See also

- https://sicstus.sics.se/sicstus/docs/3.12.11/html/sicstus/System-Utilities.html

To be done

- This library is incomplete. As of SICStus 3.12.11, the following predicates are missing:

• delete_file/2
• directory_files/2
• file_exists/2
• file_property/2
• host_id/1
• kill/2

 environ(?Name, ?Value) is nondet

True if Value is an atom associated with the environment variable or system property Name.

Compatibility

- sicstus

To be done

- Mode -Name is not supported.

Because SWI-Prolog doesn't have an obvious equivalent to
SICStus system properties, this predicate currently
behaves as if no system properties are defined,
i. e. only environment variables are returned.

 exec(+Command, +Streams, -PID)

SICStus 3 compatible implementation of exec/3 on top of the SICStus 4 compatible process_create/3.

bug

- The SICStus version for Windows seems to hand Command directly to CreateProcess(). We hand it to

%COMSPEC% /s /c "Command"

In case of conflict, it is adviced to use process_create/3

 wait(+PID, -Status)

Wait for processes created using exec/3.

See also

- exec/3

 pid(-PID)

Process ID of the current process.

Compatibility

- sicstus.

 now(-When) is det

Unify when with the current time-stamp

Compatibility

- sicstus

 datime(+When, -Datime) is det

datime(-When, +Datime) is det

True when Datime is a datime/6 record that reflects the time stamp When.

Compatibility

- sicstus

 datime(-Datime) is det

Unifies Datime with the current date and time as a datime/6 record of the form datime(Year,Month,Day,Hour,Min,Sec). All fields are integers.

Compatibility

- sicstus

 system

 system(+Command)

 system(+Command, -Status)

Synomyms for shell/0, shell/1 and shell/2.

Compatibility

- sicstus.

 popen(+Command, +Mode, ?Stream)

Compatibility

- sicstus

 host_name(-HostName)

See also

- gethostname/1

Compatibility

- sicstus

 mktemp(+Template, -File) is det

Interface to the Unix function. This emulation uses tmp_file/2 and ignores Template.

deprecated

- This interface is a security-risc. Use tmp_file_stream/3.

Compatibility

- sicstus

 tmpnam(-FileName)

Interface to tmpnam(). This emulation uses tmp_file/2.

deprecated

- This interface is a security-risc. Use tmp_file_stream/3.

Compatibility

- sicstus

 file_exists(+FileName) is semidet

True if a file named FileName exists.

Compatibility

- sicstus

Re-exported predicates

The following predicates are exported from this file while their implementation is defined in imported modules or non-module files loaded by this module.

 shell

Execute an interactive shell. The following options are tried to find a suitable shell command:

1. The Prolog flag shell
2. The environment variable $SHELL
3. The Prolog flag posix_shell
4. The environment variable %comspec% (Windows only)

Errors

- existence_error(config, shell) if no suitable shell can be found.

Undocumented predicates

The following predicates are exported, but not or incorrectly documented.

 sleep(Arg1)

 rename_file(Arg1, Arg2)

 make_directory(Arg1)

 shell(Arg1, Arg2)

 shell(Arg1)

 working_directory(Arg1, Arg2)

 delete_file(Arg1)