Libc Functions

You can privately contact the project stewards by emailing [email protected] FILE *fopen(const char *filename, const char *mode) Parameters. 1, is no longer provided. Using AVR Libraries. 4, another uses gcc version 6. appear before any use of the variables in a function (arena. But you can use for example FOR loop instead of this function or look at the Mode Entry module. Description. Table of Contents. h instead of the libc string functions. Fast, light, robust. If that's still not enough to make gnulib happy, you may have to do additional preprocessor hacks so their "rpl_" functions get again mapped to the real libc thing. Each item in the array pointed to by buffer is of type void *, and is the return address from the corresponding stack frame. Why I'm donating $150/month (10% of my income) to the musl libc project. c uses one). Some are just dummy functions that do nothing. thank your answer! I also study some documention including the readme and know about the --specs. Show how to call a function in a shared library (without dynamically linking to it at compile-time). In the following example I will use the system() function, a generic return argument and a command argument, "/bin/sh", and as no shellcode is required to. Since then, the project has seen a steady growth in funding. Setting up the experiment. c_int), constants (e. 1 Application programs and C library The programmer who writes the canonical program. Introduction Functional Categories. We use cookies for various purposes including analytics. In addition, the library provides the basic startup code needed by most applications. The function does not check for any terminating null character in source - it always copies exactly num bytes. The standard name for the standard C library is "The Standard C Library". As of Oreo, libm is complete. Our attack combines a large number of short instruction sequences to build gadgets that allow arbitrary computation. They are good at hiding some of the confusing features of embedded. musl is an implementation of the userspace portion of the standard library functionality described in the ISO C and POSIX standards, plus common extensions. Outputting a string to STDOUT with our libc functions pthread_create symbols in libpthread, libthread and libc Segmentation fault in vsnprintf() from /lib64/tls/libc. 158) _____ 158) Thus, a signal handler cannot, in general, call standard library functions. This serves calling constructors and other library initialization which is necessary before calling main. backtrace() returns a backtrace for the calling program, in the array pointed to by buffer. Its goal is to prepare the arguments for a function named __libc_start_main and call it. Arithmetic Functions. I need to use some libc functions and types (localtime_r, tm, ) but there's very confusing situation with libc (they say it is deprecated) and it even couldn't be found by. Some of these are for internal use in the processing of exceptions or variable-length argument lists and are not documented here because they may change from time to time; we do not recommend general use of these functions. You can privately contact the project stewards by emailing [email protected] Some UNIX's (Solaris 2. libc provides all of the definitions necessary to easily interoperate with C code (or "C-like" code) on each of the platforms that Rust supports. I want to write code only in C++ file and all the logic of symbol fishing (dlsym) must be in C++ file. Now the ball is on libc's hand. function in the libc library, which is already loaded into the memory. This means that even if they never call system , the code for system (and every other function in libc ) is accessible at runtime. However, this application is limited and applies only to dialects after C++17. If you do not have much experience in programming it is probably better to stick with Arduino libraries. !But! it's actually present at a specific time during the install phase as it's being complied from source - it's just deleted at the end of the compilation process. lib" So here is what I did: I made a static lib with a single function in it. */ 1842: static void *malloc_hook_ini. "although not with the latest best performance" , It means that the tool sets have the best performance for the Cortex-M/R and not have the best performance for Cortex-A. The AVR hardware clears the global interrupt flag in SREG before entering an interrupt vector. At the same time AVR Libc has proven printf(), puts() and getchar() functions. This module is able to switch micro to STOP mode or HALT mode. why memcpy,strcmp. Following is the declaration for fopen() function. - Data Type: cookie_read_function This is the data type that the read function for a custom stream should have. ctypes is a foreign function library for Python. As of Oreo, libm is complete. Other interfaces listed above for libc shall behave as described in the referenced base document. The problem is, can you guarantee that the glibc function will never call a throwing function (directly or indirectly)? I would assume so, but I don't know - I said it was a guess and e. `_sbrk_r' is called with a positive value to allocate more space, and with a negative value to release previously allocated space if it is no longer required. Show how to call a function in a shared library (without dynamically linking to it at compile-time). You can privately contact the project stewards by emailing [email protected] The