diff options
Diffstat (limited to 'manual/job.texi')
| -rw-r--r-- | manual/job.texi | 50 |
1 files changed, 25 insertions, 25 deletions
diff --git a/manual/job.texi b/manual/job.texi index 1ac15ff..f97aceb 100644 --- a/manual/job.texi +++ b/manual/job.texi @@ -54,7 +54,7 @@ terminate all the processes in the foreground process group. @cindex session A @dfn{session} is a larger group of processes. Normally all the -proccesses that stem from a single login belong to the same session. +processes that stem from a single login belong to the same session. Every process belongs to a process group. When a process is created, it becomes a member of the same process group and session as its parent @@ -154,7 +154,7 @@ calls @code{setsid} to become the leader of a new session. @cindex controlling terminal, access to Processes in the foreground job of a controlling terminal have -unrestricted access to that terminal; background proesses do not. This +unrestricted access to that terminal; background processes do not. This section describes in more detail what happens when a process in a background job tries to access its controlling terminal. @@ -213,7 +213,7 @@ involved. @iftex @itemize @bullet -@item +@item @ref{Data Structures}, introduces the example and presents its primary data structures. @@ -310,7 +310,7 @@ job * find_job (pid_t pgid) @{ job *j; - + for (j = first_job; j; j = j->next) if (j->pgid == pgid) return j; @@ -324,7 +324,7 @@ int job_is_stopped (job *j) @{ process *p; - + for (p = j->first_process; p; p = p->next) if (!p->completed && !p->stopped) return 0; @@ -338,7 +338,7 @@ int job_is_completed (job *j) @{ process *p; - + for (p = j->first_process; p; p = p->next) if (!p->completed) return 0; @@ -355,7 +355,7 @@ job_is_completed (job *j) When a shell program that normally performs job control is started, it has to be careful in case it has been invoked from another shell that is -already doing its own job control. +already doing its own job control. A subshell that runs interactively has to ensure that it has been placed in the foreground by its parent shell before it can enable job control @@ -413,7 +413,7 @@ int shell_is_interactive; void init_shell () @{ - + /* @r{See if we are running interactively.} */ shell_terminal = STDIN_FILENO; shell_is_interactive = isatty (shell_terminal); @@ -512,7 +512,7 @@ send a @code{SIGTSTP} signal to the process group of the process, not just to the process itself. @xref{Signaling Another Process}. Finally, each child process should call @code{exec} in the normal way. -This is also the point at which redirection of the standard input and +This is also the point at which redirection of the standard input and output channels should be handled. @xref{Duplicating Descriptors}, for an explanation of how to do this. @@ -564,9 +564,9 @@ launch_process (process *p, pid_t pgid, @{ dup2 (errfile, STDERR_FILENO); close (errfile); - @} - - /* @r{Exec the new process. Make sure we exit.} */ + @} + + /* @r{Exec the new process. Make sure we exit.} */ execvp (p->argv[0], p->argv); perror ("execvp"); exit (1); @@ -590,7 +590,7 @@ launch_job (job *j, int foreground) process *p; pid_t pid; int mypipe[2], infile, outfile; - + infile = j->stdin; for (p = j->first_process; p; p = p->next) @{ @@ -638,7 +638,7 @@ launch_job (job *j, int foreground) close (outfile); infile = mypipe[0]; @} - + format_job_info (j, "launched"); if (!shell_is_interactive) @@ -704,13 +704,13 @@ put_job_in_foreground (job *j, int cont) perror ("kill (SIGCONT)"); @} @end group - + /* @r{Wait for it to report.} */ wait_for_job (j); - + /* @r{Put the shell back in the foreground.} */ tcsetpgrp (shell_terminal, shell_pgid); - + @group /* @r{Restore the shell's terminal modes.} */ tcgetattr (shell_terminal, &j->tmodes); @@ -722,7 +722,7 @@ put_job_in_foreground (job *j, int cont) @cindex background job, launching If the process group is launched as a background job, the shell should remain in the foreground itself and continue to read commands from -the terminal. +the terminal. In the sample shell, there is not much that needs to be done to put a job into the background. Here is the function it uses: @@ -833,7 +833,7 @@ update_status (void) @{ int status; pid_t pid; - + do pid = waitpid (WAIT_ANY, &status, WUNTRACED|WNOHANG); while (!mark_process_status (pid, status)); @@ -849,11 +849,11 @@ wait_for_job (job *j) @{ int status; pid_t pid; - + do pid = waitpid (WAIT_ANY, &status, WUNTRACED); - while (!mark_process_status (pid, status) - && !job_is_stopped (j) + while (!mark_process_status (pid, status) + && !job_is_stopped (j) && !job_is_completed (j)); @} @end group @@ -880,7 +880,7 @@ do_job_notification (void) /* @r{Update status information for child processes.} */ update_status (); - + jlast = NULL; for (j = first_job; j; j = jnext) @{ @@ -976,7 +976,7 @@ allocated and initialized. Most real shells provide a complex user interface that has support for a command language; variables; abbreviations, substitutions, and pattern matching on file names; and the like. All of this is far too complicated -to explain here! Instead, we have concentrated on showing how to +to explain here! Instead, we have concentrated on showing how to implement the core process creation and job control functions that can be called from such a shell. @@ -1058,7 +1058,7 @@ represents the size of a string large enough to hold the file name returned by @code{ctermid}. @end deftypevr -See also the @code{isatty} and @code{ttyname} functions, in +See also the @code{isatty} and @code{ttyname} functions, in @ref{Is It a Terminal}. |