diff options
Diffstat (limited to 'newlib/libc/reent/lseekr.c')
| -rw-r--r-- | newlib/libc/reent/lseekr.c | 63 |
1 files changed, 63 insertions, 0 deletions
diff --git a/newlib/libc/reent/lseekr.c b/newlib/libc/reent/lseekr.c new file mode 100644 index 00000000000..ed8ba13ede1 --- /dev/null +++ b/newlib/libc/reent/lseekr.c @@ -0,0 +1,63 @@ +/* Reentrant versions of lseek system call. */ + +#include <reent.h> +#include <unistd.h> +#include <_syslist.h> + +/* Some targets provides their own versions of this functions. Those + targets should define REENTRANT_SYSCALLS_PROVIDED in TARGET_CFLAGS. */ + +#ifdef _REENT_ONLY +#ifndef REENTRANT_SYSCALLS_PROVIDED +#define REENTRANT_SYSCALLS_PROVIDED +#endif +#endif + +#ifndef REENTRANT_SYSCALLS_PROVIDED + +/* We use the errno variable used by the system dependent layer. */ +#undef errno +extern int errno; + +/* +FUNCTION + <<_lseek_r>>---Reentrant version of lseek + +INDEX + _lseek_r + +ANSI_SYNOPSIS + #include <reent.h> + off_t _lseek_r(struct _reent *<[ptr]>, + int <[fd]>, off_t <[pos]>, int <[whence]>); + +TRAD_SYNOPSIS + #include <reent.h> + off_t _lseek_r(<[ptr]>, <[fd]>, <[pos]>, <[whence]>) + struct _reent *<[ptr]>; + int <[fd]>; + off_t <[pos]>; + int <[whence]>; + +DESCRIPTION + This is a reentrant version of <<lseek>>. It + takes a pointer to the global data block, which holds + <<errno>>. +*/ + +off_t +_lseek_r (ptr, fd, pos, whence) + struct _reent *ptr; + int fd; + off_t pos; + int whence; +{ + off_t ret; + + errno = 0; + if ((ret = _lseek (fd, pos, whence)) == (off_t) -1 && errno != 0) + ptr->_errno = errno; + return ret; +} + +#endif /* ! defined (REENTRANT_SYSCALLS_PROVIDED) */ |