libmodbus/docs/modbus_strerror.md

modbus_strerror

Name

modbus_strerror - return the error message

Synopsis

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

if (modbus_connect(ctx) == -1) {
    fprintf(stderr, "Connection failed: %s\n", modbus_strerror(errno));
    abort();
}