стандартные потоки ввода / вывода (standard I/O streams)
Пролог (Prolog)
This manual page is part of the POSIX Programmer's Manual. The
Linux implementation of this interface may differ (consult the
corresponding Linux manual page for details of Linux behavior),
or the interface may not be implemented on Linux.
Имя (Name)
stderr, stdin, stdout — standard I/O streams
Синопсис (Synopsis)
#include <stdio.h>
extern FILE *stderr, *stdin, *stdout;
Описание (Description)
The functionality described on this reference page is aligned
with the ISO C standard. Any conflict between the requirements
described here and the ISO C standard is unintentional. This
volume of POSIX.1‐2017 defers to the ISO C standard.
A file with associated buffering is called a stream and is
declared to be a pointer to a defined type FILE. The fopen()
function shall create certain descriptive data for a stream and
return a pointer to designate the stream in all further
transactions. Normally, there are three open streams with
constant pointers declared in the <stdio.h> header and associated
with the standard open files.
At program start-up, three streams shall be predefined and need
not be opened explicitly: standard input (for reading
conventional input), standard output (for writing conventional
output), and standard error (for writing diagnostic output). When
opened, the standard error stream is not fully buffered; the
standard input and standard output streams are fully buffered if
and only if the stream can be determined not to refer to an
interactive device.
The following symbolic values in <unistd.h> define the file
descriptors that shall be associated with the C-language stdin,
stdout, and stderr when the application is started:
STDIN_FILENO Standard input value, stdin. Its value is 0.
STDOUT_FILENO Standard output value, stdout. Its value is 1.
STDERR_FILENO Standard error value, stderr. Its value is 2.
The stderr stream is expected to be open for reading and writing.
Возвращаемое значение (Return value)
None.
Ошибки (Error)
No errors are defined.
The following sections are informative.
Примеры (Examples)
None.
Использование в приложениях (Application usage)
None.
Обоснование (Rationale)
None.
Будущие направления (Future directions)
None.
Смотри также (See also)
fclose(3p), feof(3p), ferror(3p), fileno(3p), fopen(3p),
fprintf(3p), fread(3p), fscanf(3p), fseek(3p), getc(3p),
gets(3p), popen(3p), putc(3p), puts(3p), read(3p), setbuf(3p),
setvbuf(3p), tmpfile(3p), ungetc(3p), vfprintf(3p)
The Base Definitions volume of POSIX.1‐2017, stdio.h(0p),
unistd.h(0p)
