835f9f950e
this header evolved to facilitate the extremely lazy practice of omitting explicit includes of the necessary headers in individual stdio source files; not only was this sloppy, but it also increased build time. now, stdio_impl.h is only including the headers it needs for its own use; any further headers needed by source files are included directly where needed.
50 lines
1.1 KiB
C
50 lines
1.1 KiB
C
#include "stdio_impl.h"
|
|
#include <sys/uio.h>
|
|
#include <pthread.h>
|
|
|
|
static void cleanup(void *p)
|
|
{
|
|
FILE *f = p;
|
|
if (!f->lockcount) __unlockfile(f);
|
|
}
|
|
|
|
size_t __stdio_write(FILE *f, const unsigned char *buf, size_t len)
|
|
{
|
|
struct iovec iovs[2] = {
|
|
{ .iov_base = f->wbase, .iov_len = f->wpos-f->wbase },
|
|
{ .iov_base = (void *)buf, .iov_len = len }
|
|
};
|
|
struct iovec *iov = iovs;
|
|
size_t rem = iov[0].iov_len + iov[1].iov_len;
|
|
int iovcnt = 2;
|
|
ssize_t cnt;
|
|
for (;;) {
|
|
if (libc.main_thread) {
|
|
pthread_cleanup_push(cleanup, f);
|
|
cnt = syscall_cp(SYS_writev, f->fd, iov, iovcnt);
|
|
pthread_cleanup_pop(0);
|
|
} else {
|
|
cnt = syscall(SYS_writev, f->fd, iov, iovcnt);
|
|
}
|
|
if (cnt == rem) {
|
|
f->wend = f->buf + f->buf_size;
|
|
f->wpos = f->wbase = f->buf;
|
|
return len;
|
|
}
|
|
if (cnt < 0) {
|
|
f->wpos = f->wbase = f->wend = 0;
|
|
f->flags |= F_ERR;
|
|
return iovcnt == 2 ? 0 : len-iov[0].iov_len;
|
|
}
|
|
rem -= cnt;
|
|
if (cnt > iov[0].iov_len) {
|
|
f->wpos = f->wbase = f->buf;
|
|
cnt -= iov[0].iov_len;
|
|
iov++; iovcnt--;
|
|
} else if (iovcnt == 2) {
|
|
f->wbase += cnt;
|
|
}
|
|
iov[0].iov_base = (char *)iov[0].iov_base + cnt;
|
|
iov[0].iov_len -= cnt;
|
|
}
|
|
}
|