limbic system is the portion of the brain that deals with three key functions: emotions, memories and arousal (or stimulation). If we follow the call chain through from __libc_csu_init we can see it does some setup and then calls the _init function in the executable. There are also POSIX functions such as the endpwent/getpwent/setpwent family that are inapplicable to Android because it lacks a passwd database. Many of the functions described in the section are part of the Standard C Library (libc). thank your answer! I also study some documention including the readme and know about the --specs. This includes type definitions (e. LIBC(7) Linux Programmer's Manual LIBC(7) NAME top libc - overview of standard C libraries on Linux DESCRIPTION top The term "libc" is commonly used as a shorthand for the "standard C library", a library of standard functions that can be used by all C programs (and sometimes by programs in other languages). musl provides strong guarantees of the POSIX-specified side effects being observed when a function which is a cancellation point is cancelled: either the side effects are as if the function returned failure with a status of EINTR, or the function returns success and does not act on cancellation. AVR Libc supports both these paradigms. In fact we can use this search function to find close elements (below a threshold) by writing a customized compare function. The AVR hardware clears the global interrupt flag in SREG before entering an interrupt vector. The Lafayette High School Band program consists of the marching band, concert bands, jazz band, percussion ensemble, and color guard. You can vote up the examples you like or vote down the ones you don't like. "libc++" C++ Standard Library. Musl and glibc are two implementations of libc, as in the standard C library. Rather than adding these new utility functions to libc, it may well be worth adding them to a new separate library, which is portable and works under your operating system and your host operating system. 159 file size reduction from 1164 to 692 kilobytes. ctypes is a foreign function library for Python. The C library function FILE *fopen(const char *filename, const char *mode) opens the filename pointed to, by filename using the given mode. c and the startup assembly is system_stm32f4xx. 59 Other Built-in Functions Provided by GCC. 158) _____ 158) Thus, a signal handler cannot, in general, call standard library functions. lib and copied it to the lib folder of visual c 8. Fuchsia's libc does not, therefore, have a notion of signal-safe functions, and is not implemented internally to be aware of mechanisms like signals. 2 Variadic Functions) and non-local exits (see section 23. Description. backtrace() returns a backtrace for the calling program, in the array pointed to by buffer. Application compatibility improvements in getaddrinfo, getopt_long, and other functions have been made, and various additional low-impact bugs have been fixed. When the Android developers came to implement these heap functions, they wisely chose to use an existing, battle tested implementation instead of rolling their own. A complex and large computer program can be broken up into many more manageable subprograms. In this lab, students are given a program with a buffer-overflow vulnerability; their task is to develop a return-to-libc attack to exploit the vulnerability and finally to gain the root privilege. 2 General information about this library. File encoding. From this function's point of view, dummy_int32 will be the return address, and arg_1, arg_2 and the following words - the arguments. They are good at hiding some of the confusing features of embedded. The only other source file i include besides my main. These include absolute value, maximum and minimum, normalization, bit twiddling, rounding, and a few others. The following example shows the usage of system() function to list down all the files and directories in the current directory under windows machine. confstr() can already be used in pure Python! Sadly, these functions (confstr(_CS_GNU_LIBC_VERSION) / gnu_get_libc_version()) are specific to glibc. Now the ball is on libc's hand. As of Oreo, libm is complete. Choose three. a isn't present on your system after you've installed the imap-uw package. appear before any use of the variables in a function (arena. the exponential and trigonometric functions), where results often have to be computed to a fairly large precision to get last bit accuracy in a result that is to be stored in an IEEE-754 double variable. So for example, if one OS maintainer compiles libc with gcc version 5. The GNU C library provides several header files, each of which contains the type and macro definitions and variable and function declarations for a group of related facilities. LIBC(7) Linux Programmer's Manual LIBC(7) NAME top libc - overview of standard C libraries on Linux DESCRIPTION top The term "libc" is commonly used as a shorthand for the "standard C library", a library of standard functions that can be used by all C programs (and sometimes by programs in other languages). ctypes is a foreign function interface module for Python (included with Python 2. The C standard libraries and C++ STL are examples of shared components which can be linked with your code. Export _elf_aux_info() as new public libc function elf_aux_info(3) The elf_aux_info(3) should be considered as FreeBSD counterpart of glibc. lib exports are already there, so all you