From 3d08cd331c1adcf0d917392f7e527b3f00511748 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Fri, 24 May 2024 06:52:22 +0200 Subject: Merging upstream version 6.8. Signed-off-by: Daniel Baumann --- man3/stdin.3 | 160 ----------------------------------------------------------- 1 file changed, 160 deletions(-) delete mode 100644 man3/stdin.3 (limited to 'man3/stdin.3') diff --git a/man3/stdin.3 b/man3/stdin.3 deleted file mode 100644 index 42ed937..0000000 --- a/man3/stdin.3 +++ /dev/null @@ -1,160 +0,0 @@ -.\" From dholland@burgundy.eecs.harvard.edu Tue Mar 24 18:08:15 1998 -.\" -.\" This man page was written in 1998 by David A. Holland -.\" Polished a bit by aeb. -.\" -.\" %%%LICENSE_START(PUBLIC_DOMAIN) -.\" Placed in the Public Domain. -.\" %%%LICENSE_END -.\" -.\" 2005-06-16 mtk, mentioned freopen() -.\" 2007-12-08, mtk, Converted from mdoc to man macros -.\" -.TH stdin 3 2023-10-31 "Linux man-pages 6.7" -.SH NAME -stdin, stdout, stderr \- standard I/O streams -.SH LIBRARY -Standard C library -.RI ( libc ", " \-lc ) -.SH SYNOPSIS -.nf -.B #include -.P -.BI "extern FILE *" stdin ; -.BI "extern FILE *" stdout ; -.BI "extern FILE *" stderr ; -.fi -.SH DESCRIPTION -Under normal circumstances every UNIX program has three streams opened -for it when it starts up, one for input, one for output, and one for -printing diagnostic or error messages. -These are typically attached to -the user's terminal (see -.BR tty (4)) -but might instead refer to files or other devices, depending on what -the parent process chose to set up. -(See also the "Redirection" section of -.BR sh (1).) -.P -The input stream is referred to as "standard input"; the output stream is -referred to as "standard output"; and the error stream is referred to -as "standard error". -These terms are abbreviated to form the symbols -used to refer to these files, namely -.IR stdin , -.IR stdout , -and -.IR stderr . -.P -Each of these symbols is a -.BR stdio (3) -macro of type pointer to -.IR FILE , -and can be used with functions like -.BR fprintf (3) -or -.BR fread (3). -.P -Since -.IR FILE s -are a buffering wrapper around UNIX file descriptors, the -same underlying files may also be accessed using the raw UNIX file -interface, that is, the functions like -.BR read (2) -and -.BR lseek (2). -.P -On program startup, the integer file descriptors -associated with the streams -.IR stdin , -.IR stdout , -and -.I stderr -are 0, 1, and 2, respectively. -The preprocessor symbols -.BR STDIN_FILENO , -.BR STDOUT_FILENO , -and -.B STDERR_FILENO -are defined with these values in -.IR . -(Applying -.BR freopen (3) -to one of these streams can change the file descriptor number -associated with the stream.) -.P -Note that mixing use of -.IR FILE s -and raw file descriptors can produce -unexpected results and should generally be avoided. -(For the masochistic among you: POSIX.1, section 8.2.3, describes -in detail how this interaction is supposed to work.) -A general rule is that file descriptors are handled in the kernel, -while stdio is just a library. -This means for example, that after an -.BR exec (3), -the child inherits all open file descriptors, but all old streams -have become inaccessible. -.P -Since the symbols -.IR stdin , -.IR stdout , -and -.I stderr -are specified to be macros, assigning to them is nonportable. -The standard streams can be made to refer to different files -with help of the library function -.BR freopen (3), -specially introduced to make it possible to reassign -.IR stdin , -.IR stdout , -and -.IR stderr . -The standard streams are closed by a call to -.BR exit (3) -and by normal program termination. -.SH STANDARDS -C11, POSIX.1-2008. -.P -The standards also stipulate that these three -streams shall be open at program startup. -.SH HISTORY -C89, POSIX.1-2001. -.SH NOTES -The stream -.I stderr -is unbuffered. -The stream -.I stdout -is line-buffered when it points to a terminal. -Partial lines will not -appear until -.BR fflush (3) -or -.BR exit (3) -is called, or a newline is printed. -This can produce unexpected -results, especially with debugging output. -The buffering mode of the standard streams (or any other stream) -can be changed using the -.BR setbuf (3) -or -.BR setvbuf (3) -call. -Note that in case -.I stdin -is associated with a terminal, there may also be input buffering -in the terminal driver, entirely unrelated to stdio buffering. -(Indeed, normally terminal input is line buffered in the kernel.) -This kernel input handling can be modified using calls like -.BR tcsetattr (3); -see also -.BR stty (1), -and -.BR termios (3). -.SH SEE ALSO -.BR csh (1), -.BR sh (1), -.BR open (2), -.BR fopen (3), -.BR stdio (3) -- cgit v1.2.3