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libc syscalls: ENOSYS implementations for open,fstat,close,lseek

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Closes #41
This commit is contained in:
Angus Gratton 2015-09-03 11:15:05 +10:00
parent 568ebc0fdc
commit 920ee8bf85
1 changed files with 13 additions and 14 deletions
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27
core/newlib_syscalls.c
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@ -65,20 +65,19 @@ long _read_r( struct _reent *r, int fd, char *ptr, int len )
return len; return len;
} }
/* These are stub implementations for the reentrant syscalls that /* Stub syscall implementations follow, to allow compiling newlib functions that
* newlib is configured to expect */ pull these in via various codepaths
int _fstat_r(struct _reent *r, int fd, void *buf) */
__attribute__((alias("syscall_returns_enosys"))) int _open_r(struct _reent *r, const char *pathname, int flags, int mode);
__attribute__((alias("syscall_returns_enosys"))) int _fstat_r(struct _reent *r, int fd, void *buf);
__attribute__((alias("syscall_returns_enosys"))) int _close_r(struct _reent *r, int fd);
__attribute__((alias("syscall_returns_enosys"))) off_t _lseek_r(struct _reent *r, int fd, off_t offset, int whence);
/* Generic stub for any newlib syscall that fails with errno ENOSYS
("Function not implemented") and a return value equivalent to
(int)-1. */
static int syscall_returns_enosys(struct _reent *r)
{ {
r->_errno=ENOSYS;
return -1; return -1;
} }
int _close_r(struct _reent *r, int fd)
{
return -1;
}
off_t _lseek_r(struct _reent *r, int fd, off_t offset, int whence)
{
return (off_t)-1;
}