musl/src/stdio/__stdio_seek.c

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2011-02-12 00:22:29 -05:00
#include "stdio_impl.h"
static off_t retneg1(FILE *f, off_t off, int whence)
{
return -1;
}
off_t __stdio_seek(FILE *f, off_t off, int whence)
{
off_t ret = __syscall_lseek(f->fd, off, whence);
/* Detect unseekable files and optimize future failures out */
if (ret < 0 && off == 0 && whence == SEEK_CUR)
f->seek = retneg1;
return ret;
}