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NAME
       fopen, fdopen, freopen -


SYNOPSIS
       #include <stdio.h>

       FILE *fopen(const char *path, const char *mode);
       FILE *fdopen(int fildes, const char *mode);
       FILE *freopen(const char *path, const char *mode, FILE *stream);


DESCRIPTION
        fopen path

        mode ():

       r

       r+

       w

       w+

       a       ()

       a+      ()

         mode   ``b''   ANSI X3.159-1989 (``ANSI C'')  POSIX ``b''  Linux( I/O
       ``b''  Unix )

         S_IRUSR|S_IWUSR|S_IRGRP|S_IWGRP|S_IROTH|S_IWOTH   (0666)   umask    (
       umask(2))

       / ANSI C ()  ( Linux ) fseek fgetpos  ( fseek(..., 0L, SEEK_CUR) )(?)

        ( a mode )
              fseek(stream,0,SEEK_END);

         fdopen  fildes.  mode ( "r", "r+", "w", "w+", "a", "a+" ) fildes  "w"
       "w+" fdopen fdopen

        freopen path stream  () mode fopen freopen (stderr, stdin,  stdout)


RETURN VALUE
        fopen, fdopen freopen FILE NULL errno


ERRORS
       EINVAL  fopen, fdopen, freopen mode

        fopen, fdopen freopen errno malloc(3)

        fopen errno open(2)

        fdopen errno fcntl(2)

        freopen errno open(2), fclose(3) fflush(3)


CONFORMING TO
         fopen  freopen   ANSI   X3.159-1989   (``ANSI   C'')   fdopen    IEEE
       Std1003.1-1988 (``POSIX.1'')


SEE ALSO
       open(2), fclose(3), fileno(3)