need to do is "fool" the compiler. The following dynamic memory functions are replaced:. How to calculate the address of a function in the LIBC, when ASLR is not active. Some functions are part of other libraries (e. Musl and glibc are two implementations of libc, as in the standard C library. Unfortunately, PEDA is not capable of doing the __libc_start_main() trick shown in Figure 1. Refer to the ChangeLog-0. They are extracted from open source Python projects. $ cat libc001. libc attacks, it was considered worthwhile to invest in de-ploying W⊕X. Together, avr-binutils, avr-gcc, and avr-libc form the heart of the Free Software toolchain for the Atmel AVR microcontrollers. Following is the declaration for fopen() function. The new libc binary was then copied to the target file system and a smoke test of booting the ARM development board was done. As of the writing of this reference, the current version of avr-libc was 20020115. When using "varargs" functions, %al (low byte of %rax) must specify the number of SSE registers (up to 8) that are being used for floating point arguments. For information on designing an application to use threads, please consult a multithreaded programming book. Note that virtually all implementations of the standard library extend the library with non-standard functions. Should I make all wrapper function (ocall) of libc for using libc functions in enclave? when I see some example code of others, They make only wrapper functions of libc functions like open, read, mkdir. There are also POSIX functions such as the endpwent/getpwent/setpwent family that are inapplicable to Android because it lacks a passwd database. Mac OS X client install notes with DarwinPorts The c-client. libc provides all of the definitions necessary to easily interoperate with C code (or "C-like" code) on each of the platforms that Rust supports. You can vote up the examples you like or vote down the ones you don't like. CONTENTS i Contents 1 AVR Libc 1 1. The limbic system is the portion of the brain that deals with three key functions: emotions, memories and arousal (or stimulation). There are two source of documentation for libc. The size of function is given in view of all picked up functions. dll with your applications, then make sure you remove the dynamic library from the search path of your compiler. 159 file size reduction from 1164 to 692 kilobytes. There is only one "main" program, the other subprograms are called subroutines or functions. Note that the __libc_init is so special. So for example, if one OS maintainer compiles libc with gcc version 5. I do not think there is function, which allows you to sleep task. Rather than adding these new utility functions to libc, it may well be worth adding them to a new separate library, which is portable and works under your operating system and your host operating system. By continuing to use Pastebin, you agree to our use of cookies as described in the Cookies Policy. CONTENTS i Contents 1 AVR Libc 1 1. 4, another uses gcc version 6. Yes, but I'm talking about *my* system that results (by default) in an empty _init() function, in an empty _preinit_array[] array and in a. Application compatibility improvements in getaddrinfo, getopt_long, and other functions have been made, and various additional low-impact bugs have been fixed. function in the libc library, which is already loaded into the memory. Arc-injection / Return-to-Libc Attack However, a program already has a lot of code that are useful to the attacker Particularly, libc has a lot of useful functions - libc is the "C standard library" - libc provides macros, type definitions, and functions for tasks like string handling, mathematical. so, because the string functions just operate on the pointers they're given, you can infer that strlen(3) was called with a null pointer; and this crash should go straight to the author of the calling code. filename − This is the C string containing the name of the file to be opened. Export _elf_aux_info() as new public libc function elf_aux_info(3) The elf_aux_info(3) should be considered as FreeBSD counterpart of glibc. However, for this method to work effectively the gLibc's version of the remote server needs to be the same as ours. Hi everyone, I'm trying to compile a f90 program in 32bits with ifort v8. dll with your applications, then make sure you remove the dynamic library from the search path of your compiler. Table of Contents. The Glibc package contains the main C library. There is a good description about this as well on gcc - understanding the __libc_init_array - Stack Overflow. This function is also part of glibc and lives in csu/libc-start. The system function, as already mentioned, is a standard C function, which means that it will surely exist in the libc. So where is this __libc_init_array function coming from? Why is it causing an exception (kicking my micro to the exception. This offset does not change by ASLR. It will use different syscall numbers, argument size and order and "extra options" will be different, some kernels will have a more general syscall with options that enable it to be used for a handful of similar standard libc wrapper functions. Note: do not replace the driver on a. This method operates by using small. asm extern puts section. Musl and glibc are two implementations of libc, as in the standard C library. As I wrote, I prefer to not write a new function C, if os. If you want to use routines like printf, strcmp, strcopy, memmove, getch, toupper, etc in your operating system, you have to either port them over from an existing C library, or write them yourself. Since these functions do not reside on the stack, we can bypass the stack protection and execute code. This offset does not change by ASLR. Because of this fact, libc functions will not EINTR, and it is not necessary for Fuchsia-only code to consider that case. This chapter describes functions for manipulating dates and times, including functions for determining what time it is and conversion between different time representations.  