Rich Felker
7765706c05
since there is no easy way to detect whether open honored or ignored the O_CLOEXEC flag, the optimal solution to providing a fallback is simply to make the fcntl syscall to set the close-on-exec flag immediately after open returns.
23 lines
489 B
C
23 lines
489 B
C
#include "stdio_impl.h"
|
|
#include <fcntl.h>
|
|
#include <string.h>
|
|
|
|
FILE *__fopen_rb_ca(const char *filename, FILE *f, unsigned char *buf, size_t len)
|
|
{
|
|
memset(f, 0, sizeof *f);
|
|
|
|
f->fd = sys_open(filename, O_RDONLY|O_CLOEXEC);
|
|
if (f->fd < 0) return 0;
|
|
__syscall(SYS_fcntl, f->fd, F_SETFD, FD_CLOEXEC);
|
|
|
|
f->flags = F_NOWR | F_PERM;
|
|
f->buf = buf + UNGET;
|
|
f->buf_size = len - UNGET;
|
|
f->read = __stdio_read;
|
|
f->seek = __stdio_seek;
|
|
f->close = __stdio_close;
|
|
f->lock = -1;
|
|
|
|
return f;
|
|
}
|