/* Extended support for using signal values. Written by Fred Fish. fnf@cygnus.com This file is in the public domain. */ #include "ansidecl.h" #include "libiberty.h" #include "config.h" #ifdef LOSING_SYS_SIGLIST #define sys_siglist no_such_symbol #endif #include #include /* Routines imported from standard C runtime libraries. */ #ifdef __STDC__ #include extern void *malloc (size_t size); /* 4.10.3.3 */ extern void *memset (void *s, int c, size_t n); /* 4.11.6.1 */ #else /* !__STDC__ */ extern char *malloc (); /* Standard memory allocater */ extern char *memset (); #endif /* __STDC__ */ #ifdef LOSING_SYS_SIGLIST #undef sys_siglist #endif #ifndef NULL # ifdef __STDC__ # define NULL (void *) 0 # else # define NULL 0 # endif #endif #ifndef MAX # define MAX(a,b) ((a) > (b) ? (a) : (b)) #endif /* Translation table for signal values. Note that this table is generally only accessed when it is used at runtime to initialize signal name and message tables that are indexed by signal value. Not all of these signals will exist on all systems. This table is the only thing that should have to be updated as new signal numbers are introduced. It's sort of ugly, but at least its portable. */ struct signal_info { int value; /* The numeric value from */ const char *name; /* The equivalent symbolic value */ #ifdef NEED_sys_siglist const char *msg; /* Short message about this value */ #endif }; #ifdef NEED_sys_siglist # define ENTRY(value, name, msg) {value, name, msg} #else # define ENTRY(value, name, msg) {value, name} #endif static const struct signal_info signal_table[] = { #if defined (SIGHUP) ENTRY(SIGHUP, "SIGHUP", "Hangup"), #endif #if defined (SIGINT) ENTRY(SIGINT, "SIGINT", "Interrupt"), #endif #if defined (SIGQUIT) ENTRY(SIGQUIT, "SIGQUIT", "Quit"), #endif #if defined (SIGILL) ENTRY(SIGILL, "SIGILL", "Illegal instruction"), #endif #if defined (SIGTRAP) ENTRY(SIGTRAP, "SIGTRAP", "Trace/breakpoint trap"), #endif /* Put SIGIOT before SIGABRT, so that if SIGIOT==SIGABRT then SIGABRT overrides SIGIOT. SIGABRT is in ANSI and POSIX.1, and SIGIOT isn't. */ #if defined (SIGIOT) ENTRY(SIGIOT, "SIGIOT", "IOT trap"), #endif #if defined (SIGABRT) ENTRY(SIGABRT, "SIGABRT", "Aborted"), #endif #if defined (SIGEMT) ENTRY(SIGEMT, "SIGEMT", "Emulation trap"), #endif #if defined (SIGFPE) ENTRY(SIGFPE, "SIGFPE", "Arithmetic exception"), #endif #if defined (SIGKILL) ENTRY(SIGKILL, "SIGKILL", "Killed"), #endif #if defined (SIGBUS) ENTRY(SIGBUS, "SIGBUS", "Bus error"), #endif #if defined (SIGSEGV) ENTRY(SIGSEGV, "SIGSEGV", "Segmentation fault"), #endif #if defined (SIGSYS) ENTRY(SIGSYS, "SIGSYS", "Bad system call"), #endif #if defined (SIGPIPE) ENTRY(SIGPIPE, "SIGPIPE", "Broken pipe"), #endif #if defined (SIGALRM) ENTRY(SIGALRM, "SIGALRM", "Alarm clock"), #endif #if defined (SIGTERM) ENTRY(SIGTERM, "SIGTERM", "Terminated"), #endif #if defined (SIGUSR1) ENTRY(SIGUSR1, "SIGUSR1", "User defined signal 1"), #endif #if defined (SIGUSR2) ENTRY(SIGUSR2, "SIGUSR2", "User defined signal 2"), #endif /* Put SIGCLD before SIGCHLD, so that if SIGCLD==SIGCHLD then SIGCHLD overrides SIGCLD. SIGCHLD is in POXIX.1 */ #if defined (SIGCLD) ENTRY(SIGCLD, "SIGCLD", "Child status changed"), #endif #if defined (SIGCHLD) ENTRY(SIGCHLD, "SIGCHLD", "Child status changed"), #endif #if defined (SIGPWR) ENTRY(SIGPWR, "SIGPWR", "Power fail/restart"), #endif #if defined (SIGWINCH) ENTRY(SIGWINCH, "SIGWINCH", "Window size changed"), #endif #if defined (SIGURG) ENTRY(SIGURG, "SIGURG", "Urgent I/O condition"), #endif #if defined (SIGIO) /* "I/O pending" has also been suggested, but is misleading since the signal only happens when the process has asked for it, not everytime I/O is pending. */ ENTRY(SIGIO, "SIGIO", "I/O possible"), #endif #if defined (SIGPOLL) ENTRY(SIGPOLL, "SIGPOLL", "Pollable event occurred"), #endif #if defined (SIGSTOP) ENTRY(SIGSTOP, "SIGSTOP", "Stopped (signal)"), #endif #if defined (SIGTSTP) ENTRY(SIGTSTP, "SIGTSTP", "Stopped (user)"), #endif #if defined (SIGCONT) ENTRY(SIGCONT, "SIGCONT", "Continued"), #endif #if defined (SIGTTIN) ENTRY(SIGTTIN, "SIGTTIN", "Stopped (tty input)"), #endif #if defined (SIGTTOU) ENTRY(SIGTTOU, "SIGTTOU", "Stopped (tty output)"), #endif #if defined (SIGVTALRM) ENTRY(SIGVTALRM, "SIGVTALRM", "Virtual timer expired"), #endif #if defined (SIGPROF) ENTRY(SIGPROF, "SIGPROF", "Profiling timer expired"), #endif #if defined (SIGXCPU) ENTRY(SIGXCPU, "SIGXCPU", "CPU time limit exceeded"), #endif #if defined (SIGXFSZ) ENTRY(SIGXFSZ, "SIGXFSZ", "File size limit exceeded"), #endif #if