dprintf, vdprintf: tisk do deskriptoru souboru

Originální popis anglicky: dprintf, vdprintf - print to a file descriptor

Návod, kniha: Linux Programmer's Manual

STRUČNĚ

#define _GNU_SOURCE #include <stdio.h> int dprintf(int fd, const char *format, ...); int vdprintf(int fd, const char *format, va_list ap);

POPIS / INSTRUKCE

The functions dprintf and vdprintf (as found in the glibc2 library) are exact analogues of fprintf and vfprintf, except that they output to a file descriptor fd instead of to a given stream.

NOTES

These functions are GNU extensions, not in C or POSIX. Clearly, the names were badly chosen. Many systems (like MacOS) have incompatible functions called dprintf, usually some debugging version of printf, perhaps with a prototype like void dprintf (int level, const char *format, ...); where the first parameter is a debugging level (and output is to stderr). Moreover, dprintf (or DPRINTF) is also a popular macro name for a debugging printf. So, probably, it is better to avoid this function in programs intended to be portable. A better name would have been fdprintf.

SOUVISEJÍCÍ

printf(3)