Libc
Un article de Haypo.
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| - | * [[errno]] | + | * [[errno]], [[Signaux]] et [[Syscall]] |
Version du 8 janvier 2008 à 23:47
Retour aux articles de programmation
« libc » ou « bibliothèque standard C ».
Sommaire |
Saveurs
- GNU libc
- Auteur initial : Roland McGrath
- Mainteneur : le dictateur Ulrich Drepper
- Licence GNU LGPL
- Documentation : The GNU C Library manual
- Lire son code source en ligne
- uClibc
- Ne nécessite pas de MMU
- Écrite pour fonctionner sur un microcontrôleur
- Licence GNU LGPL
Documentation
Variables de la GNU libc
Ces informations proviennent de la liste variables d'environnement de la libc écrite pour Scratchbox.
liaison des symboles (ld.so)
- LD_BIND_NOT: Flag: if set, Don't update the GOT (global offset table) and PLT (procedure linkage table) after resolving a symbol
- LD_BIND_NOW: Flag: Resolve all symbols at program startup, useful with debugger
- LD_DEBUG: Output verbose debugging information about the dynamic linker. If set to 'all' prints all debugging information it has, if set to 'help' prints a help message
- LD_DEBUG_PATH: Filename for LD_DEBUG output (otherwise it goes to stdout)
- LD_LIBRARY_PATH: A colon-separated list of directories in which to search for ELF libraries at execution-time
- LD_PRELOAD: A whitespace-separated list of additional, user-specified, ELF shared libraries to be loaded before all others. This can be used to selectively override functions in other shared libraries. For setuid/setgid ELF binaries, only libraries in the standard search directories that are also setuid will be loaded
- LD_ORIGIN_PATH : Path where the binary is found
- LD_PROFILE : Shared object to be profiled
- LD_PROFILE_OUTPUT : File where LD_PROFILE output should be stored, default is stdout
- LD_TRACE_LOADED_OBJECTS Flag: if set, list dependencies instead of running (like ldd!)
- LD_WARN Flag: if set, warn about about undefined symbols
- LD_VERBOSE Flag: If set, output symbol versioning information about the program if querying information about it (see LD_TRACE_LOADED_OBJECTS)
Pour plus d'information sur le linker dynamique, lire « man ld.so ».
Debug
- SEGFAULT_SIGNALS: List of signals generating segfault: segv, ill, bus, stkflt, abrt, fpe
- SEGFAULT_USE_ALTSTACK: Flag: if set, allocate separate stack for segfaults
Note: 'catchsegv' is a shell script coming with glibc which LD_PRELOADs binaries with segfault library understanding above variables.
- SEGFAULT_OUTPUT_NAME : Name of the output (backtrace etc) file (default is stderr)
- MALLOC_CHECK_ : Set what to do when corrupt pointer is detected with malloc debugging:
- 0: do nothing
- 1: print an error message (default)
- 2: call abort()
- MSGVERB SEV_LEVEL : Mask of msgfmt() values to print (label, severity, text, action, tag) and severity level setting for msgfmt()
- GMON_OUT_PREFIX : Change -pg (gcc profiling option) output file from default 'gmon.out' to"${GMON_OUT_PREFIX}.${PID}"
Traduction
- LC_CTYPE: Character classification and case conversion
- LC_TIME Date and time formats
- ...
- LC_MESSAGES: Formats of informative and diagnostic messages and interactive responses
- LC_ALL: Overrides the locales selected by other LC_* variables
- LANG: Which message catalog to use
- LANGUAGE: Overrides LANG and LC_* settings for message catalogs
Chemins
- HOME: User's home directory
- IFS: Field separator (e.g. in path lists)
- PATH: Paths from which executables can be run from
- PWD: Working directory
- TMPDIR: Temporary directory path
