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getwd (3)
  • getwd (3) ( Solaris man: Библиотечные вызовы )
  • >> getwd (3) ( FreeBSD man: Библиотечные вызовы )
  • getwd (3) ( Русские man: Библиотечные вызовы )
  • getwd (3) ( Linux man: Библиотечные вызовы )
  • getwd (3) ( POSIX man: Библиотечные вызовы )

  • BSD mandoc
     

    NAME

    
    
    getcwd
    
     
    getwd
    
     - get working directory pathname
    
     
    

    LIBRARY

    Lb libc
    
     
    

    SYNOPSIS

       #include <unistd.h>
    char * getcwd (char *buf size_t size);
    char * getwd (char *buf);
     

    DESCRIPTION

    The getcwd ();
    function copies the absolute pathname of the current working directory into the memory referenced by Fa buf and returns a pointer to Fa buf . The Fa size argument is the size, in bytes, of the array referenced by Fa buf .

    If Fa buf is NULL space is allocated as necessary to store the pathname. This space may later be free(3)Ns'd.

    The function getwd ();
    is a compatibility routine which calls getcwd ();
    with its Fa buf argument and a size of MAXPATHLEN (as defined in the include file In sys/param.h ) . Obviously, Fa buf should be at least MAXPATHLEN bytes in length.

    These routines have traditionally been used by programs to save the name of a working directory for the purpose of returning to it. A much faster and less error-prone method of accomplishing this is to open the current directory (`.' ) and use the fchdir(2) function to return.  

    RETURN VALUES

    Upon successful completion, a pointer to the pathname is returned. Otherwise a NULL pointer is returned and the global variable errno is set to indicate the error. In addition, getwd ();
    copies the error message associated with errno into the memory referenced by Fa buf .  

    ERRORS

    The getcwd ();
    function will fail if:

    Bq Er EACCES
    Read or search permission was denied for a component of the pathname.
    Bq Er EINVAL
    The Fa size argument is zero.
    Bq Er ENOENT
    A component of the pathname no longer exists.
    Bq Er ENOMEM
    Insufficient memory is available.
    Bq Er ERANGE
    The Fa size argument is greater than zero but smaller than the length of the pathname plus 1.

     

    SEE ALSO

    chdir(2), fchdir(2), malloc(3), strerror(3)  

    STANDARDS

    The getcwd ();
    function conforms to St -p1003.1-90 . The ability to specify a NULL pointer and have getcwd ();
    allocate memory as necessary is an extension.  

    HISTORY

    The getwd ();
    function appeared in BSD 4.0  

    BUGS

    The getwd ();
    function does not do sufficient error checking and is not able to return very long, but valid, paths. It is provided for compatibility.


     

    Index

    NAME
    LIBRARY
    SYNOPSIS
    DESCRIPTION
    RETURN VALUES
    ERRORS
    SEE ALSO
    STANDARDS
    HISTORY
    BUGS


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