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Full Discussion: Logging in shared file
Top Forums Programming Logging in shared file Post 302858009 by Don Cragun on Saturday 28th of September 2013 02:28:25 AM
Old 09-28-2013
Whether you use fprintf() or vfprintf() (or putc(), putchar(), printf(), dprintf(), etc.) doesn't matter. What matters is:
  1. using append mode in all of your fopen() calls and
  2. using unbuffered output, or writing complete lines in every output request and using line-buffered output.
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PUTC(3) 						     Library Functions Manual							   PUTC(3)

NAME
putc, putchar, fputc, putw - put character or word on a stream SYNOPSIS
#include <stdio.h> int putc(int c, FILE *stream) int putchar(int c) int fputc(int c, FILE *stream) int putw(int w, FILE *stream) DESCRIPTION
Putc appends the character c to the named output stream. It returns the character written. Putchar(c) is defined as putc(c, stdout). Fputc behaves like putc, but is a genuine function rather than a macro. Putw appends word (that is, int) w to the output stream. It returns the word written. Putw neither assumes nor causes special alignment in the file. SEE ALSO
fopen(3), fclose(3), getc(3), puts(3), printf(3), fread(3). DIAGNOSTICS
These functions return the constant EOF upon error. Since this is a good integer, ferror(3) should be used to detect putw errors. BUGS
Because it is implemented as a macro, putc treats a stream argument with side effects improperly. In particular `putc(c, *f++);' doesn't work sensibly. Errors can occur long after the call to putc. 7th Edition November 6, 1985 PUTC(3)
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