Re: Out of ptys

Richard B. Johnson (root@chaos.analogic.com)
Wed, 26 Aug 1998 13:23:21 -0400 (EDT)

Alan,
This shows the problem I reported to the glibc folks about a year
go. Note that both functions, good() and bad(), are identical except
for the fds that I close.

#include <stdio.h>
#include <unistd.h>

void bad()
{
int i;
close(STDOUT_FILENO);
i = fprintf(stdout, "Hello world!\n");
if(i > 0)
fprintf(stderr, "Bad! %d bytes copied to (closed) stdout...\n", i);
else
fprintf(stderr, "Good! (%d)\n", i);
}

void good()
{
int i;
close(STDERR_FILENO);
i = fprintf(stderr, "Hello world!\n");
if(i > 0)
fprintf(stdout, "Bad! %d bytes copied to (closed) stderr...\n", i);
else
fprintf(stdout, "Good! (%d)\n", i);
}

int main(int argc, char *argv[])
{
int ch;

if(argc > 1)
{
ch = (int) *argv[1];
ch &=95;
switch(ch)
{
case 'G':
good();
break;
case 'B':
bad();
break;
default:
fprintf(stderr, "Huh (%c) ??\n", ch);
break;
}
}
else
fprintf(stderr, "Usage: %s [Good/Bad]\n", argv[0]);
return 0;
}

Cheers,
Dick Johnson
***** FILE SYSTEM WAS MODIFIED *****
Penguin : Linux version 2.1.115 on an i586 machine (66.15 BogoMips).
Warning : It's hard to remain at the trailing edge of technology.

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