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https://github.com/sheumann/hush.git
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hush: kill some old unused fields; small code shrink
function old new delta builtin_exit 48 47 -1 checkjobs 351 335 -16 checkjobs_and_fg_shell 60 35 -25 ------------------------------------------------------------------------------ (add/remove: 0/0 grow/shrink: 0/3 up/down: 0/-42) Total: -42 bytes
This commit is contained in:
Denis Vlasenko
parent
cc3f20b9bd
commit
003f9fb213
73
shell/hush.c
73
shell/hush.c
@ -309,16 +309,14 @@ struct child_prog {
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struct pipe {
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struct pipe *next;
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int num_progs; /* total number of programs in job */
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int running_progs; /* number of programs running (not exited) */
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int alive_progs; /* number of programs running (not exited) */
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int stopped_progs; /* number of programs alive, but stopped */
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#if ENABLE_HUSH_JOB
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int jobid; /* job number */
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pid_t pgrp; /* process group ID for the job */
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char *cmdtext; /* name of job */
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#endif
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char *cmdbuf; /* buffer various argv's point into */
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struct child_prog *progs; /* array of commands in pipe */
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int job_context; /* bitmask defining current context */
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smallint pi_inverted; /* "! cmd | cmd" */
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smallint followup; /* PIPE_BG, PIPE_SEQ, PIPE_OR, PIPE_AND */
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smallint res_word; /* needed for if, for, while, until... */
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@ -1564,7 +1562,7 @@ static void remove_bg_job(struct pipe *pi)
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last_jobid = 0;
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}
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/* remove a backgrounded job */
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/* Remove a backgrounded job */
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static void delete_finished_bg_job(struct pipe *pi)
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{
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remove_bg_job(pi);
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@ -1574,23 +1572,21 @@ static void delete_finished_bg_job(struct pipe *pi)
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}
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#endif /* JOB */
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/* Checks to see if any processes have exited -- if they
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have, figure out why and see if a job has completed */
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/* Check to see if any processes have exited -- if they
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* have, figure out why and see if a job has completed */
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static int checkjobs(struct pipe* fg_pipe)
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{
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int attributes;
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int status;
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#if ENABLE_HUSH_JOB
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int prognum = 0;
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struct pipe *pi;
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#endif
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pid_t childpid;
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int rcode = 0;
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attributes = WUNTRACED;
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if (fg_pipe == NULL) {
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if (fg_pipe == NULL)
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attributes |= WNOHANG;
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}
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/* Do we do this right?
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* bash-3.00# sleep 20 | false
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@ -1607,8 +1603,8 @@ static int checkjobs(struct pipe* fg_pipe)
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wait_more:
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// TODO: safe_waitpid?
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while ((childpid = waitpid(-1, &status, attributes)) > 0) {
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int i;
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const int dead = WIFEXITED(status) || WIFSIGNALED(status);
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#if DEBUG_JOBS
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if (WIFSTOPPED(status))
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debug_printf_jobs("pid %d stopped by sig %d (exitcode %d)\n",
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@ -1622,14 +1618,14 @@ static int checkjobs(struct pipe* fg_pipe)
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#endif
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/* Were we asked to wait for fg pipe? */
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if (fg_pipe) {
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int i;
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for (i = 0; i < fg_pipe->num_progs; i++) {
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debug_printf_jobs("check pid %d\n", fg_pipe->progs[i].pid);
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if (fg_pipe->progs[i].pid == childpid) {
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if (fg_pipe->progs[i].pid != childpid)
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continue;
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/* printf("process %d exit %d\n", i, WEXITSTATUS(status)); */
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if (dead) {
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fg_pipe->progs[i].pid = 0;
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fg_pipe->running_progs--;
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fg_pipe->alive_progs--;
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if (i == fg_pipe->num_progs - 1) {
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/* last process gives overall exitstatus */
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rcode = WEXITSTATUS(status);
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@ -1640,58 +1636,52 @@ static int checkjobs(struct pipe* fg_pipe)
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fg_pipe->progs[i].is_stopped = 1;
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fg_pipe->stopped_progs++;
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}
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debug_printf_jobs("fg_pipe: running_progs %d stopped_progs %d\n",
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fg_pipe->running_progs, fg_pipe->stopped_progs);
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if (fg_pipe->running_progs - fg_pipe->stopped_progs <= 0) {
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debug_printf_jobs("fg_pipe: alive_progs %d stopped_progs %d\n",
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fg_pipe->alive_progs, fg_pipe->stopped_progs);
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if (fg_pipe->alive_progs - fg_pipe->stopped_progs <= 0) {
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/* All processes in fg pipe have exited/stopped */
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#if ENABLE_HUSH_JOB
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if (fg_pipe->running_progs)
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if (fg_pipe->alive_progs)
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insert_bg_job(fg_pipe);
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#endif
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return rcode;
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}
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/* There are still running processes in the fg pipe */
