1 #include "stdio_impl.h"
2 #include <stdlib.h>
3 #include <sys/ioctl.h>
4 #include <fcntl.h>
5 #include <errno.h>
6 #include <string.h>
7 #include <pthread.h>
8
__fdopen(int fd,const char * mode)9 FILE *__fdopen(int fd, const char *mode)
10 {
11 FILE *f;
12 struct winsize wsz;
13 pthread_mutex_t filelockinit = PTHREAD_RECURSIVE_MUTEX_INITIALIZER_NP;
14
15 /* Check for valid initial mode character */
16 if (!strchr("rwa", *mode)) {
17 errno = EINVAL;
18 return 0;
19 }
20
21 /* Allocate FILE+buffer or fail */
22 if (!(f=malloc(sizeof *f + UNGET + BUFSIZ + sizeof(pthread_mutex_t)))) return 0;
23
24 /* Zero-fill only the struct, not the buffer */
25 memset(f, 0, sizeof *f);
26
27 /* Impose mode restrictions */
28 if (!strchr(mode, '+')) f->flags = (*mode == 'r') ? F_NOWR : F_NORD;
29
30 /* Set append mode on fd if opened for append */
31 if (*mode == 'a') {
32 int flags = fcntl(fd, F_GETFL);
33 if (!(flags & O_APPEND))
34 fcntl(fd, F_SETFL, flags | O_APPEND);
35 f->flags |= F_APP;
36 }
37
38 f->fd = fd;
39 f->buf = (unsigned char *)f + sizeof *f + UNGET;
40 f->buf_size = BUFSIZ;
41 f->lock = (pthread_mutex_t *)((unsigned char *)f + sizeof *f + UNGET + BUFSIZ);
42 memcpy(f->lock, &filelockinit, sizeof(pthread_mutex_t));
43
44 /* Activate line buffered mode for terminals */
45 f->lbf = EOF;
46 if (!(f->flags & F_NOWR))
47 f->lbf = '\n';
48
49 /* Initialize op ptrs. No problem if some are unneeded. */
50 f->read = __stdio_read;
51 f->write = __stdio_write;
52 f->seek = __stdio_seek;
53 f->close = __stdio_close;
54
55 /* Add new FILE to open file list */
56 return __ofl_add(f);
57 }
58
59 weak_alias(__fdopen, fdopen);
60