/* * Copyright (c) 1997-2001 Erez Zadok * Copyright (c) 1990 Jan-Simon Pendry * Copyright (c) 1990 Imperial College of Science, Technology & Medicine * Copyright (c) 1990 The Regents of the University of California. * All rights reserved. * * This code is derived from software contributed to Berkeley by * Jan-Simon Pendry at Imperial College, London. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. All advertising materials mentioning features or use of this software * must display the following acknowledgment: * This product includes software developed by the University of * California, Berkeley and its contributors. * 4. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * * %W% (Berkeley) %G% * * $Id: xutil.c,v 1.11.2.6 2001/01/10 03:23:41 ezk Exp $ * */ #ifdef HAVE_CONFIG_H # include #endif /* HAVE_CONFIG_H */ #include #include /* * Logfp is the default logging device, and is initialized to stderr by * default in dplog/plog below, and in * amd/amfs_program.c:amfs_program_exec(). */ FILE *logfp = NULL; static char *am_progname = "unknown"; /* "amd" */ static char am_hostname[MAXHOSTNAMELEN + 1] = "unknown"; /* Hostname */ pid_t am_mypid = -1; /* process ID */ serv_state amd_state; /* amd's state */ int foreground = 1; /* 1 == this is the top-level server */ #ifdef DEBUG int debug_flags = 0; #endif /* DEBUG */ #ifdef HAVE_SYSLOG int syslogging; #endif /* HAVE_SYSLOG */ int xlog_level = XLOG_ALL & ~XLOG_MAP & ~XLOG_STATS; int xlog_level_init = ~0; static int amd_program_number = AMQ_PROGRAM; time_t clock_valid = 0; time_t xclock_valid = 0; #ifdef DEBUG_MEM static int mem_bytes; static int orig_mem_bytes; #endif /* DEBUG_MEM */ /* forward definitions */ static void real_plog(int lvl, const char *fmt, va_list vargs) __attribute__((__format__(__printf__, 2, 0))); /* for GCC format string auditing */ static const char *expand_error(const char *f, char *e, int maxlen) __attribute__((__format_arg__(1))); #ifdef DEBUG /* * List of debug options. */ struct opt_tab dbg_opt[] = { {"all", D_ALL}, /* All */ {"amq", D_AMQ}, /* Register for AMQ program */ {"daemon", D_DAEMON}, /* Enter daemon mode */ {"fork", D_FORK}, /* Fork server (nofork = don't fork) */ {"full", D_FULL}, /* Program trace */ #ifdef HAVE_CLOCK_GETTIME {"hrtime", D_HRTIME}, /* Print high resolution time stamps */ #endif /* HAVE_CLOCK_GETTIME */ /* info service specific debugging (hesiod, nis, etc) */ {"info", D_INFO}, # ifdef DEBUG_MEM {"mem", D_MEM}, /* Trace memory allocations */ # endif /* DEBUG_MEM */ {"mtab", D_MTAB}, /* Use local mtab file */ {"readdir", D_READDIR}, /* check on browsable_dirs progress */ {"str", D_STR}, /* Debug string munging */ {"test", D_TEST}, /* Full debug - but no daemon */ {"trace", D_TRACE}, /* Protocol trace */ {"xdrtrace", D_XDRTRACE}, /* Trace xdr routines */ {0, 0} }; #endif /* DEBUG */ /* * List of log options */ struct opt_tab xlog_opt[] = { {"all", XLOG_ALL}, /* All messages */ #ifdef DEBUG {"debug", XLOG_DEBUG}, /* Debug messages */ #endif /* DEBUG */ /* DEBUG */ {"error", XLOG_ERROR}, /* Non-fatal system errors */ {"fatal", XLOG_FATAL}, /* Fatal errors */ {"info", XLOG_INFO}, /* Information */ {"map", XLOG_MAP}, /* Map errors */ {"stats", XLOG_STATS}, /* Additional