I’m putting the introduction from AVR GCC Reference manual as it is: “This file declares the standard IO facilities that are implemented in avr-libc. I found libc's address by using "ldd vuln", and found system's Stack Exchange Network Stack Exchange network consists of 175 Q&A communities including Stack Overflow , the largest, most trusted online community for developers to learn, share their knowledge, and build their careers. overwritten the return address with the address of a function in libc, put a dummy return address for the function to return too after the function is called, and before it the arguments to the function we want to call are pushed backwards on stack. The typical way of finding function addresses is by calculating the offset to the desired function from the address of another function in the same library that we have leaked. backtrace() returns a backtrace for the calling program, in the array pointed to by buffer. In this case, we do not use thumb mode, so we directly jump to main. Source code of the PEDA function to find an initial place to break at. These tricks are widely documented, so these are mostly notes for me. With current interfaces to GNU Binutils it is however not possible to incrementally link LTO objects and non-LTO objects into a single mixed object file. These functions are provided for obtaining the absolute value (or magnitude) of a number. Some library facilities, such as those for dealing with variadic arguments (see section A. The size totals for glibc include the size of iconv modules, roughly 5M, in the "Complete. But you can add your own driver, or just replace calls to them with dummies (or use named pipes from a dummy for testing) instead. They are good at hiding some of the confusing features of embedded. c uses one). There are two source of documentation for libc. At the same time AVR Libc has proven printf(), puts() and getchar() functions. Although bionic aims to implement all of C11 and POSIX, there are still (as of Oreo) about 70 POSIX functions missing from libc. Fast, light, robust. I found libc's address by using "ldd vuln", and found system's Stack Exchange Network Stack Exchange network consists of 175 Q&A communities including Stack Overflow , the largest, most trusted online community for developers to learn, share their knowledge, and build their careers. It was developed at the same time as the C library POSIX specification, which is a superset of it. You can see that we're using the types provided by the C pseudo-package. There are two source of documentation for libc. OK, I Understand. Source code of the PEDA function to find an initial place to break at. The GNU C library provides several header files, each of which contains the type and macro definitions and variable and function declarations for a group of related facilities. so set" figure. The typical way of finding function addresses is by calculating the offset to the desired function from the address of another function in the same library that we have leaked. Some UNIX's (Solaris 2. Comparatively speaking, by the second branch, the executables provided by Android jump not to main but to the stub for arm-to-thumb interwork. This means that even if they never call system , the code for system (and every other function in libc ) is accessible at runtime. txt 2014-4-3 下午7:21于 "Ray Zhang" 写道: > New question #246459 on GCC ARM Embedded:. Some functions are part of other libraries (e. $ cat libc001. 4, another uses gcc version 6. - Data Type: cookie_read_function This is the data type that the read function for a custom stream should have. It provides C compatible data types, and allows calling functions in DLLs or shared libraries. If you are looking for general avr-gcc time. New Documentation Coming Soon! Looking for documentation on how to use, build and test libc++?. Calling C functions¶. "although not with the latest best performance" , It means that the tool sets have the best performance for the Cortex-M/R and not have the best performance for Cortex-A. File encoding. We present new techniques that allow a return-into-libc attack to be mounted on x86 executables that calls no functions at all. 159 file size reduction from 1164 to 692 kilobytes. There are some questions about the choice of Epoch used in the AVR-Libc time functions. One year ago, I quit my day job to work on Zig full time. This method operates by using small. CONTENTS i Contents 1 AVR Libc 1 1. If /sbin/init and /bin/sh managed with the new libc, the test was a success while everything else was a failure. The set*id() family of functions are now safer (including async-signal safety and safety against partial privilege-retention issues) in multi-threaded programs. Source code of the PEDA function to find an initial place to break at. The library includes a great number of useful mathematical functions for manipulating floating point numbers. __libc_start_main