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https://github.com/sheumann/hush.git
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hush: simplify debugging prints a little bit
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parent
dd999a2241
commit
d01ff13454
123
shell/hush.c
123
shell/hush.c
@ -80,12 +80,37 @@
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#include "busybox.h"
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#include <glob.h> /* glob, of course */
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#include <getopt.h> /* should be pretty obvious */
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/* #include <dmalloc.h> */
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//#define DEBUG_SHELL
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/* If you comment out one of these below, it will be #defined later
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* to perform debug printfs to stderr: */
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#define debug_printf(...) do {} while (0)
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/* Finer-grained debug switch */
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//#define DEBUG_SHELL_JOBS
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//#define DEBUG_SHELL_EXECUTION
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#define debug_printf_jobs(...) do {} while (0)
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#define debug_printf_exec(...) do {} while (0)
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#ifndef debug_printf
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#define debug_printf(...) fprintf(stderr, __VA_ARGS__)
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/* broken, of course, but OK for testing */
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static const char *indenter(int i)
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{
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static const char blanks[] = " ";
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return &blanks[sizeof(blanks) - i - 1];
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}
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#endif
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#define final_printf debug_printf
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#ifndef debug_printf_jobs
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#define debug_printf_jobs(...) fprintf(stderr, __VA_ARGS__)
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#define DEBUG_SHELL_JOBS 1
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#endif
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#ifndef debug_printf_exec
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#define debug_printf_exec(...) fprintf(stderr, __VA_ARGS__)
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#endif
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#if !ENABLE_HUSH_INTERACTIVE
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#undef ENABLE_FEATURE_EDITING
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@ -298,32 +323,6 @@ struct built_in_command {
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int (*function) (char **argv); /* function ptr */
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};
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#ifdef DEBUG_SHELL
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#define debug_printf(...) fprintf(stderr, __VA_ARGS__)
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/* broken, of course, but OK for testing */
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static char *indenter(int i)
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{
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static char blanks[] = " ";
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return &blanks[sizeof(blanks) - i - 1];
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}
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#else
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#define debug_printf(...) do {} while (0)
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#endif
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#ifdef DEBUG_SHELL_JOBS
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#define debug_jobs_printf(...) fprintf(stderr, __VA_ARGS__)
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#else
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#define debug_jobs_printf(...) do {} while (0)
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#endif
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#ifdef DEBUG_SHELL_EXECUTION
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#define debug_exec_printf(...) fprintf(stderr, __VA_ARGS__)
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#else
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#define debug_exec_printf(...) do {} while (0)
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#endif
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#define final_printf debug_printf
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static void __syntax(int line)
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{
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bb_error_msg("syntax error hush.c:%d", line);
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@ -514,7 +513,7 @@ static sigjmp_buf nofork_jb;
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static void handler_ctrl_c(int sig)
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{
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debug_jobs_printf("got sig %d\n", sig);
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debug_printf_jobs("got sig %d\n", sig);
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// as usual we can have all kinds of nasty problems with leaked malloc data here
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siglongjmp(nofork_jb, 1);
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}
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@ -523,20 +522,20 @@ static void handler_ctrl_z(int sig)
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{
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pid_t pid;
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debug_jobs_printf("got tty sig %d\n", sig);
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debug_printf_jobs("got tty sig %d\n", sig);
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pid = fork();
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if (pid < 0) /* can't fork. Pretend there were no Ctrl-Z */
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return;
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debug_jobs_printf("bg'ing nofork\n");
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debug_printf_jobs("bg'ing nofork\n");
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nofork_save.saved = 0; /* flag the fact that Ctrl-Z was handled */
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nofork_pipe->running_progs = 1;
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nofork_pipe->stopped_progs = 0;
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if (!pid) { /* child */
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debug_jobs_printf("setting pgrp for child\n");
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debug_printf_jobs("setting pgrp for child\n");
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setpgrp();
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set_every_sighandler(SIG_DFL);
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raise(SIGTSTP); /* resend TSTP so that child will be stopped */
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debug_jobs_printf("returning to child\n");
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debug_printf_jobs("returning to child\n");
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/* return to nofork, it will eventually exit now,
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* not return back to shell */
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return;
