source: trunk/sys/dietlibc/freopen.c @ 90

#include "dietstdio.h"
#include <unistd.h>
#include <fcntl.h>
#include <errno.h>

/* this is needed so the libpthread wrapper can initialize the mutex,
 * not to lock it */

FILE *freopen_unlocked(const char *path, const char *mode, FILE *stream) {
  if (stream) {
    int f=__stdio_parse_mode(mode);
    fflush_unlocked(stream);
    close(stream->fd);
    if ((stream->fd=open(path,f,0666))!=-1) {
      //struct stat st;
      //fstat(stream->fd,&st);
      stream->flags = 0;//=(S_ISFIFO(st.st_mode))?FDPIPE:0;
      switch (f&3) {
      case O_RDWR: stream->flags|=CANWRITE;
      case O_RDONLY: stream->flags|=CANREAD; break;
      case O_WRONLY: stream->flags|=CANWRITE;
      }
    }
  } else errno=EINVAL;
  return stream;
}

FILE *freopen(const char *path, const char *mode, FILE *stream) __attribute__((weak,alias("freopen_unlocked")));