statistical information */ {"user", XLOG_USER}, /* Non-fatal user errors */ {"warn", XLOG_WARNING}, /* Warnings */ {"warning", XLOG_WARNING}, /* Warnings */ {0, 0} }; void am_set_progname(char *pn) { am_progname = pn; } const char * am_get_progname(void) { return am_progname; } void am_set_hostname(char *hn) { strncpy(am_hostname, hn, MAXHOSTNAMELEN); am_hostname[MAXHOSTNAMELEN] = '\0'; } const char * am_get_hostname(void) { return am_hostname; } pid_t am_set_mypid(void) { am_mypid = getpid(); return am_mypid; } voidp xmalloc(int len) { voidp p; int retries = 600; /* * Avoid malloc's which return NULL for malloc(0) */ if (len == 0) len = 1; do { p = (voidp) malloc((unsigned) len); if (p) { #if defined(DEBUG) && defined(DEBUG_MEM) amuDebug(D_MEM) plog(XLOG_DEBUG, "Allocated size %d; block %#x", len, p); #endif /* defined(DEBUG) && defined(DEBUG_MEM) */ return p; } if (retries > 0) { plog(XLOG_ERROR, "Retrying memory allocation"); sleep(1); } } while (--retries); plog(XLOG_FATAL, "Out of memory"); going_down(1); abort(); return 0; } /* like xmalloc, but zeros out the bytes */ voidp xzalloc(int len) { voidp p = xmalloc(len); if (p) memset(p, 0, len); return p; } voidp xrealloc(voidp ptr, int len) { #if defined(DEBUG) && defined(DEBUG_MEM) amuDebug(D_MEM) plog(XLOG_DEBUG, "Reallocated size %d; block %#x", len, ptr); #endif /* defined(DEBUG) && defined(DEBUG_MEM) */ if (len == 0) len = 1; if (ptr) ptr = (voidp) realloc(ptr, (unsigned) len); else ptr = (voidp) xmalloc((unsigned) len); if (!ptr) { plog(XLOG_FATAL, "Out of memory in realloc"); going_down(1); abort(); } return ptr; } #if defined(DEBUG) && defined(DEBUG_MEM) void dxfree(char *file, int line, voidp ptr) { amuDebug(D_MEM) plog(XLOG_DEBUG, "Free in %s:%d: block %#x", file, line, ptr); /* this is the only place that must NOT use XFREE()!!! */ free(ptr); ptr = NULL; /* paranoid */ } #endif /* defined(DEBUG) && defined(DEBUG_MEM) */ #ifdef DEBUG_MEM static void checkup_mem(void) { struct mallinfo mi = mallinfo(); u_long uordbytes = mi.uordblks * 4096; if (mem_bytes != uordbytes) { if (orig_mem_bytes == 0) mem_bytes = orig_mem_bytes = uordbytes; else { fprintf(logfp, "%s[%ld]: ", am_get_progname(), (long) am_mypid); if (mem_bytes < uordbytes) { fprintf(logfp, "ALLOC: %ld bytes", uordbytes - mem_bytes); } else { fprintf(logfp, "FREE: %ld bytes", mem_bytes - uordbytes); } mem_bytes = uordbytes; fprintf(logfp, ", making %d missing\n", mem_bytes - orig_mem_bytes); } } malloc_verify(); } #endif /* DEBUG_MEM */ /* * Take a log format string and expand occurrences of %m * with the current error code taken from errno. Make sure * 'e' never gets longer than maxlen characters. */ static const char * expand_error(const char *f, char *e, int maxlen) { #ifndef HAVE_STRERROR /* * XXX: we are assuming that if a system doesn't has strerror, * then it has sys_nerr. If this assumption turns out to be wrong on * some systems, we'll have to write a separate test to detect if * a system has sys_nerr. -Erez */ extern int sys_nerr; #endif /* not HAVE_STRERROR */ const char *p; char *q; int error = errno; int len = 0; for (p = f, q = e; (*q = *p) && len < maxlen; len++, q++, p++) { if (p[0] == '%' && p[1] == 'm') { const char *errstr; #ifdef