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/* Simple LD_PRELOAD library to force stdout/stderr into line-buffered mode.
* This file is released to the Public Domain. */
#define _GNU_SOURCE
#include <stdio.h>
#include <stdlib.h>
#include <dlfcn.h>
#define TARGET_MODE _IOLBF
static int (*libc_setvbuf)(FILE *stream, char *buf, int mode, size_t size);
static int in_stdiobufhack;
int setvbuf(FILE *stream, char *buf, int mode, size_t size)
{
if (in_stdiobufhack)
return 0;
in_stdiobufhack = 1;
if (!libc_setvbuf)
libc_setvbuf = dlsym(RTLD_NEXT, "setvbuf");
if (!libc_setvbuf) {
fprintf(stderr, "stdiobufhack: Did not find libc setvbuf()\n");
exit(1);
}
if (stream == stdout || stream == stderr)
mode = TARGET_MODE;
in_stdiobufhack = 0;
return libc_setvbuf(stream, buf, mode, size);
}
static void __attribute__((__constructor__)) stdiobufhack_ctor(void)
{
setvbuf(stdout, NULL, TARGET_MODE, 1024);
setvbuf(stderr, NULL, TARGET_MODE, 1024);
}
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