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Article contents:[[tags: manual]] [[toc:]] == Module (chicken process-context posix) This module provides access to POSIX-specific procedures which deal with the current process context. * New in CHICKEN 5.4.0: Errors caused by underlying C calls that change errno will produce a condition object with an {{errno}} property, which can be accessed with {{(get-condition-property <the-condition-object> 'exn 'errno)}}. === Process filesystem context ==== change-directory* <procedure>(change-directory* FD)</procedure> <procedure>(set! (current-directory) FD)</procedure> Changes the current working directory to the one represented by the file-descriptor {{FD}}, which should be an exact integer. '''NOTE''': Windows does not allow {{{open}}} on directories, so while technically it is supported, in practice you cannot use this procedure on native Windows builds (on cygwin it works because cygwin emulates this). ==== set-root-directory! <procedure>(set-root-directory! STRING)</procedure> Sets the root directory for the current process to the path given in {{STRING}} (using the {{chroot}} function). If the current process has no root permissions, the operation will fail. '''NOTE''': On native Windows builds (all except cygwin), this procedure is unimplemented and will raise an error. === Retrieving user & group information ==== current-user-id <procedure>(current-user-id)</procedure> <setter>(set! (current-user-id) UID)</setter> Get or set the real user-id of the current process. The procedure corresponds to the getuid and setuid C functions. '''NOTE''': On native Windows builds (all except cygwin), this procedure is unimplemented and will raise an error. ==== current-user-name <procedure>(current-user-name)</procedure> Get the login name corresponding to the real user-id of the current process from the system password database. On Windows, there's no user-id and no distinction between real and effective user, but this procedure ''will'' return the username associated with the current process, so it is safe to use. ==== current-effective-user-id <procedure>(current-effective-user-id)</procedure> <setter>(set! (current-effective-user-id) UID)</setter> Get or set the effective user-id of the current process. '''NOTE''': On native Windows builds (all except cygwin), this procedure is unimplemented and will raise an error. ==== current-effective-user-name <procedure>(current-effective-user-name)</procedure> Get the login name corresponding to the effective user-id of the current process from the system password database. '''NOTE''': On native Windows builds (all except cygwin), this procedure is unimplemented and will raise an error. ==== current-group-id <procedure>(current-group-id)</procedure> <setter>(set! (current-group-id) GID)</setter> Get or set the real group-id of the current process. '''NOTE''': On native Windows builds (all except cygwin), this procedure is unimplemented and will raise an error. ==== current-effective-group-id <procedure>(current-effective-group-id)</procedure> <setter>(set! (current-effective-group-id) GID)</setter> Get or set the effective group-id of the current process. ID can be found, then {{#f}} is returned. '''NOTE''': On native Windows builds (all except cygwin), this procedure is unimplemented and will raise an error. === Process identity ==== current-process-id <procedure>(current-process-id)</procedure> Returns the process ID of the current process. ==== parent-process-id <procedure>(parent-process-id)</procedure> Returns the process ID of the parent of the current process. '''NOTE''': On native Windows builds (all except cygwin), this procedure is unimplemented and will raise an error. ==== process-group-id <procedure>(process-group-id PID)</procedure> <setter>(set! (process-group-id PID) PGID)</setter> Get or set the process group ID of the process specified by {{PID}}. '''NOTE''': On native Windows builds (all except cygwin), this procedure is unimplemented and will raise an error. ==== create-session <procedure>(create-session)</procedure> Creates a new session with the current process as group leader. Returns current process id on success. Equivalent to setsid(2). ==== user-information <procedure>(user-information USER [AS-VECTOR])</procedure> If {{USER}} specifes a valid username (as a string) or user ID, then the user database is consulted and a list of 7 values are returned: the user-name, the encrypted password, the user ID, the group ID, a user-specific string, the home directory and the default shell. When {{AS-VECTOR}} is {{#t}} a vector of 7 elements is returned instead of a list. If no user with this name or id then {{#f}} is returned. Note: on Android systems, the user-specific string is always {{""}}, since {{pw_gecos}} is not available in the C {{passwd}} struct on that platform. '''NOTE''': On native Windows builds (all except cygwin), this procedure is unimplemented and will raise an error. --- Previous: [[Module (chicken process-context)]] Next: [[Module (chicken random)]] Description of your changes:

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