defined (SIGWIND) ENTRY(SIGWIND, "SIGWIND", "SIGWIND"), #endif #if defined (SIGPHONE) ENTRY(SIGPHONE, "SIGPHONE", "SIGPHONE"), #endif #if defined (SIGLOST) ENTRY(SIGLOST, "SIGLOST", "Resource lost"), #endif #if defined (SIGWAITING) ENTRY(SIGWAITING, "SIGWAITING", "Process's LWPs are blocked"), #endif #if defined (SIGLWP) ENTRY(SIGLWP, "SIGLWP", "Signal LWP"), #endif #if defined (SIGDANGER) ENTRY(SIGDANGER, "SIGDANGER", "Swap space dangerously low"), #endif #if defined (SIGGRANT) ENTRY(SIGGRANT, "SIGGRANT", "Monitor mode granted"), #endif #if defined (SIGRETRACT) ENTRY(SIGRETRACT, "SIGRETRACT", "Need to relinguish monitor mode"), #endif #if defined (SIGMSG) ENTRY(SIGMSG, "SIGMSG", "Monitor mode data available"), #endif #if defined (SIGSOUND) ENTRY(SIGSOUND, "SIGSOUND", "Sound completed"), #endif #if defined (SIGSAK) ENTRY(SIGSAK, "SIGSAK", "Secure attention"), #endif ENTRY(0, NULL, NULL) }; /* Translation table allocated and initialized at runtime. Indexed by the signal value to find the equivalent symbolic value. */ static const char **signal_names; static int num_signal_names = 0; /* Translation table allocated and initialized at runtime, if it does not already exist in the host environment. Indexed by the signal value to find the descriptive string. We don't export it for use in other modules because even though it has the same name, it differs from other implementations in that it is dynamically initialized rather than statically initialized. */ #ifdef NEED_sys_siglist static int sys_nsig; static const char **sys_siglist; #else static int sys_nsig = NSIG; extern const char * const sys_siglist[]; #endif /* NAME init_signal_tables -- initialize the name and message tables SYNOPSIS static void init_signal_tables (); DESCRIPTION Using the signal_table, which is initialized at compile time, generate the signal_names and the sys_siglist (if needed) tables, which are indexed at runtime by a specific signal value. BUGS The initialization of the tables may fail under low memory conditions, in which case we don't do anything particularly useful, but we don't bomb either. Who knows, it might succeed at a later point if we free some memory in the meantime. In any case, the other routines know how to deal with lack of a table after trying to initialize it. This may or may not be considered to be a bug, that we don't specifically warn about this particular failure mode. */ static void init_signal_tables () { const struct signal_info *eip; int nbytes; /* If we haven't already scanned the signal_table once to find the maximum signal value, then go find it now. */ if (num_signal_names == 0) { for (eip = signal_table; eip -> name != NULL; eip++) { if (eip -> value >= num_signal_names) { num_signal_names = eip -> value + 1; } } } /* Now attempt to allocate the signal_names table, zero it out, and then initialize it from the statically initialized signal_table. */ if (signal_names == NULL) { nbytes = num_signal_names * sizeof (char *); if ((signal_names = (const char **) malloc (nbytes)) != NULL) { memset (signal_names, 0, nbytes); for (eip = signal_table; eip -> name != NULL; eip++) { signal_names[eip -> value] = eip -> name; } } } #ifdef NEED_sys_siglist /* Now attempt to allocate the sys_siglist table, zero it out, and then initialize it from the statically initialized signal_table. */ if (sys_siglist == NULL) { nbytes = num_signal_names * sizeof (char *); if ((sys_siglist = (const char **) malloc (nbytes)) != NULL) { memset (sys_siglist, 0, nbytes); sys_nsig = num_signal_names; for (eip = signal_table; eip -> name != NULL; eip++) { sys_siglist[eip -> value] = eip -> msg; } } } #endif } /* NAME signo_max -- return the max signo value SYNOPSIS int signo_max (); DESCRIPTION Returns the maximum signo value for which a corresponding symbolic name or message is available. Note that in the case where we use the sys_siglist supplied by the system, it is possible for there to be more symbolic names than messages, or vice versa. In fact, the manual page for psignal(3b) explicitly warns that one should check the size of the table (NSIG) before indexing it, since new signal codes may be added to the system before they are added to the table. Thus NSIG might be smaller than value implied by the largest signo value defined in . We return the maximum value that can be used to obtain a meaningful symbolic name or message. */ int signo_max () { int maxsize; if (signal_names == NULL) { init_signal_tables (); } maxsize = MAX (sys_nsig, num_signal_names); return (maxsize - 1); } /* NAME