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# modbus_strerror
## Name
modbus_strerror - return the error message
## Synopsis
```c
const char *modbus_strerror(int errnum);
```
## Description
The *modbus_strerror()* function shall return a pointer to an error message
string corresponding to the error number specified by the `errnum` argument. As
libmodbus defines additional error numbers over and above those defined by the
operating system, applications should use *modbus_strerror()* in preference to
the standard *strerror()* function.
## Return value
The *modbus_strerror()* function shall return a pointer to an error message
string.
## Errors
No errors are defined.
## Example
Display an error message when a Modbus connection cannot be established
```c
if (modbus_connect(ctx) == -1) {
fprintf(stderr, "Connection failed: %s\n", modbus_strerror(errno));
abort();
}
```
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