- NAME
- Tcl_SetErrno, Tcl_GetErrno, Tcl_ErrnoId, Tcl_ErrnoMsg — manipulate errno to store and retrieve error codes
- SYNOPSIS
- #include <tcl.h>
- void
- Tcl_SetErrno(errorCode)
- int
- Tcl_GetErrno()
- const char *
- Tcl_ErrnoId()
- const char *
- Tcl_ErrnoMsg(errorCode)
- ARGUMENTS
- DESCRIPTION
- KEYWORDS
Tcl_SetErrno, Tcl_GetErrno, Tcl_ErrnoId, Tcl_ErrnoMsg — manipulate errno to store and retrieve error codes
#include <tcl.h>
void
Tcl_SetErrno(errorCode)
int
Tcl_GetErrno()
const char *
Tcl_ErrnoId()
const char *
Tcl_ErrnoMsg(errorCode)
- int errorCode (in)
-
A POSIX error code such as ENOENT.
Tcl_SetErrno and Tcl_GetErrno provide portable access
to the errno variable, which is used to record a POSIX error
code after system calls and other operations such as Tcl_Gets.
These procedures are necessary because global variable accesses cannot
be made across module boundaries on some platforms.
Tcl_SetErrno sets the errno variable to the value of the
errorCode argument
C procedures that wish to return error information to their callers
via errno should call Tcl_SetErrno rather than setting
errno directly.
Tcl_GetErrno returns the current value of errno.
Procedures wishing to access errno should call this procedure
instead of accessing errno directly.
Tcl_ErrnoId and Tcl_ErrnoMsg return string
representations of errno values. Tcl_ErrnoId
returns a machine-readable textual identifier such as
“EACCES”
that corresponds to the current value of errno.
Tcl_ErrnoMsg returns a human-readable string such as
“permission denied”
that corresponds to the value of its
errorCode argument. The errorCode argument is
typically the value returned by Tcl_GetErrno.
The strings returned by these functions are
statically allocated and the caller must not free or modify them.
errno, error code, global variables
Copyright © 1996 Sun Microsystems, Inc.