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/*
* fflush.c
*/
#include "stdioint.h"
int __fflush(struct _IO_file_pvt *f)
{
ssize_t rv;
char *p;
/*
* Flush any unused input data. If there is input data, there
* won't be any output data.
*/
if (__unlikely(f->ibytes))
return fseek(&f->pub, 0, SEEK_CUR);
p = f->buf;
while (f->obytes) {
rv = write(f->pub._IO_fileno, p, f->obytes);
if (rv == -1) {
if (errno == EINTR || errno == EAGAIN)
continue;
f->pub._IO_error = true;
return EOF;
} else if (rv == 0) {
/* EOF on output? */
f->pub._IO_eof = true;
return EOF;
}
p += rv;
f->obytes -= rv;
}
return 0;
}
int fflush(FILE *file)
{
struct _IO_file_pvt *f;
if (__likely(file)) {
f = stdio_pvt(file);
return __fflush(f);
} else {
int err = 0;
for (f = __stdio_headnode.next;
f != &__stdio_headnode;
f = f->next) {
if (f->obytes)
err |= __fflush(f);
}
return err;
}
}
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