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1 .\"-
2 .\" SPDX-License-Identifier: BSD-3-Clause
55 .Bl -tag -width Ds
57 Each active process in the system is uniquely identified by a non-negative
72 a non-negative integer called the process group ID.
146 may be modified through execution of a set-user-ID or set-group-ID file
151 is duplicated, so that the execution of a set-group-ID program
162 to the owner of the file if the file is set-user-ID, and the effective
165 is set to the group of the file if the file is set-group-ID.
166 The effective user ID of the process is then recorded as the saved set-user-ID,
167 and the effective group ID of the process is recorded as the saved set-group-ID.
171 In POSIX.1, the saved set-user-ID and saved set-group-ID are optional,
173 for the super-user.
174 .It Super-user
176 .Em super-user
197 These characters may be arbitrary eight-bit values,
217 .Dv NUL Ns -terminated
231 Otherwise, the search begins from the current working directory.
247 .Em dot-dot
250 dot-dot refers to its parent directory.
251 .It Root Directory and Current Working Directory
253 and a current working directory for the purpose of resolving path
286 The process's effective user ID is that of the super-user.
287 Note that even the super-user cannot execute a non-executable file.
330 .Bl -inset -compact
350 non-threaded processes,
359 .Pq usually -1
364 -1 and to take action accordingly.
376 .Bl -hang -width Ds
427 function was executed by a process that had no existing or unwaited-for
434 or by system-imposed memory management constraints.
445 A block device operation was attempted on a non-block device or file.
454 .It Er 18 EXDEV Em "Cross-device link" .
461 trying to read a write-only device such as a printer.
466 An attempt was made to open a directory with write mode specified.
512 .It Er 30 EROFS Em "Read-only file system" .
514 on a file system that was read-only at the time.
539 was attempted on a non-blocking object
542 An operation was attempted on a non-blocking object that already
544 .It Er 38 ENOTSOCK Em "Socket operation on non-socket" .
545 Self-explanatory.
692 A system-imposed limit on the number of simultaneous file
724 at run-time.
736 .It Er 94 ECAPMODE Em "Not permitted in capability mode" .
737 The system call or operation is not permitted for capability mode processes.
743 An integrity check such as a check-hash or a cross-correlation failed.
750 filesystem or an in-kernel GEOM subsystem when they detect inconsistencies.