is a function in libc. Most are interfaces to the MS-Windows Win32 API. There are also POSIX functions such as the endpwent/getpwent/setpwent family that are inapplicable to Android because it lacks a passwd database. All lr-libc functions should include some example code as well as clear documentation describing the purpose of the function and any caveats. c_int), constants (e. Function and Macro Index. With current interfaces to GNU Binutils it is however not possible to incrementally link LTO objects and non-LTO objects into a single mixed object file. The behaviour of these functions may vary slightly from those defined by ANSI, and these deviations are noted in the text. Additionally, it contains some assorted platform-specific definitions. You can vote up the examples you like or vote down the ones you don't like. The following are code examples for showing how to use ctypes. 031) on a x86-64 system (redhat 4. a good function should deal with unwanted parameters. The prototype and data definitions of the functions are present in their respective header files, and must be included in your program to access them. Our attack combines a large number of short instruction sequences to build gadgets that allow arbitrary computation. * The twalk_r function has been added. In this case, we do not use thumb mode, so we directly jump to main. This function is also part of glibc and lives in csu/libc-start. To prevent additional breakage, overwrite all. By default Avr-libc is compiled with -mcall-prologues option. etc ,these libc functions, do not accept NULL pointer ? called with NULL, just get segment. I wish someone of the Linux libc developers would write this chapter. h instead of the libc string functions. function in the libc library, which is already loaded into the memory. The C library function FILE *fopen(const char *filename, const char *mode) opens the filename pointed to, by filename using the given mode. By joining our community you will have the ability to post topics, receive our newsletter, use the advanced search, subscribe to threads and access many other special features. How to wrap a system call (libc function) in Linux Sep 5, 2014 · 8 minute read · Comments Linux Geeky Programming C System call For one of my research projects I had to wrap linux system calls and redirect them to another thread. filename − This is the C string containing the name of the file to be opened. */ 1838 # define weak_variable weak_function: 1839 # endif: 1840: 1841 /* Forward declarations. It only needs a library with the name "libc. Discussing time in a technical manual can be difficult because the word "time" in English refers to lots of different things. It was started in the early 1990s by the Free Software Foundation (FSF) for their GNU operating system. The behaviour of these functions may vary slightly from those defined by ANSI, and these deviations are noted in the text. Together, avr-binutils, avr-gcc, and avr-libc form the heart of the Free Software toolchain for the Atmel AVR microcontrollers. The AVR Libc package provides a subset of the standard C library for Atmel AVR 8-bit RISC microcontrollers. This method operates by using small. There are two source of documentation for libc. 5+) are re-entrant and theoretically could support a kernel module making a syscall, but again, the problems are similar - extreme care has to be taken to ensure that bad things dont happen. confstr() can already be used in pure Python! Sadly, these functions (confstr(_CS_GNU_LIBC_VERSION) / gnu_get_libc_version()) are specific to glibc. If you know how to enter an array formula with Ctrl-Shift-Enter, you will find that calling the TA-Lib functions is very easy. This means that even if they never call system , the code for system (and every other function in libc ) is accessible at runtime. Transcendental functions in glibc are implemented as multiple phases. The C library provides functions to do basic operations on floating-point numbers. If you want to use routines like printf, strcmp, strcopy, memmove, getch, toupper, etc in your operating system, you have to either port them over from an existing C library, or write them yourself. LibGW32C: GNU C library Version. CONTENTS iv 7. This example comes with a small number of standard functions that serve as examples and serve to satisfy ABI requirements. In this lab, students are given a program with a buffer-overflow vulnerability; their task is to develop a return-to-libc attack to exploit the vulnerability and finally to gain the root privilege. Source code of the PEDA function to find an initial place to break at. Some functions are part of other libraries (e. 1 release tarball. ctypes is a foreign function library for Python. The latest Tweets from musl libc (@musllibc). Most are interfaces to the MS-Windows Win32 API. The trick is to realize that programs that use functions from a shared library, like printf from libc, will link the entire library into their address space at run time. c,random,syscall,libc. In addition, the library provides the basic startup code needed by most applications. They are good at hiding some of the confusing features of embedded. Export functions, variables, and types for C code to depend on § One of the primary use cases for Zig is exporting a library with the C ABI for other programming languages to call into. It allows more rapid development and makes sure that your libc functions do the same as the ones on your host system. */ 1838 # define weak_variable weak_function: 1839 # endif: 1840: 1841 /* Forward declarations. Some are just dummy functions that do nothing. There are also POSIX functions such as the endpwent/getpwent/setpwent family that are inapplicable to Android because it lacks a passwd database. The C standard libraries and C++ STL are examples of shared components which can be linked with your code. Note that the __libc_init is so special. Note that we must match the function signature of the original libc function. a, the archive version of libc. Well, it's been more than 2. By default Avr-libc is compiled with -mcall-prologues option. 