strsignal -- map a signal number to a signal message string SYNOPSIS const char *strsignal (int signo) DESCRIPTION Maps an signal number to an signal message string, the contents of which are implementation defined. On systems which have the external variable sys_siglist, these strings will be the same as the ones used by psignal(). If the supplied signal number is within the valid range of indices for the sys_siglist, but no message is available for the particular signal number, then returns the string "Signal NUM", where NUM is the signal number. If the supplied signal number is not a valid index into sys_siglist, returns NULL. The returned string is only guaranteed to be valid only until the next call to strsignal. */ const char * strsignal (signo) int signo; { const char *msg; static char buf[32]; #ifdef NEED_sys_siglist if (signal_names == NULL) { init_signal_tables (); } #endif if ((signo < 0) || (signo >= sys_nsig)) { /* Out of range, just return NULL */ msg = NULL; } else if ((sys_siglist == NULL) || (sys_siglist[signo] == NULL)) { /* In range, but no sys_siglist or no entry at this index. */ sprintf (buf, "Signal %d", signo); msg = (const char *) buf; } else { /* In range, and a valid message. Just return the message. */ msg = (const char *) sys_siglist[signo]; } return (msg); } /* NAME strsigno -- map an signal number to a symbolic name string SYNOPSIS const char *strsigno (int signo) DESCRIPTION Given an signal number, returns a pointer to a string containing the symbolic name of that signal number, as found in . If the supplied signal number is within the valid range of indices for symbolic names, but no name is available for the particular signal number, then returns the string "Signal NUM", where NUM is the signal number. If the supplied signal number is not within the range of valid indices, then returns NULL. BUGS The contents of the location pointed to are only guaranteed to be valid until the next call to strsigno. */ const char * strsigno (signo) int signo; { const char *name; static char buf[32]; if (signal_names == NULL) { init_signal_tables (); } if ((signo < 0) || (signo >= num_signal_names)) { /* Out of range, just return NULL */ name = NULL; } else if ((signal_names == NULL) || (signal_names[signo] == NULL)) { /* In range, but no signal_names or no entry at this index. */ sprintf (buf, "Signal %d", signo); name = (const char *) buf; } else { /* In range, and a valid name. Just return the name. */ name = signal_names[signo]; } return (name); } /* NAME strtosigno -- map a symbolic signal name to a numeric value SYNOPSIS int strtosigno (char *name) DESCRIPTION Given the symbolic name of a signal, map it to a signal number. If no translation is found, returns 0. */ int strtosigno (name) const char *name; { int signo = 0; if (name != NULL) { if (signal_names == NULL) { init_signal_tables (); } for (signo = 0; signo < num_signal_names; signo++) { if ((signal_names[signo] != NULL) && (strcmp (name, signal_names[signo]) == 0)) { break; } } if (signo == num_signal_names) { signo = 0; } } return (signo); } /* NAME psignal -- print message about signal to stderr SYNOPSIS void psignal (unsigned signo, char *message); DESCRIPTION Print to the standard error the message, followed by a colon, followed by the description of the signal specified by signo, followed by a newline. */ #ifdef NEED_psignal void psignal (signo, message) unsigned signo; char *message; { if (signal_names == NULL) { init_signal_tables (); } if ((signo <= 0) || (signo >= sys_nsig)) { fprintf (stderr, "%s: unknown signal\n", message); } else { fprintf (stderr, "%s: %s\n", message, sys_siglist[signo]); } } #endif /* NEED_psignal */ /* A simple little main that does nothing but print all the signal translations if MAIN is defined and this file is compiled and linked. */ #ifdef MAIN #include int main () { int signo; int maxsigno; const char *name; const char *msg; maxsigno = signo_max (); printf ("%d entries in names table.\n", num_signal_names); printf ("%d entries in messages table.\n", sys_nsig); printf ("%d is max useful index.\n", maxsigno); /* Keep printing values until we get to the end of *both* tables, not *either* table. Note that knowing the maximum useful index does *not* relieve us of the responsibility of testing the return pointer for NULL. */ for (signo = 0; signo <= maxsigno; signo++) { name = strsigno (signo); name = (name == NULL) ? "" : name; msg = strsignal (signo); msg = (msg == NULL) ? "" : msg; printf ("%-4d%-18s%s\n", signo, name, msg); } return 0; } #endif