HAVE_STRERROR if (error < 0) #else /* not HAVE_STRERROR */ if (error < 0 || error >= sys_nerr) #endif /* not HAVE_STRERROR */ errstr = NULL; else #ifdef HAVE_STRERROR errstr = strerror(error); #else /* not HAVE_STRERROR */ errstr = sys_errlist[error]; #endif /* not HAVE_STRERROR */ if (errstr) strcpy(q, errstr); else sprintf(q, "Error %d", error); len += strlen(q) - 1; q += strlen(q) - 1; p++; } } e[maxlen-1] = '\0'; /* null terminate, to be sure */ return e; } /* * Output the time of day and hostname to the logfile */ static void show_time_host_and_name(int lvl) { static time_t last_t = 0; static char *last_ctime = 0; time_t t; #ifdef HAVE_CLOCK_GETTIME struct timespec ts; #endif /* HAVE_CLOCK_GETTIME */ char nsecs[11] = ""; /* '.' + 9 digits + '\0' */ char *sev; #ifdef HAVE_CLOCK_GETTIME /* * Some systems (AIX 4.3) seem to implement clock_gettime() as stub * returning ENOSYS. */ if (clock_gettime(CLOCK_REALTIME, &ts) == 0) { t = ts.tv_sec; #ifdef DEBUG amuDebug(D_HRTIME) sprintf(nsecs, ".%09ld", ts.tv_nsec); #endif /* DEBUG */ } else #endif /* HAVE_CLOCK_GETTIME */ t = clocktime(); if (t != last_t) { last_ctime = ctime(&t); last_t = t; } switch (lvl) { case XLOG_FATAL: sev = "fatal:"; break; case XLOG_ERROR: sev = "error:"; break; case XLOG_USER: sev = "user: "; break; case XLOG_WARNING: sev = "warn: "; break; case XLOG_INFO: sev = "info: "; break; case XLOG_DEBUG: sev = "debug:"; break; case XLOG_MAP: sev = "map: "; break; case XLOG_STATS: sev = "stats:"; break; default: sev = "hmm: "; break; } fprintf(logfp, "%15.15s%s %s %s[%ld]/%s ", last_ctime + 4, nsecs, am_get_hostname(), am_get_progname(), (long) am_mypid, sev); } #ifdef DEBUG /* * Switch on/off debug options */ int debug_option(char *opt) { return cmdoption(opt, dbg_opt, &debug_flags); } void dplog(const char *fmt, ...) { va_list ap; if (!logfp) logfp = stderr; /* initialize before possible first use */ va_start(ap, fmt); real_plog(XLOG_DEBUG, fmt, ap); va_end(ap); } #endif /* DEBUG */ void plog(int lvl, const char *fmt, ...) { va_list ap; if (!logfp) logfp = stderr; /* initialize before possible first use */ va_start(ap, fmt); real_plog(lvl, fmt, ap); va_end(ap); } static void real_plog(int lvl, const char *fmt, va_list vargs) { char msg[1024]; char efmt[1024]; char *ptr = msg; static char last_msg[1024]; static int last_count = 0, last_lvl = 0; if (!(xlog_level & lvl)) return; #ifdef DEBUG_MEM checkup_mem(); #endif /* DEBUG_MEM */ #ifdef HAVE_VSNPRINTF /* * XXX: ptr is 1024 bytes long, but we may write to ptr[strlen(ptr) + 2] * (to add an '\n', see code below) so we have to limit the string copy * to 1023 (including the '\0'). */ vsnprintf(ptr, 1023, expand_error(fmt, efmt, 1024), vargs); msg[1022] = '\0'; /* null terminate, to be sure */ #else /* not HAVE_VSNPRINTF */ /* * XXX: ptr is 1024 bytes long. It is possible to write into it * more than 1024 bytes, if efmt is already large, and vargs expand * as well. This is not as safe as using vsnprintf(). */ vsprintf(ptr, expand_error(fmt, efmt, 1023), vargs); msg[1023] = '\0'; /* null terminate, to be sure */ #endif /* not HAVE_VSNPRINTF */ ptr += strlen(ptr); if (ptr[-1] == '\n') *--ptr = '\0'; #ifdef HAVE_SYSLOG if (syslogging) { switch (lvl) { /* from mike */ case XLOG_FATAL: lvl = LOG_CRIT; break; case XLOG_ERROR: lvl = LOG_ERR; break; case XLOG_USER: lvl = LOG_WARNING; break; case XLOG_WARNING: lvl = LOG_WARNING; break; case XLOG_INFO: lvl = LOG_INFO; break; case XLOG_DEBUG: lvl = LOG_DEBUG; break; case XLOG_MAP: lvl = LOG_DEBUG; break; case XLOG_STATS: lvl = LOG_INFO; break; default: lvl = LOG_ERR; break; } syslog(lvl, "%s", msg); return; } #endif /* HAVE_SYSLOG */ *ptr++ = '\n'; *ptr = '\0'; /* * mimic syslog behavior: only write repeated strings if they differ */ switch (last_count) { case 0: /* never printed at all */ last_count = 1; strncpy(last_msg, msg, 1024); last_lvl = lvl; show_time_host_and_name(lvl); /* mimic syslog header */ fwrite(msg, ptr - msg, 1, logfp); fflush(logfp); break; case 1: /* item printed once, if same, don't repeat */ if (STREQ(last_msg, msg)) { last_count++; } else { /* last msg printed once, new one differs */ /* last_count remains at 1 */ strncpy(last_msg, msg, 1024); last_lvl = lvl; show_time_host_and_name(lvl); /* mimic syslog header */ fwrite(msg, ptr - msg, 1, logfp); fflush(logfp); } break; case 100: /* * Don't allow repetitions longer than 100, so you can see when something * cycles like crazy. */ show_time_host_and_name(last_lvl); sprintf(last_msg, "last message repeated %d times\n", last_count); fwrite(last_msg, strlen(last_msg), 1, logfp); fflush(logfp); last_count = 0; /* start from scratch */ break; default: /* item repeated multiple times */ if (STREQ(last_msg, msg)) { last_count++; } else { /* last msg repeated+skipped, new one differs */ show_time_host_and_name(last_lvl); sprintf(last_msg, "last message repeated %d times\n", last_count); fwrite(last_msg, strlen(last_msg), 1, logfp); strncpy(last_msg, msg, 1024); last_count = 1; last_lvl = lvl; show_time_host_and_name(lvl); /* mimic syslog header */ fwrite(msg, ptr - msg, 1, logfp); fflush(logfp); } break; } } /* * Display current debug options */ void show_opts(int ch, struct opt_tab *opts) { int i; int s = '{'; fprintf(stderr, "\t[-%c {no}", ch); for (i = 0; opts[i].opt; i++) { fprintf(stderr, "%c%s", s, opts[i].opt); s = ','; } fputs("}]\n", stderr); } int cmdoption(char *s, struct opt_tab *optb, int *flags) { char *p = s; int errs = 0; while (p && *p) { int neg; char *opt; struct opt_tab *dp, *dpn = 0; s = p; p = strchr(p, ','); if (p) *p = '\0'; /* check for "no" prefix to options */ if (s[0] == 'n' && s[1] == 'o') { opt = s + 2; neg = 1; } else { opt = s; neg = 0; } /* * Scan the array of debug options to find the * corresponding flag value. If it is found * then set (or clear) the flag (depending on * whether the option was prefixed with "no"). */ for (dp = optb; dp->opt; dp++) { if (STREQ(opt, dp->opt)) break; if (opt != s && !dpn && STREQ(s, dp->opt)) dpn = dp; } if (dp->opt || dpn) { if (!dp->opt) { dp = dpn; neg = !neg; } if (neg) *flags &= ~dp->flag; else *flags |= dp->flag; } else { /* * This will log to stderr when parsing the command line * since any -l option will not yet have taken effect. */ plog(XLOG_USER, "option \"%s\" not recognized", s); errs++; } /* * Put the comma back */ if (p) *p++ = ','; } return errs; } /* * Switch on/off logging options */ int switch_option(char *opt) { int xl = xlog_level; int