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cosmopolitan/libc/dlopen/dlfcn.h

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Introduce dlopen() support Every program built using Cosmopolitan is statically-linked. However there are some cases, e.g. GUIs and video drivers, where linking the host platform libraries is desirable. So what we do in such cases is launch a stub executable using the host platform's libc, and longjmp back into this executable. The stub executable passes back to us the platform-specific dlopen() implementation, which we shall then wrap. Here's the list of platforms that are supported so far: - x86-64 Linux w/ Glibc - x86-64 Linux w/ Musl Libc - x86-64 FreeBSD - x86-64 Windows - aarch64 Linux w/ Glibc - aarch64 MacOS What this means is your Cosmo programs can call foreign functions on your host operating system. However, it's important to note that any foreign library you link won't have the ability to call functions in your Cosmopolitan program. For example it's now technically possible that Lua can load a module, however that almost certainly won't work since the Lua module won't have access to Cosmo's Lua API. Kudos to @jacereda for figuring out how to do this.
2023-11-03 06:04:13 -07:00
#ifndef COSMOPOLITAN_LIBC_DLFCN_H_
#define COSMOPOLITAN_LIBC_DLFCN_H_
Get Fabrice Bellard's JavaScript engine to build $ m=tiny $ make -j12 MODE=$m o/$m/third_party/quickjs/qjs.com $ o/$m/third_party/quickjs/qjs.com -e 'console.log(2 + 2)' 4 $ ls -hal o/$m/third_party/quickjs/qjs.com 631.5K See #97
2021-04-09 01:06:57 -07:00
#define RTLD_LOCAL 0
#define RTLD_LAZY 1
#define RTLD_NOW 2
#define RTLD_GLOBAL 256
COSMOPOLITAN_C_START_
#define RTLD_NEXT ((void *)-1)
#define RTLD_DEFAULT ((void *)0)
Add `dontthrow` attribute to most libc functions This will help C++ code that uses exceptions to be tinier. For example, this change shaves away 1000 lines of assembly code from LLVM's libcxx, which is 0.7% of all assembly instructions in the entire library.
2024-01-09 01:26:03 -08:00
char *dlerror(void) libcesque;
void *dlopen(const char *, int) libcesque;
void *dlsym(void *, const char *) libcesque;
int dlclose(void *) libcesque;
Get Fabrice Bellard's JavaScript engine to build $ m=tiny $ make -j12 MODE=$m o/$m/third_party/quickjs/qjs.com $ o/$m/third_party/quickjs/qjs.com -e 'console.log(2 + 2)' 4 $ ls -hal o/$m/third_party/quickjs/qjs.com 631.5K See #97
2021-04-09 01:06:57 -07:00
Add `dontthrow` attribute to most libc functions This will help C++ code that uses exceptions to be tinier. For example, this change shaves away 1000 lines of assembly code from LLVM's libcxx, which is 0.7% of all assembly instructions in the entire library.
2024-01-09 01:26:03 -08:00
char *cosmo_dlerror(void) libcesque;
void *cosmo_dlopen(const char *, int) libcesque;
void *cosmo_dlsym(void *, const char *) libcesque;
void *cosmo_dltramp(void *) libcesque;
int cosmo_dlclose(void *) libcesque;
Rename dlopen() to cosmo_dlopen()
2023-11-12 01:19:04 -08:00
Get Fabrice Bellard's JavaScript engine to build $ m=tiny $ make -j12 MODE=$m o/$m/third_party/quickjs/qjs.com $ o/$m/third_party/quickjs/qjs.com -e 'console.log(2 + 2)' 4 $ ls -hal o/$m/third_party/quickjs/qjs.com 631.5K See #97
2021-04-09 01:06:57 -07:00
COSMOPOLITAN_C_END_
Introduce dlopen() support Every program built using Cosmopolitan is statically-linked. However there are some cases, e.g. GUIs and video drivers, where linking the host platform libraries is desirable. So what we do in such cases is launch a stub executable using the host platform's libc, and longjmp back into this executable. The stub executable passes back to us the platform-specific dlopen() implementation, which we shall then wrap. Here's the list of platforms that are supported so far: - x86-64 Linux w/ Glibc - x86-64 Linux w/ Musl Libc - x86-64 FreeBSD - x86-64 Windows - aarch64 Linux w/ Glibc - aarch64 MacOS What this means is your Cosmo programs can call foreign functions on your host operating system. However, it's important to note that any foreign library you link won't have the ability to call functions in your Cosmopolitan program. For example it's now technically possible that Lua can load a module, however that almost certainly won't work since the Lua module won't have access to Cosmo's Lua API. Kudos to @jacereda for figuring out how to do this.
2023-11-03 06:04:13 -07:00
#endif /* COSMOPOLITAN_LIBC_DLFCN_H_ */
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