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goto wait_more;
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goto wait_more; /* do waitpid again */
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}
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}
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/* fall through to searching process in bg pipes */
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/* it wasnt fg_pipe, look for process in bg pipes */
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}
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#if ENABLE_HUSH_JOB
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/* We asked to wait for bg or orphaned children */
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/* No need to remember exitcode in this case */
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for (pi = job_list; pi; pi = pi->next) {
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prognum = 0;
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while (prognum < pi->num_progs) {
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if (pi->progs[prognum].pid == childpid)
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for (i = 0; i < pi->num_progs; i++) {
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if (pi->progs[i].pid == childpid)
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goto found_pi_and_prognum;
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prognum++;
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}
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}
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#endif
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/* Happens when shell is used as init process (init=/bin/sh) */
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debug_printf("checkjobs: pid %d was not in our list!\n", childpid);
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goto wait_more;
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continue; /* do waitpid again */
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#if ENABLE_HUSH_JOB
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found_pi_and_prognum:
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if (dead) {
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/* child exited */
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pi->progs[prognum].pid = 0;
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pi->running_progs--;
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if (!pi->running_progs) {
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pi->progs[i].pid = 0;
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pi->alive_progs--;
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if (!pi->alive_progs) {
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printf(JOB_STATUS_FORMAT, pi->jobid,
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"Done", pi->cmdtext);
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delete_finished_bg_job(pi);
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}
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} else {
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/* child stopped */
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pi->progs[i].is_stopped = 1;
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pi->stopped_progs++;
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pi->progs[prognum].is_stopped = 1;
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}
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#endif
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}
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} /* while (waitpid succeeds)... */
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/* wait found no children or failed */
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@ -1708,8 +1698,9 @@ static int checkjobs_and_fg_shell(struct pipe* fg_pipe)
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/* Job finished, move the shell to the foreground */
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p = getpgid(0); /* pgid of our process */
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debug_printf_jobs("fg'ing ourself: getpgid(0)=%d\n", (int)p);
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if (tcsetpgrp(interactive_fd, p) && errno != ENOTTY)
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bb_perror_msg("tcsetpgrp-4a");
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tcsetpgrp(interactive_fd, p);
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// if (tcsetpgrp(interactive_fd, p) && errno != ENOTTY)
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// bb_perror_msg("tcsetpgrp-4a");
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return rcode;
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}
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#endif
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@ -1751,7 +1742,7 @@ static int run_pipe(struct pipe *pi)
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#if ENABLE_HUSH_JOB
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pi->pgrp = -1;
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#endif
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pi->running_progs = 1;
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pi->alive_progs = 1;
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pi->stopped_progs = 0;
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/* Check if this is a simple builtin (not part of a pipe).
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@ -1841,7 +1832,7 @@ static int run_pipe(struct pipe *pi)
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set_jobctrl_sighandler(SIG_IGN);
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/* Going to fork a child per each pipe member */
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pi->running_progs = 0;
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pi->alive_progs = 0;
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nextin = 0;
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for (i = 0; i < pi->num_progs; i++) {
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@ -1905,7 +1896,7 @@ static int run_pipe(struct pipe *pi)
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/* Clearly indicate, was it fork or vfork */
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bb_perror_msg(BB_MMU ? "fork" : "vfork");
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} else {
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pi->running_progs++;
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pi->alive_progs++;
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#if ENABLE_HUSH_JOB
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/* Second and next children need to know pid of first one */
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if (pi->pgrp < 0)
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@ -1921,12 +1912,12 @@ static int run_pipe(struct pipe *pi)
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nextin = pipefds[0];
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}
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if (!pi->running_progs) {
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if (!pi->alive_progs) {
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debug_printf_exec("run_pipe return 1 (all forks failed, no children)\n");
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return 1;
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}
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debug_printf_exec("run_pipe return -1 (%u children started)\n", pi->running_progs);
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debug_printf_exec("run_pipe return -1 (%u children started)\n", pi->alive_progs);
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return -1;
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}
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@ -4205,7 +4196,7 @@ static int builtin_jobs(char **argv ATTRIBUTE_UNUSED)
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const char *status_string;
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for (job = job_list; job; job = job->next) {
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if (job->running_progs == job->stopped_progs)
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if (job->alive_progs == job->stopped_progs)
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status_string = "Stopped";
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else
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status_string = "Running";
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