rc = cmdoption(opt, xlog_opt, &xl); if (rc) { rc = EINVAL; } else { /* * Keep track of initial log level, and * don't allow options to be turned off. */ if (xlog_level_init == ~0) xlog_level_init = xl; else xl |= xlog_level_init; xlog_level = xl; } return rc; } #ifdef LOG_DAEMON /* * get syslog facility to use. * logfile can be "syslog", "syslog:daemon", "syslog:local7", etc. */ static int get_syslog_facility(const char *logfile) { char *facstr; /* parse facility string */ facstr = strchr(logfile, ':'); if (!facstr) /* log file was "syslog" */ return LOG_DAEMON; facstr++; if (!facstr || facstr[0] == '\0') { /* log file was "syslog:" */ plog(XLOG_WARNING, "null syslog facility, using LOG_DAEMON"); return LOG_DAEMON; } #ifdef LOG_KERN if (STREQ(facstr, "kern")) return LOG_KERN; #endif /* not LOG_KERN */ #ifdef LOG_USER if (STREQ(facstr, "user")) return LOG_USER; #endif /* not LOG_USER */ #ifdef LOG_MAIL if (STREQ(facstr, "mail")) return LOG_MAIL; #endif /* not LOG_MAIL */ if (STREQ(facstr, "daemon")) return LOG_DAEMON; #ifdef LOG_AUTH if (STREQ(facstr, "auth")) return LOG_AUTH; #endif /* not LOG_AUTH */ #ifdef LOG_SYSLOG if (STREQ(facstr, "syslog")) return LOG_SYSLOG; #endif /* not LOG_SYSLOG */ #ifdef LOG_LPR if (STREQ(facstr, "lpr")) return LOG_LPR; #endif /* not LOG_LPR */ #ifdef LOG_NEWS if (STREQ(facstr, "news")) return LOG_NEWS; #endif /* not LOG_NEWS */ #ifdef LOG_UUCP if (STREQ(facstr, "uucp")) return LOG_UUCP; #endif /* not LOG_UUCP */ #ifdef LOG_CRON if (STREQ(facstr, "cron")) return LOG_CRON; #endif /* not LOG_CRON */ #ifdef LOG_LOCAL0 if (STREQ(facstr, "local0")) return LOG_LOCAL0; #endif /* not LOG_LOCAL0 */ #ifdef LOG_LOCAL1 if (STREQ(facstr, "local1")) return LOG_LOCAL1; #endif /* not LOG_LOCAL1 */ #ifdef LOG_LOCAL2 if (STREQ(facstr, "local2")) return LOG_LOCAL2; #endif /* not LOG_LOCAL2 */ #ifdef LOG_LOCAL3 if (STREQ(facstr, "local3")) return LOG_LOCAL3; #endif /* not LOG_LOCAL3 */ #ifdef LOG_LOCAL4 if (STREQ(facstr, "local4")) return LOG_LOCAL4; #endif /* not LOG_LOCAL4 */ #ifdef LOG_LOCAL5 if (STREQ(facstr, "local5")) return LOG_LOCAL5; #endif /* not LOG_LOCAL5 */ #ifdef LOG_LOCAL6 if (STREQ(facstr, "local6")) return LOG_LOCAL6; #endif /* not LOG_LOCAL6 */ #ifdef LOG_LOCAL7 if (STREQ(facstr, "local7")) return LOG_LOCAL7; #endif /* not LOG_LOCAL7 */ /* didn't match anything else */ plog(XLOG_WARNING, "unknown syslog facility \"%s\", using LOG_DAEMON", facstr); return LOG_DAEMON; } #endif /* not LOG_DAEMON */ /* * Change current logfile */ int switch_to_logfile(char *logfile, int old_umask) { FILE *new_logfp = stderr; if (logfile) { #ifdef HAVE_SYSLOG syslogging = 0; #endif /* HAVE_SYSLOG */ if (STREQ(logfile, "/dev/stderr")) new_logfp = stderr; else if (NSTREQ(logfile, "syslog", strlen("syslog"))) { #ifdef HAVE_SYSLOG syslogging = 1; new_logfp = stderr; openlog(am_get_progname(), LOG_PID # ifdef LOG_CONS | LOG_CONS # endif /* LOG_CONS */ # ifdef LOG_NOWAIT | LOG_NOWAIT # endif /* LOG_NOWAIT */ # ifdef LOG_DAEMON , get_syslog_facility(logfile) # endif /* LOG_DAEMON */ ); #else /* not HAVE_SYSLOG */ plog(XLOG_WARNING, "syslog option not supported, logging unchanged"); #endif /* not HAVE_SYSLOG */ } else { (void) umask(old_umask); new_logfp = fopen(logfile, "a"); umask(0); } } /* * If we couldn't open a new file, then continue using the old. */ if (!new_logfp && logfile) { plog(XLOG_USER, "%s: Can't open logfile: %m", logfile); return 1; } /* * Close the previous file */ if (logfp && logfp != stderr) (void) fclose(logfp); logfp = new_logfp; plog(XLOG_INFO, "switched to logfile \"%s\"", logfile); return 0; } void unregister_amq(void) { #ifdef DEBUG amuDebug(D_AMQ) #endif /* DEBUG */ /* find which instance of amd to unregister */ pmap_unset(get_amd_program_number(), AMQ_VERSION); } void going_down(int rc) { if (foreground) { if (amd_state != Start) { if (amd_state != Done) return; unregister_amq(); } } if (foreground) { plog(XLOG_INFO, "Finishing with status %d", rc); } else { #ifdef DEBUG dlog("background process exiting with status %d", rc); #endif /* DEBUG */ } exit(rc); } /* return the rpc program number under which amd was used */ int get_amd_program_number(void) { return amd_program_number; } /* set the rpc program number used for amd */ void set_amd_program_number(int program) { amd_program_number = program; } /* * Release the controlling tty of the process pid. * * Algorithm: try these in order, if available, until one of them * succeeds: setsid(), ioctl(fd, TIOCNOTTY, 0). * Do not use setpgid(): on some OSs it may release the controlling tty, * even if the man page does not mention it, but on other OSs it does not. * Also avoid setpgrp(): it works on some systems, and on others it is * identical to setpgid(). */ void amu_release_controlling_tty(void) { #ifdef TIOCNOTTY int fd; #endif /* TIOCNOTTY */ int tempfd; #ifdef HAVE_SETSID /* XXX: one day maybe use vhangup(2) */ if (setsid() < 0) { plog(XLOG_WARNING, "Could not release controlling tty using setsid(): %m"); } else { plog(XLOG_INFO, "released controlling tty using setsid()"); return; } #endif /* HAVE_SETSID */ /* * In daemon mode, leaving open file descriptors to terminals or pipes * can be a really bad idea. * Case in point: the redhat startup script calls us through their 'initlog' * program, which exits as soon as the original amd process exits. If, at some * point, a misbehaved library function decides to print something to the screen, * we get a SIGPIPE and die. * More precisely: NIS libc functions will attempt to print to stderr * "YPBINDPROC_DOMAIN: Domain not bound" if ypbind is running but can't find * a ypserver. * * So we close all of our "terminal" filedescriptors, i.e. 0, 1 and 2, then * reopen them as /dev/null. * * XXX We should also probably set the SIGPIPE handler to SIG_IGN. */ tempfd = open("/dev/null", O_RDWR); fflush(stdin); close(0); dup2(tempfd, 0); fflush(stdout); close(1); dup2(tempfd, 1); fflush(stderr); close(2); dup2(tempfd, 2); close(tempfd); #ifdef TIOCNOTTY fd = open("/dev/tty", O_RDWR); if (fd < 0) { /* not an error if already no controlling tty */ if (errno != ENXIO) plog(XLOG_WARNING, "Could not open controlling tty: %m"); } else { if (ioctl(fd, TIOCNOTTY, 0) < 0 && errno != ENOTTY) plog(XLOG_WARNING, "Could not disassociate tty (TIOCNOTTY): %m"); else plog(XLOG_INFO, "released controlling tty using ioctl(TIOCNOTTY)"); close(fd); } return; #endif /* not TIOCNOTTY */ plog(XLOG_ERROR, "unable to release controlling tty"); }