diff options
Diffstat (limited to 'src/libcamera/utils.cpp')
| -rw-r--r-- | src/libcamera/utils.cpp | 49 |
1 files changed, 49 insertions, 0 deletions
diff --git a/src/libcamera/utils.cpp b/src/libcamera/utils.cpp index f566e88c..7e118faf 100644 --- a/src/libcamera/utils.cpp +++ b/src/libcamera/utils.cpp @@ -7,7 +7,10 @@ #include "utils.h" +#include <dlfcn.h> +#include <elf.h> #include <iomanip> +#include <link.h> #include <sstream> #include <stdlib.h> #include <string.h> @@ -18,6 +21,9 @@ * \brief Miscellaneous utility functions */ +/* musl doesn't declare _DYNAMIC in link.h, declare it manually. */ +extern ElfW(Dyn) _DYNAMIC[]; + namespace libcamera { namespace utils { @@ -310,6 +316,49 @@ details::StringSplitter split(const std::string &str, const std::string &delim) return details::StringSplitter(str, delim); } +/** + * \brief Check if libcamera is installed or not + * + * Utilise the build_rpath dynamic tag which is stripped out by meson at + * install time to determine at runtime if the library currently executing + * has been installed or not. + * + * \return True if libcamera is installed, false otherwise + */ +bool isLibcameraInstalled() +{ + /* + * DT_RUNPATH (DT_RPATH when the linker uses old dtags) is removed on + * install. + */ + for (const ElfW(Dyn) *dyn = _DYNAMIC; dyn->d_tag != DT_NULL; ++dyn) { + if (dyn->d_tag == DT_RUNPATH || dyn->d_tag == DT_RPATH) + return false; + } + + return true; +} + +/** + * \brief Identify the libcamera.so path + * + * This function locates the running libcamera.so and returns its full path, + * including the file name. + * + * \return A string stating the path + */ +std::string libcameraPath() +{ + Dl_info info; + + /* Look up our own symbol. */ + int ret = dladdr(reinterpret_cast<void *>(libcameraPath), &info); + if (ret == 0) + return nullptr; + + return info.dli_fname; +} + } /* namespace utils */ } /* namespace libcamera */ |