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@ -766,9 +765,9 @@ static int builtin_fg_bg(char **argv)
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}
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/* Restart the processes in the job */
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debug_jobs_printf("reviving %d procs, pgrp %d\n", pi->num_progs, pi->pgrp);
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debug_printf_jobs("reviving %d procs, pgrp %d\n", pi->num_progs, pi->pgrp);
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for (i = 0; i < pi->num_progs; i++) {
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debug_jobs_printf("reviving pid %d\n", pi->progs[i].pid);
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debug_printf_jobs("reviving pid %d\n", pi->progs[i].pid);
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pi->progs[i].is_stopped = 0;
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}
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pi->stopped_progs = 0;
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@ -1333,7 +1332,7 @@ static void pseudo_exec(struct child_prog *child)
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#if ENABLE_HUSH_INTERACTIVE
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interactive_fd = 0; /* crucial!!!! */
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#endif
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debug_exec_printf("pseudo_exec: run_list_real\n");
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debug_printf_exec("pseudo_exec: run_list_real\n");
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rcode = run_list_real(child->group);
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/* OK to leak memory by not calling free_pipe_list,
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* since this process is about to exit */
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@ -1478,20 +1477,20 @@ static int checkjobs(struct pipe* fg_pipe)
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#ifdef DEBUG_SHELL_JOBS
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if (WIFSTOPPED(status))
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debug_jobs_printf("pid %d stopped by sig %d (exitcode %d)\n",
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debug_printf_jobs("pid %d stopped by sig %d (exitcode %d)\n",
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childpid, WSTOPSIG(status), WEXITSTATUS(status));
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if (WIFSIGNALED(status))
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debug_jobs_printf("pid %d killed by sig %d (exitcode %d)\n",
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debug_printf_jobs("pid %d killed by sig %d (exitcode %d)\n",
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childpid, WTERMSIG(status), WEXITSTATUS(status));
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if (WIFEXITED(status))
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debug_jobs_printf("pid %d exited, exitcode %d\n",
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debug_printf_jobs("pid %d exited, exitcode %d\n",
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childpid, WEXITSTATUS(status));
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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_jobs_printf("check pid %d\n", fg_pipe->progs[i].pid);
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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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/* printf("process %d exit %d\n", i, WEXITSTATUS(status)); */
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if (dead) {
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@ -1504,7 +1503,7 @@ 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_jobs_printf("fg_pipe: running_progs %d stopped_progs %d\n",
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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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/* All processes in fg pipe have exited/stopped */
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@ -1606,7 +1605,7 @@ static int run_single_fg_nofork(struct pipe *pi, const struct bb_applet *a,
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* Sighandler has longjmped us here */
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signal(SIGINT, SIG_IGN);
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signal(SIGTSTP, SIG_IGN);
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debug_jobs_printf("Exiting nofork early\n");
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debug_printf_jobs("Exiting nofork early\n");
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restore_nofork_data(&nofork_save);
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if (nofork_save.saved == 0) /* Ctrl-Z, not Ctrl-C */
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insert_bg_job(pi);
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@ -1648,7 +1647,7 @@ static int run_pipe_real(struct pipe *pi)
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int rcode;
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const int single_fg = (pi->num_progs == 1 && pi->followup != PIPE_BG);
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debug_exec_printf("run_pipe_real start:\n");
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debug_printf_exec("run_pipe_real start:\n");
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nextin = 0;
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#if ENABLE_HUSH_JOB
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@ -1667,10 +1666,10 @@ static int run_pipe_real(struct pipe *pi)
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setup_redirects(child, squirrel);
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/* XXX could we merge code with following builtin case,
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* by creating a pseudo builtin that calls run_list_real? */
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debug_exec_printf(": run_list_real\n");
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debug_printf_exec(": run_list_real\n");
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rcode = run_list_real(child->group);
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restore_redirects(squirrel);
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debug_exec_printf("run_pipe_real return %d\n", rcode);
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debug_printf_exec("run_pipe_real return %d\n", rcode);
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return rcode;
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}
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@ -1718,10 +1717,10 @@ static int run_pipe_real(struct pipe *pi)
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char *str;
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str = make_string(argv + i);
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debug_exec_printf(": parse_string_outer '%s'\n", str);
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debug_printf_exec(": parse_string_outer '%s'\n", str);
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parse_string_outer(str, FLAG_EXIT_FROM_LOOP | FLAG_REPARSING);
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free(str);
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debug_exec_printf("run_pipe_real return %d\n", last_return_code);
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debug_printf_exec("run_pipe_real return %d\n", last_return_code);
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return last_return_code;
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}
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for (x = bltins; x->cmd; x++) {
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@ -1738,10 +1737,10 @@ static int run_pipe_real(struct pipe *pi)
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* things seem to work with glibc. */
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// TODO: fflush(NULL)?
