1 /* $OpenBSD: setproctitle.c,v 1.12 2011/05/30 18:48:33 martynas Exp $ */ 2 /* 3 * Copyright (c) 1994, 1995 Christopher G. Demetriou 4 * All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 3. All advertising materials mentioning features or use of this software 15 * must display the following acknowledgement: 16 * This product includes software developed by Christopher G. Demetriou 17 * for the NetBSD Project. 18 * 4. The name of the author may not be used to endorse or promote products 19 * derived from this software without specific prior written permission 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 22 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 23 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 24 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 25 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 26 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 27 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 28 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 29 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 30 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 31 */ 32 33 #include <sys/param.h> 34 #include <sys/types.h> 35 #include <sys/exec.h> 36 #include <sys/sysctl.h> 37 38 #include <stdio.h> 39 #include <stdlib.h> 40 #include <string.h> 41 #include <stdarg.h> 42 43 #define MAX_PROCTITLE 2048 44 45 extern char *__progname; /* Program name, from crt0. */ 46 47 /* PRINTFLIKE1 */ 48 void 49 setproctitle(const char *fmt, ...) 50 { 51 static struct ps_strings *ps; 52 va_list ap; 53 54 static char buf[MAX_PROCTITLE], *bufp = buf; 55 int used; 56 57 va_start(ap, fmt); 58 if (fmt != NULL) { 59 used = snprintf(buf, MAX_PROCTITLE, "%s: ", __progname); 60 if (used >= MAX_PROCTITLE) 61 used = MAX_PROCTITLE - 1; 62 else if (used < 0) 63 used = 0; 64 (void)vsnprintf(buf + used, MAX_PROCTITLE - used, fmt, ap); 65 } else 66 (void)snprintf(buf, MAX_PROCTITLE, "%s", __progname); 67 va_end(ap); 68 69 if (ps == NULL) { 70 struct _ps_strings _ps; 71 int mib[2]; 72 size_t len; 73 74 mib[0] = CTL_VM; 75 mib[1] = VM_PSSTRINGS; 76 len = sizeof(_ps); 77 if (sysctl(mib, 2, &_ps, &len, NULL, 0) != 0) 78 return; 79 ps = (struct ps_strings *)_ps.val; 80 } 81 ps->ps_nargvstr = 1; 82 ps->ps_argvstr = &bufp; 83 } 84