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The LLVM C Library
The LLVM C Library

Using LLVM-libc

  • Getting Started
  • Build Concepts
  • Overlay Mode
  • Full Host Build
  • Full Cross Build
  • Configure Options
  • Hand-in-Hand

Platforms

  • libc for GPUs
    • Building libs for GPUs
    • Using libc for GPUs
    • Supported Functions
    • Remote Procedure Calls
    • Testing the GPU C library
    • Motivation and Limitations
  • libc for UEFI
    • Building libc for UEFI
    • Using libc for UEFI
    • Supported Functions
    • Testing the UEFI C library

Implementation Status

  • Implementation Status
    • aio.h
    • arpa/inet.h
    • assert.h
    • byteswap.h
    • complex.h
    • cpio.h
    • ctype.h
    • dirent.h
    • dlfcn.h
    • endian.h
    • errno.h
    • fcntl.h
    • fenv.h
    • float.h
    • glob.h
    • inttypes.h
    • libgen.h
    • locale.h
    • math.h
      • Log/Log10/Log2 Algorithm
    • net/if.h
    • netinet/in.h
    • netinet/tcp.h
    • nl_types.h
    • poll.h
    • pwd.h
    • sched.h
    • search.h
    • setjmp.h
    • signal.h
    • spawn.h
    • stdbit.h
    • stdfix.h
    • stdio.h
    • stdlib.h
    • string.h
    • strings.h
    • sys/ipc.h
    • sys/mman.h
    • sys/msg.h
    • sys/resource.h
    • sys/select.h
    • sys/sem.h
    • sys/socket.h
    • sys/stat.h
    • sys/statvfs.h
    • sys/time.h
    • sys/uio.h
    • sys/utsname.h
    • sys/wait.h
    • syslog.h
    • termios.h
    • threads.h
    • time.h
    • uchar.h
    • unistd.h
    • wchar.h
    • wctype.h
    • pthread.h
  • Architecture Support
  • Platform Support
  • Compiler Support

Development

  • Contributing to the libc Project
  • Building and Testing the libc
  • Developer Guides
    • Building the Documentation
    • The libc code style
    • LLVM-libc Source Tree Layout
    • Entrypoints in LLVM libc
    • Implementing a New Function
    • Adding new libc configure options
    • Date and Time
    • Fuzzing for LLVM-libc functions
    • Types of fuzz tests
    • Generating Public and Internal headers
    • Convention for implementing entrypoints
    • Defining Undefined Behavior
    • Printf Behavior Under All Conditions
    • GCC Compatibility of Builtins
    • Syscall Wrapper Refactoring
    • Modular format strings
    • Code Coverage
  • Bringup on a New OS or Architecture
  • LLVM-libc Maintainers
  • Inactive Maintainers

Links

  • Talks
  • Source Code
  • Bug Reports
  • Discourse
  • Join the Discord
  • Discord Channel
  • Buildbot
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sys/uio.h¶

Functions¶

Function

Implemented

C23 Standard Section

POSIX Docs

readv

✅

POSIX.1-2024

writev

✅

POSIX.1-2024
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