1 /* $OpenBSD: procname.c,v 1.7 2011/04/10 03:20:59 guenther Exp $ */ 2 3 /* 4 * Copyright (c) 2009 Nicholas Marriott <nicm@users.sourceforge.net> 5 * 6 * Permission to use, copy, modify, and distribute this software for any 7 * purpose with or without fee is hereby granted, provided that the above 8 * copyright notice and this permission notice appear in all copies. 9 * 10 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 11 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 12 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 13 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 14 * WHATSOEVER RESULTING FROM LOSS OF MIND, USE, DATA OR PROFITS, WHETHER 15 * IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING 16 * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 17 */ 18 19 #include <sys/param.h> 20 #include <sys/sysctl.h> 21 #include <sys/stat.h> 22 23 #include <errno.h> 24 #include <stdlib.h> 25 #include <string.h> 26 #include <unistd.h> 27 28 #ifndef nitems 29 #define nitems(_a) (sizeof((_a)) / sizeof((_a)[0])) 30 #endif 31 32 #define is_runnable(p) \ 33 ((p)->p_stat == SRUN || (p)->p_stat == SIDL || (p)->p_stat == SONPROC) 34 #define is_stopped(p) \ 35 ((p)->p_stat == SSTOP || (p)->p_stat == SZOMB || (p)->p_stat == SDEAD) 36 37 struct kinfo_proc *cmp_procs(struct kinfo_proc *, struct kinfo_proc *); 38 char *get_proc_name(int, char *); 39 40 struct kinfo_proc * 41 cmp_procs(struct kinfo_proc *p1, struct kinfo_proc *p2) 42 { 43 if (is_runnable(p1) && !is_runnable(p2)) 44 return (p1); 45 if (!is_runnable(p1) && is_runnable(p2)) 46 return (p2); 47 48 if (is_stopped(p1) && !is_stopped(p2)) 49 return (p1); 50 if (!is_stopped(p1) && is_stopped(p2)) 51 return (p2); 52 53 if (p1->p_estcpu > p2->p_estcpu) 54 return (p1); 55 if (p1->p_estcpu < p2->p_estcpu) 56 return (p2); 57 58 if (p1->p_slptime < p2->p_slptime) 59 return (p1); 60 if (p1->p_slptime > p2->p_slptime) 61 return (p2); 62 63 if ((p1->p_flag & P_SINTR) && !(p2->p_flag & P_SINTR)) 64 return (p1); 65 if (!(p1->p_flag & P_SINTR) && (p2->p_flag & P_SINTR)) 66 return (p2); 67 68 if (strcmp(p1->p_comm, p2->p_comm) < 0) 69 return (p1); 70 if (strcmp(p1->p_comm, p2->p_comm) > 0) 71 return (p2); 72 73 if (p1->p_pid > p2->p_pid) 74 return (p1); 75 return (p2); 76 } 77 78 char * 79 get_proc_name(int fd, char *tty) 80 { 81 int mib[6] = { CTL_KERN, KERN_PROC, KERN_PROC_PGRP, 0, 82 sizeof(struct kinfo_proc), 0 }; 83 struct stat sb; 84 size_t len; 85 struct kinfo_proc *buf, *newbuf, *bestp; 86 u_int i; 87 char *name; 88 89 buf = NULL; 90 91 if (stat(tty, &sb) == -1) 92 return (NULL); 93 if ((mib[3] = tcgetpgrp(fd)) == -1) 94 return (NULL); 95 96 retry: 97 if (sysctl(mib, nitems(mib), NULL, &len, NULL, 0) == -1) 98 return (NULL); 99 len = (len * 5) / 4; 100 101 if ((newbuf = realloc(buf, len)) == NULL) 102 goto error; 103 buf = newbuf; 104 105 mib[5] = (int)(len / sizeof(struct kinfo_proc)); 106 if (sysctl(mib, nitems(mib), buf, &len, NULL, 0) == -1) { 107 if (errno == ENOMEM) 108 goto retry; 109 goto error; 110 } 111 112 bestp = NULL; 113 for (i = 0; i < len / sizeof (struct kinfo_proc); i++) { 114 if ((dev_t)buf[i].p_tdev != sb.st_rdev) 115 continue; 116 if (bestp == NULL) 117 bestp = &buf[i]; 118 else 119 bestp = cmp_procs(&buf[i], bestp); 120 } 121 122 name = NULL; 123 if (bestp != NULL) 124 name = strdup(bestp->p_comm); 125 126 free(buf); 127 return (name); 128 129 error: 130 free(buf); 131 return (NULL); 132 } 133