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setup_redirects(child, squirrel);
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debug_exec_printf(": builtin '%s' '%s'...\n", x->cmd, argv[i+1]);
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debug_printf_exec(": builtin '%s' '%s'...\n", x->cmd, argv[i+1]);
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rcode = x->function(argv + i);
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restore_redirects(squirrel);
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debug_exec_printf("run_pipe_real return %d\n", rcode);
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debug_printf_exec("run_pipe_real return %d\n", rcode);
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return rcode;
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}
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}
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@ -1750,10 +1749,10 @@ static int run_pipe_real(struct pipe *pi)
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const struct bb_applet *a = find_applet_by_name(argv[i]);
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if (a && a->nofork) {
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setup_redirects(child, squirrel);
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debug_exec_printf(": run_single_fg_nofork '%s' '%s'...\n", argv[i], argv[i+1]);
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debug_printf_exec(": run_single_fg_nofork '%s' '%s'...\n", argv[i], argv[i+1]);
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rcode = run_single_fg_nofork(pi, a, argv + i);
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restore_redirects(squirrel);
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debug_exec_printf("run_pipe_real return %d\n", rcode);
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debug_printf_exec("run_pipe_real return %d\n", rcode);
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return rcode;
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}
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}
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@ -1768,7 +1767,7 @@ static int run_pipe_real(struct pipe *pi)
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for (i = 0; i < pi->num_progs; i++) {
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child = &(pi->progs[i]);
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debug_exec_printf(": pipe member '%s' '%s'...\n", child->argv[0], child->argv[1]);
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debug_printf_exec(": pipe member '%s' '%s'...\n", child->argv[0], child->argv[1]);
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/* pipes are inserted between pairs of commands */
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if ((i + 1) < pi->num_progs) {
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@ -1849,7 +1848,7 @@ static int run_pipe_real(struct pipe *pi)
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but it doesn't matter */
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nextin = pipefds[0];
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}
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debug_exec_printf("run_pipe_real return -1\n");
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debug_printf_exec("run_pipe_real return -1\n");
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return -1;
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}
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@ -1866,7 +1865,7 @@ static int run_list_real(struct pipe *pi)
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int if_code = 0, next_if_code = 0; /* need double-buffer to handle elif */
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reserved_style rmode, skip_more_in_this_rmode = RES_XXXX;
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debug_exec_printf("run_list_real start:\n");
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debug_printf_exec("run_list_real start:\n");
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/* check syntax for "for" */
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for (rpipe = pi; rpipe; rpipe = rpipe->next) {
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@ -1874,14 +1873,14 @@ static int run_list_real(struct pipe *pi)
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&& (rpipe->next == NULL)
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) {
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syntax();
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debug_exec_printf("run_list_real return 1\n");
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debug_printf_exec("run_list_real return 1\n");
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return 1;
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}
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if ((rpipe->r_mode == RES_IN && rpipe->next->r_mode == RES_IN && rpipe->next->progs->argv != NULL)
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|| (rpipe->r_mode == RES_FOR && rpipe->next->r_mode != RES_IN)
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) {
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syntax();
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debug_exec_printf("run_list_real return 1\n");
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debug_printf_exec("run_list_real return 1\n");
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return 1;
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}
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}
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@ -1957,7 +1956,7 @@ static int run_list_real(struct pipe *pi)
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if (pi->num_progs == 0)
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continue;
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save_num_progs = pi->num_progs; /* save number of programs */
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debug_exec_printf(": run_pipe_real with %d members\n", pi->num_progs);
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debug_printf_exec(": run_pipe_real with %d members\n", pi->num_progs);
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rcode = run_pipe_real(pi);
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if (rcode != -1) {
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/* We only ran a builtin: rcode was set by the return value
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@ -1996,7 +1995,7 @@ static int run_list_real(struct pipe *pi)
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}
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checkjobs(NULL);
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}
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debug_exec_printf("run_list_real return %d\n", rcode);
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debug_printf_exec("run_list_real return %d\n", rcode);
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return rcode;
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}
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@ -2072,7 +2071,7 @@ static int run_list(struct pipe *pi)
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{
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int rcode = 0;
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if (fake_mode == 0) {
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debug_exec_printf("run_list: run_list_real with %d members\n", pi->num_progs);
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debug_printf_exec("run_list: run_list_real with %d members\n", pi->num_progs);
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rcode = run_list_real(pi);
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}
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/* free_pipe_list has the side effect of clearing memory
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@ -3132,7 +3131,7 @@ static int parse_stream_outer(struct in_str *inp, int flag)
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if (rcode != 1 && ctx.old_flag == 0) {
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done_word(&temp, &ctx);
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done_pipe(&ctx, PIPE_SEQ);
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debug_exec_printf("parse_stream_outer: run_list\n");
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debug_printf_exec("parse_stream_outer: run_list\n");
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run_list(ctx.list_head);
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} else {
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if (ctx.old_flag != 0) {
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