1/* 2 * Copyright © 2019 Red Hat, Inc. 3 * 4 * Permission is hereby granted, free of charge, to any person obtaining a 5 * copy of this software and associated documentation files (the "Software"), 6 * to deal in the Software without restriction, including without limitation 7 * the rights to use, copy, modify, merge, publish, distribute, sublicense, 8 * and/or sell copies of the Software, and to permit persons to whom the 9 * Software is furnished to do so, subject to the following conditions: 10 * 11 * The above copyright notice and this permission notice (including the next 12 * paragraph) shall be included in all copies or substantial portions of the 13 * Software. 14 * 15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 17 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 18 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 19 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING 20 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER 21 * DEALINGS IN THE SOFTWARE. 22 */ 23 24#include <config.h> 25 26#pragma once 27 28#include <unistd.h> 29#include "util-strings.h" 30 31/** 32 * Try to figure out the directory we're executing from and if it matches 33 * the builddir, return that directory. Otherwise, return NULL. 34 */ 35static inline char * 36builddir_lookup(void) 37{ 38 char execdir[PATH_MAX]; 39 char *pathsep; 40 ssize_t nread; 41 42 /* In the case of release builds, the builddir is 43 the empty string */ 44 if (streq(MESON_BUILD_ROOT, "")) 45 return NULL; 46 47 nread = readlink("/proc/self/exe", execdir, sizeof(execdir) - 1); 48 if (nread <= 0 || nread == sizeof(execdir) - 1) 49 return NULL; 50 51 /* readlink doesn't terminate the string and readlink says 52 anything past sz is undefined */ 53 execdir[nread] = '\0'; 54 55 pathsep = strrchr(execdir, '/'); 56 if (!pathsep) 57 return NULL; 58 59 *pathsep = '\0'; 60 if (!streq(execdir, MESON_BUILD_ROOT)) 61 return NULL; 62 63 return safe_strdup(execdir); 64} 65