diff options
| -rw-r--r-- | shell/ash.c | 116 |
1 files changed, 78 insertions, 38 deletions
diff --git a/shell/ash.c b/shell/ash.c index 9bb1d42..a8383d8 100644 --- a/shell/ash.c +++ b/shell/ash.c @@ -30,7 +30,7 @@ */ /* - * The follow should be set to reflect the type of system you have: + * The following should be set to reflect the type of system you have: * JOBS -> 1 if you have Berkeley job control, 0 otherwise. * define SYSV if you are running under System V. * define DEBUG=1 to compile in debugging ('set -o debug' to turn on) @@ -40,6 +40,11 @@ * a quit signal will generate a core dump. */ #define DEBUG 0 +/* Tweak debug output verbosity here */ +#define DEBUG_TIME 0 +#define DEBUG_PID 1 +#define DEBUG_SIG 1 + #define PROFILE 0 #define IFS_BROKEN @@ -47,9 +52,9 @@ #define JOBS ENABLE_ASH_JOB_CONTROL #if DEBUG -#ifndef _GNU_SOURCE -#define _GNU_SOURCE -#endif +# ifndef _GNU_SOURCE +# define _GNU_SOURCE +# endif #endif #include "busybox.h" /* for applet_names */ @@ -71,11 +76,11 @@ #endif #ifndef PIPE_BUF -#define PIPE_BUF 4096 /* amount of buffering in a pipe */ +# define PIPE_BUF 4096 /* amount of buffering in a pipe */ #endif #if defined(__uClinux__) -#error "Do not even bother, ash will not run on NOMMU machine" +# error "Do not even bother, ash will not run on NOMMU machine" #endif @@ -86,14 +91,6 @@ #define CMDTABLESIZE 31 /* should be prime */ -/* ============ Misc helpers */ - -#define xbarrier() do { __asm__ __volatile__ ("": : :"memory"); } while (0) - -/* C99 says: "char" declaration may be signed or unsigned by default */ -#define signed_char2int(sc) ((int)((signed char)sc)) - - /* ============ Shell options */ static const char *const optletters_optnames[] = { @@ -257,7 +254,24 @@ extern struct globals_misc *const ash_ptr_to_globals_misc; } while (0) +/* ============ DEBUG */ +#if DEBUG +static void trace_printf(const char *fmt, ...); +static void trace_vprintf(const char *fmt, va_list va); +# define TRACE(param) trace_printf param +# define TRACEV(param) trace_vprintf param +#else +# define TRACE(param) +# define TRACEV(param) +#endif + + /* ============ Utility functions */ +#define xbarrier() do { __asm__ __volatile__ ("": : :"memory"); } while (0) + +/* C99 say: "char" declaration may be signed or unsigned by default */ +#define signed_char2int(sc) ((int)(signed char)(sc)) + static int isdigit_str9(const char *str) { int maxlen = 9 + 1; /* max 9 digits: 999999999 */ @@ -296,6 +310,12 @@ raise_exception(int e) exception_type = e; longjmp(exception_handler->loc, 1); } +#if DEBUG +#define raise_exception(e) do { \ + TRACE(("raising exception %d on line %d\n", (e), __LINE__)); \ + raise_exception(e); \ +} while (0) +#endif /* * Called from trap.c when a SIGINT is received. (If the user specifies @@ -328,6 +348,12 @@ raise_interrupt(void) raise_exception(ex_type); /* NOTREACHED */ } +#if DEBUG +#define raise_interrupt() do { \ + TRACE(("raising interrupt on line %d\n", __LINE__)); \ + raise_interrupt(); \ +} while (0) +#endif #if ENABLE_ASH_OPTIMIZE_FOR_SIZE static void @@ -346,7 +372,9 @@ force_int_on(void) raise_interrupt(); } #define FORCE_INT_ON force_int_on() -#else + +#else /* !ASH_OPTIMIZE_FOR_SIZE */ + #define INT_ON do { \ xbarrier(); \ if (--suppressint == 0 && intpending) \ @@ -358,7 +386,7 @@ force_int_on(void) if (intpending) \ raise_interrupt(); \ } while (0) -#endif /* ASH_OPTIMIZE_FOR_SIZE */ +#endif /* !ASH_OPTIMIZE_FOR_SIZE */ #define SAVE_INT(v) ((v) = suppressint) @@ -666,6 +694,12 @@ trace_printf(const char *fmt, ...) if (debug != 1) return; + if (DEBUG_TIME) + fprintf(tracefile, "%u ", (int) time(NULL)); + if (DEBUG_PID) + fprintf(tracefile, "[%u] ", (int) getpid()); + if (DEBUG_SIG) + fprintf(tracefile, "pending s:%d i:%d(supp:%d) ", pendingsig, intpending, suppressint); va_start(va, fmt); vfprintf(tracefile, fmt, va); va_end(va); @@ -676,6 +710,12 @@ trace_vprintf(const char *fmt, va_list va) { if (debug != 1) return; + if (DEBUG_TIME) + fprintf(tracefile, "%u ", (int) time(NULL)); + if (DEBUG_PID) + fprintf(tracefile, "[%u] ", (int) getpid()); + if (DEBUG_SIG) + fprintf(tracefile, "pending s:%d i:%d(supp:%d) ", pendingsig, intpending, suppressint); vfprintf(tracefile, fmt, va); } @@ -980,14 +1020,6 @@ showtree(union node *n) shtree(n, 1, NULL, stdout); } -#define TRACE(param) trace_printf param -#define TRACEV(param) trace_vprintf param - -#else - -#define TRACE(param) -#define TRACEV(param) - #endif /* DEBUG */ @@ -7951,6 +7983,7 @@ dotrap(void) pendingsig = 0; xbarrier(); + TRACE(("dotrap entered\n")); for (sig = 1, g = gotsig; sig < NSIG; sig++, g++) { int want_exexit; char *t; @@ -7962,15 +7995,20 @@ dotrap(void) * don't upset it by resetting gotsig[SIGINT-1] */ if (sig == SIGINT && !t) continue; + + TRACE(("sig %d is active, will run handler '%s'\n", sig, t)); *g = 0; if (!t) continue; want_exexit = evalstring(t, SKIPEVAL); exitstatus = savestatus; - if (want_exexit) + if (want_exexit) { + TRACE(("dotrap returns %d\n", skip)); return want_exexit; + } } + TRACE(("dotrap returns 0\n")); return 0; } @@ -7997,22 +8035,27 @@ evaltree(union node *n, int flags) int checkexit = 0; void (*evalfn)(union node *, int); int status; + int int_level; + + SAVE_INT(int_level); if (n == NULL) { TRACE(("evaltree(NULL) called\n")); goto out1; } - TRACE(("pid %d, evaltree(%p: %d, %d) called\n", - getpid(), n, n->type, flags)); + TRACE(("evaltree(%p: %d, %d) called\n", n, n->type, flags)); exception_handler = &jmploc; { int err = setjmp(jmploc.loc); if (err) { /* if it was a signal, check for trap handlers */ - if (exception_type == EXSIG) + if (exception_type == EXSIG) { + TRACE(("exception %d (EXSIG) in evaltree, err=%d\n", exception, err)); goto out; + } /* continue on the way out */ + TRACE(("exception %d in evaltree, propagating err=%d\n", exception, err)); exception_handler = savehandler; longjmp(exception_handler->loc, err); } @@ -8095,7 +8138,8 @@ evaltree(union node *n, int flags) if (exitstatus == 0) { n = n->nif.ifpart; goto evaln; - } else if (n->nif.elsepart) { + } + if (n->nif.elsepart) { n = n->nif.elsepart; goto evaln; } @@ -8121,6 +8165,9 @@ evaltree(union node *n, int flags) exexit: raise_exception(EXEXIT); } + + RESTORE_INT(int_level); + TRACE(("leaving evaltree (no interrupts)\n")); } #if !defined(__alpha__) || (defined(__GNUC__) && __GNUC__ >= 3) @@ -8998,6 +9045,7 @@ evalcommand(union node *cmd, int flags) if (forkshell(jp, cmd, FORK_FG) != 0) { exitstatus = waitforjob(jp); INT_ON; + TRACE(("forked child exited with %d\n", exitstatus)); break; } FORCE_INT_ON; @@ -13762,7 +13810,7 @@ int ash_main(int argc UNUSED_PARAM, char **argv) exception_handler = &jmploc; #if DEBUG opentrace(); - trace_puts("Shell args: "); + TRACE(("Shell args: ")); trace_puts_args(argv); #endif rootpid = getpid(); @@ -13847,14 +13895,6 @@ int ash_main(int argc UNUSED_PARAM, char **argv) /* NOTREACHED */ } -#if DEBUG -const char *applet_name = "debug stuff usage"; -int main(int argc, char **argv) -{ - return ash_main(argc, argv); -} -#endif - /*- * Copyright (c) 1989, 1991, 1993, 1994 |