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POSIX 1003.1 - man page for stdio.h (posix section 0p)

<stdio.h>(P)			    POSIX Programmer's Manual			     <stdio.h>(P)

       stdio.h - standard buffered input/output

       #include <stdio.h>

       Some  of  the  functionality  described on this reference page extends the ISO C standard.
       Applications shall define the appropriate feature test macro (see  the  System  Interfaces
       volume  of  IEEE Std 1003.1-2001,  Section 2.2, The Compilation Environment) to enable the
       visibility of these symbols in this header.

       The <stdio.h> header shall define  the  following  macros  as  positive	integer  constant

       BUFSIZ Size of <stdio.h> buffers.

       _IOFBF Input/output fully buffered.

       _IOLBF Input/output line buffered.

       _IONBF Input/output unbuffered.

	      Maximum size of character array to hold ctermid() output.

	      Maximum size of character array to hold tmpnam() output.

	      Seek relative to current position.

	      Seek relative to end-of-file.

	      Seek relative to start-of-file.

       The  following  macros  shall  be  defined  as positive integer constant expressions which
       denote implementation limits:

	      Maximum size in bytes of the longest filename string that the implementation  guar-
	      antees can be opened.

	      Number  of  streams which the implementation guarantees can be open simultaneously.
	      The value is at least eight.

	      Minimum number of unique filenames generated by tmpnam(). Maximum number	of  times
	      an  application  can call tmpnam() reliably. The value of {TMP_MAX} is at least 25.
	       On XSI-conformant systems, the value of {TMP_MAX} is at least 10000.

       The following macro name shall be defined as a negative integer constant expression:

       EOF    End-of-file return value.

       The following macro name shall be defined as a null pointer constant:

       NULL   Null pointer.

       The following macro name shall be defined as a string constant:

	      Default directory prefix for tempnam().

       The following shall be defined as expressions of type "pointer to FILE" that point to  the
       FILE objects associated, respectively, with the standard error, input, and output streams:

       stderr Standard error output stream.

       stdin  Standard input stream.

       stdout Standard output stream.

       The following data types shall be defined through typedef:

       FILE   A structure containing information about a file.

       fpos_t A  non-array type containing all information needed to specify uniquely every posi-
	      tion within a file.

	      As described in <stdarg.h> .

       size_t As described in <stddef.h> .

       The following shall be declared as functions and may also be defined as	macros.  Function
       prototypes shall be provided.

	      void     clearerr(FILE *);

	      char    *ctermid(char *);

	      int      fclose(FILE *);

	      FILE    *fdopen(int, const char *);

	      int      feof(FILE *);
	      int      ferror(FILE *);
	      int      fflush(FILE *);
	      int      fgetc(FILE *);
	      int      fgetpos(FILE *restrict, fpos_t *restrict);
	      char    *fgets(char *restrict, int, FILE *restrict);

	      int      fileno(FILE *);

	      void     flockfile(FILE *);

	      FILE    *fopen(const char *restrict, const char *restrict);
	      int      fprintf(FILE *restrict, const char *restrict, ...);
	      int      fputc(int, FILE *);
	      int      fputs(const char *restrict, FILE *restrict);
	      size_t   fread(void *restrict, size_t, size_t, FILE *restrict);
	      FILE    *freopen(const char *restrict, const char *restrict,
			   FILE *restrict);
	      int      fscanf(FILE *restrict, const char *restrict, ...);
	      int      fseek(FILE *, long, int);

	      int      fseeko(FILE *, off_t, int);

	      int      fsetpos(FILE *, const fpos_t *);
	      long     ftell(FILE *);

	      off_t    ftello(FILE *);

	      int      ftrylockfile(FILE *);
	      void     funlockfile(FILE *);

	      size_t   fwrite(const void *restrict, size_t, size_t, FILE *restrict);
	      int      getc(FILE *);
	      int      getchar(void);

	      int      getc_unlocked(FILE *);
	      int      getchar_unlocked(void);

	      char    *gets(char *);

	      int      pclose(FILE *);

	      void     perror(const char *);

	      FILE    *popen(const char *, const char *);

	      int      printf(const char *restrict, ...);
	      int      putc(int, FILE *);
	      int      putchar(int);

	      int      putc_unlocked(int, FILE *);
	      int      putchar_unlocked(int);

	      int      puts(const char *);
	      int      remove(const char *);
	      int      rename(const char *, const char *);
	      void     rewind(FILE *);
	      int      scanf(const char *restrict, ...);
	      void     setbuf(FILE *restrict, char *restrict);
	      int      setvbuf(FILE *restrict, char *restrict, int, size_t);
	      int      snprintf(char *restrict, size_t, const char *restrict, ...);
	      int      sprintf(char *restrict, const char *restrict, ...);
	      int      sscanf(const char *restrict, const char *restrict, int ...);

	      char    *tempnam(const char *, const char *);

	      FILE    *tmpfile(void);
	      char    *tmpnam(char *);
	      int      ungetc(int, FILE *);
	      int      vfprintf(FILE *restrict, const char *restrict, va_list);
	      int      vfscanf(FILE *restrict, const char *restrict, va_list);
	      int      vprintf(const char *restrict, va_list);
	      int      vscanf(const char *restrict, va_list);
	      int      vsnprintf(char *restrict, size_t, const char *restrict, va_list;
	      int      vsprintf(char *restrict, const char *restrict, va_list);
	      int      vsscanf(const char *restrict, const char *restrict, va_list arg);

       Inclusion of the <stdio.h> header may also make visible all symbols from <stddef.h>.

       The following sections are informative.




       <stdarg.h>   ,	<stddef.h>   ,	 <sys/types.h>	 ,   the   System  Interfaces  volume  of
       IEEE Std 1003.1-2001, clearerr(), ctermid(), fclose(), fdopen(), fgetc(), fgetpos(),  fer-
       ror(),  feof(),	fflush(),  fgets(),  fileno(),	flockfile(),  fopen(),	fputc(), fputs(),
       fread(),  freopen(),  fseek(),  fsetpos(),  ftell(),  fwrite(),	getc(),  getc_unlocked(),
       getwchar(),  getchar(),	getopt(),  gets(), pclose(), perror(), popen(), printf(), putc(),
       putchar(), puts(), putwchar(), remove(), rename(), rewind(), scanf(), setbuf(), setvbuf(),
       sscanf(),  stdin, system(), tempnam(), tmpfile(), tmpnam(), ungetc(), vfscanf(), vscanf(),
       vprintf(), vsscanf()

       Portions of this text are reprinted and	reproduced  in	electronic  form  from	IEEE  Std
       1003.1,	2003  Edition,	Standard  for Information Technology -- Portable Operating System
       Interface (POSIX), The Open Group Base Specifications Issue 6, Copyright (C) 2001-2003  by
       the  Institute  of  Electrical  and  Electronics Engineers, Inc and The Open Group. In the
       event of any discrepancy between this version and the original IEEE  and  The  Open  Group
       Standard, the original IEEE and The Open Group Standard is the referee document. The orig-
       inal Standard can be obtained online at http://www.opengroup.org/unix/online.html .

IEEE/The Open Group			       2003				     <stdio.h>(P)

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