOENT: means that the program's file was not found. | |
| - EACCES: means that the program's file cannot be accessed (due to some | |
| issue with one of the ancestor directories) or lacks the execute | |
| permissions. | |
| - ENOMEM: means out of memory. | |
| If OPTIMIZE_FOR_EXEC is true, the function saves some work, under the | |
| assumption that the resulting pathname will not be accessed directly, | |
| only through execl/execv or execlp/execvp. | |
| Here, a "slash" means: | |
| - On POSIX systems excluding Cygwin: a '/', | |
| - On Windows, OS/2, DOS platforms: a '/' or '\'. */ | |
| extern const char *find_in_given_path (const char *progname, const char *path, | |
| const char *directory, | |
| bool optimize_for_exec); | |
| } | |