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[cstdio.syn]
# 31 Input/output library [[input.output]](./#input.output)
## 31.13 C library files [[c.files]](c.files#cstdio.syn)
### 31.13.1 Header <cstdio> synopsis [cstdio.syn]
[🔗](#header:%3ccstdio%3e)
#define __STDC_VERSION_STDIO_H__ 202311Lnamespace std {using size_t = *see [[support.types.layout]](support.types.layout "17.2.4 Sizes, alignments, and offsets")*; using FILE = *see below*; using fpos_t = *see below*;}#define NULL *see [[support.types.nullptr]](support.types.nullptr "17.2.3 Null pointers")*#define _IOFBF *see below*#define _IOLBF *see below*#define _IONBF *see below*#define BUFSIZ *see below*#define EOF *see below*#define FOPEN_MAX *see below*#define FILENAME_MAX *see below*#define _PRINTF_NAN_LEN_MAX *see below*#define L_tmpnam *see below*#define SEEK_CUR *see below*#define SEEK_END *see below*#define SEEK_SET *see below*#define TMP_MAX *see below*#define stderr *see below*#define stdin *see below*#define stdout *see below*namespace std {int remove(const char* filename); int rename(const char* old_p, const char* new_p);
FILE* tmpfile(); char* tmpnam(char* s); int fclose(FILE* stream); int fflush(FILE* stream);
FILE* fopen(const char* filename, const char* mode);
FILE* freopen(const char* filename, const char* mode, FILE* stream); void setbuf(FILE* stream, char* buf); int setvbuf(FILE* stream, char* buf, int mode, size_t size); int fprintf(FILE* stream, const char* format, ...); int fscanf(FILE* stream, const char* format, ...); int printf(const char* format, ...); int scanf(const char* format, ...); int snprintf(char* s, size_t n, const char* format, ...); int sprintf(char* s, const char* format, ...); int sscanf(const char* s, const char* format, ...); int vfprintf(FILE* stream, const char* format, va_list arg); int vfscanf(FILE* stream, const char* format, va_list arg); int vprintf(const char* format, va_list arg); int vscanf(const char* format, va_list arg); int vsnprintf(char* s, size_t n, const char* format, va_list arg); int vsprintf(char* s, const char* format, va_list arg); int vsscanf(const char* s, const char* format, va_list arg); int fgetc(FILE* stream); char* fgets(char* s, int n, FILE* stream); int fputc(int c, FILE* stream); int fputs(const char* s, FILE* stream); int getc(FILE* stream); int getchar(); int putc(int c, FILE* stream); int putchar(int c); int puts(const char* s); int ungetc(int c, FILE* stream);
size_t fread(void* ptr, size_t size, size_t nmemb, FILE* stream);
size_t fwrite(const void* ptr, size_t size, size_t nmemb, FILE* stream); int fgetpos(FILE* stream, fpos_t* pos); int fseek(FILE* stream, long int offset, int whence); int fsetpos(FILE* stream, const fpos_t* pos); long int ftell(FILE* stream); void rewind(FILE* stream); void clearerr(FILE* stream); int feof(FILE* stream); int ferror(FILE* stream); void perror(const char* s);}
[1](#1)
[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/iostreams.tex#L18970)
The contents and meaning of the header [<cstdio>](#header:%3ccstdio%3e "31.13.1 Header <cstdio> synopsis [cstdio.syn]") are the same as the C standard library header [<stdio.h>](support.c.headers.general#header:%3cstdio.h%3e "17.15.1 General [support.c.headers.general]")[.](#1.sentence-1)
[2](#2)
[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/iostreams.tex#L18974)
The return from each function call
that delivers data
to the host environment
to be written to a file (See also: ISO/IEC 9899:2024, 7.21.3)
is an observable checkpoint ([[intro.abstract]](intro.abstract "4.1.2 Abstract machine"))[.](#2.sentence-1)
[3](#3)
[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/iostreams.tex#L18981)
Calls to the function tmpnam with an argument that is a null pointer value may
introduce a data race ([[res.on.data.races]](res.on.data.races "16.4.6.10 Data race avoidance")) with other calls to tmpnam with
an argument that is a null pointer value[.](#3.sentence-1)
See also: ISO/IEC 9899:2024, 7.23