10-10-2003
cannot save file...
Hello! I have a problem:
I compile some function, which must save file:
=====================
// prog.cpp
void save_file(){
FILE *fs = fopen("file.txt", "w");
if(!fs) cerr<< "cannot save";
fprintf(fs, "This is a text file.");
fclose(fs)
}
=====================
If i compile it from command command line
...root]# g++ prog.cpp
...root]# ./a.out
It starts and saves file normally.
But if i run this function in a programm from as CGI
programm(in Apache) - it doesn't save file! Says "cannot save"...
Maybe it s a problem with permissions? I have neard, that
Apache executes everything in "cgi-bin" as a user "nobody" -
maybe this is a reason? If it is, how can I cnange the permissions
and to what? Is there a function in C++ for permissions changing?
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GETC(3) Library Functions Manual GETC(3)
NAME
getc, getchar, fgetc, getw - get character or word from stream
SYNOPSIS
#include <stdio.h>
int getc(FILE *stream)
int getchar(void)
int fgetc(FILE *stream)
int getw(FILE *stream)
DESCRIPTION
Getc returns the next character from the named input stream.
Getchar() is identical to getc(stdin).
Fgetc behaves like getc, but is a genuine function, not a macro; it may be used to save object text.
Getw returns the next int from the named input stream. It returns the constant EOF upon end of file or error, but since that is a good
integer value, feof and ferror(3) should be used to check the success of getw. Getw assumes no special alignment in the file.
SEE ALSO
clearerr(3), fopen(3), putc(3), gets(3), scanf(3), fread(3), ungetc(3).
DIAGNOSTICS
These functions return the integer constant EOF at end of file, upon read error, or if an attempt is made to read a file not opened by
fopen. The end-of-file condition is remembered, even on a terminal, and all subsequent attempts to read will return EOF until the condi-
tion is cleared with clearerr(3).
BUGS
Because it is implemented as a macro, getc treats a stream argument with side effects incorrectly. In particular, `getc(*f++);' doesn't
work sensibly.
7th Edition May 14, 1986 GETC(3)