1 #include "stdio_impl.h"
2 #include <fcntl.h>
3 #include <string.h>
4
__fopen_rb_ca(const char * filename,FILE * f,unsigned char * buf,size_t len)5 FILE *__fopen_rb_ca(const char *filename, FILE *f, unsigned char *buf, size_t len)
6 {
7 memset(f, 0, sizeof *f);
8
9 #ifdef __wasilibc_unmodified_upstream // WASI has no sys_open
10 f->fd = sys_open(filename, O_RDONLY|O_CLOEXEC);
11 #else
12 f->fd = open(filename, O_RDONLY|O_CLOEXEC);
13 #endif
14 if (f->fd < 0) return 0;
15 #ifdef __wasilibc_unmodified_upstream // WASI has no syscall
16 __syscall(SYS_fcntl, f->fd, F_SETFD, FD_CLOEXEC);
17 #else
18 fcntl(f->fd, F_SETFD, FD_CLOEXEC);
19 #endif
20
21 f->flags = F_NOWR | F_PERM;
22 f->buf = buf + UNGET;
23 f->buf_size = len - UNGET;
24 f->read = __stdio_read;
25 f->seek = __stdio_seek;
26 f->close = __stdio_close;
27 #if defined(__wasilibc_unmodified_upstream) || defined(_REENTRANT)
28 f->lock = -1;
29 #endif
30
31 return f;
32 }
33