0 Reference Manual Part I - Introduction. "although not with the latest best performance" , It means that the tool sets have the best performance for the Cortex-M/R and not have the best performance for Cortex-A. */ 1842: static void *malloc_hook_ini. After C++17 the C++ standard has started to declared such library functions as [[nodiscard]]. avr-libc is maintained by Marek Michalkiewicz. `_sbrk_r' is called with a positive value to allocate more space, and with a negative value to release previously allocated space if it is no longer required. Unlike a typical shellcode. Now the ball is on libc's hand. 1, is no longer provided. the exponential and trigonometric functions), where results often have to be computed to a fairly large precision to get last bit accuracy in a result that is to be stored in an IEEE-754 double variable. It only needs a library with the name "libc. You are currently viewing LQ as a guest. To avoid overflows, the size of the arrays pointed to by both the destination and source parameters, shall be at least num bytes, and should not overlap (for overlapping memory blocks, memmove is a safer approach). If you do not use operating system, there is nothing like task. How to calculate the address of a function in the LIBC, when ASLR is not active. libc attacks, it was considered worthwhile to invest in de-ploying W⊕X. LibGW32C: GNU C library Version. Some of the functions have been found generally useful and they are listed below. These are some examples of using the perf Linux profiler, which has also been called Performance Counters for Linux (PCL), Linux perf events (LPE), or perf_events. Function and Macro Index. In the body of our function, we could re-implement the original libc function, however it's probably easier for us just to call the original libc function. Conveniently, we can summarize what happens between _start and the call to main as "set up a bunch of stuff for libc and then call main', and since we don't care about libc, let's just export our own _start symbol that just calls main and link against that:. Some library facilities, such as those for dealing with variadic arguments (see section A. There is a good description about this as well on gcc - understanding the __libc_init_array - Stack Overflow. Comparatively speaking, by the second branch, the executables provided by Android jump not to main but to the stub for arm-to-thumb interwork. It can be used to wrap these libraries in pure Python. This method operates by using small. Refer to the ChangeLog-0. This function is also part of glibc and lives in csu/libc-start. Application compatibility improvements in getaddrinfo, getopt_long, and other functions have been made, and various additional low-impact bugs have been fixed. The exact set of functions available are platform specific. It is similar to the existing twalk function, but it passes an additional caller-supplied argument to the callback function. The Geometry of Innocent Flesh on the Bone: Return-into-libc without Function Calls (on the x86) Hovav Shacham [email protected] # It allows the compiler to do whatever special optimizations it pleases on calls to these functions, without the possibility that they may have been redefined by the user. 1 release tarball. The behaviour of these functions may vary slightly from those defined by ANSI, and these deviations are noted in the text. Below is an example search function that can be used for any data type. In this case, we do not use thumb mode, so we directly jump to main. Wrapping Linux shared library functions. so set" figure. so) are dynamically linked position-independent code, it makes no difference under the hood: the functions that are called from a library that has. txt 2014-4-3 下午7:21于 "Ray Zhang" 写道: > New question #246459 on GCC ARM Embedded:. Using 'libc' functions in a STREAM 64-bit module 807567 Mar 1, 2001 5:38 PM Hi, Finally I got to compile and load the STREAM module, the problem I had was a matter of the compiler I was using. c_int), constants (e. The geometry of innocent flesh on the bone: Return-into-libc without function calls (on x86) - Shacham 2007 Yesterday we saw that Data Execution Prevention W⊕X is one of the widely deployed defenses against code corruption attacks. For convenience, most functions and types are reexported, so use libc::* will import the available C bindings as appropriate for the target platform. There is a weath of useful functions contained in the AVR-libc libraries that can be found here. text global _start _start: mov rdi, message call puts wrt. "although not with the latest best performance" , It means that the tool sets have the best performance for the Cortex-M/R and not have the best performance for Cortex-A. gdb$ p execve - strcpy $1 = 0x25ba0. The standard name for the standard C library is "The Standard C Library".