1 /* $OpenBSD: procname.c,v 1.13 2014/07/04 05:58:31 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/proc.h> 21 #include <sys/sysctl.h> 22 #include <sys/stat.h> 23 24 #include <errno.h> 25 #include <stdlib.h> 26 #include <string.h> 27 #include <unistd.h> 28 29 #ifndef nitems 30 #define nitems(_a) (sizeof((_a)) / sizeof((_a)[0])) 31 #endif 32 33 #define is_runnable(p) \ 34 ((p)->p_stat == SRUN || (p)->p_stat == SIDL || (p)->p_stat == SONPROC) 35 #define is_stopped(p) \ 36 ((p)->p_stat == SSTOP || (p)->p_stat == SDEAD) 37 38 struct kinfo_proc *cmp_procs(struct kinfo_proc *, struct kinfo_proc *); 39 char *get_proc_name(int, char *); 40 41 struct kinfo_proc * 42 cmp_procs(struct kinfo_proc *p1, struct kinfo_proc *p2) 43 { 44 if (is_runnable(p1) && !is_runnable(p2)) 45 return (p1); 46 if (!is_runnable(p1) && is_runnable(p2)) 47 return (p2); 48 49 if (is_stopped(p1) && !is_stopped(p2)) 50 return (p1); 51 if (!is_stopped(p1) && is_stopped(p2)) 52 return (p2); 53 54 if (p1->p_estcpu > p2->p_estcpu) 55 return (p1); 56 if (p1->p_estcpu < p2->p_estcpu) 57 return (p2); 58 59 if (p1->p_slptime < p2->p_slptime) 60 return (p1); 61 if (p1->p_slptime > p2->p_slptime) 62 return (p2); 63 64 if ((p1->p_flag & P_SINTR) && !(p2->p_flag & P_SINTR)) 65 return (p1); 66 if (!(p1->p_flag & P_SINTR) && (p2->p_flag & P_SINTR)) 67 return (p2); 68 69 if (strcmp(p1->p_comm, p2->p_comm) < 0) 70 return (p1); 71 if (strcmp(p1->p_comm, p2->p_comm) > 0) 72 return (p2); 73 74 if (p1->p_pid > p2->p_pid) 75 return (p1); 76 return (p2); 77 } 78 79 char * 80 get_proc_name(int fd, char *tty) 81 { 82 int mib[6] = { CTL_KERN, KERN_PROC, KERN_PROC_PGRP, 0, 83 sizeof(struct kinfo_proc), 0 }; 84 struct stat sb; 85 size_t len; 86 struct kinfo_proc *buf, *newbuf, *bestp; 87 u_int i; 88 char *name; 89 90 buf = NULL; 91 92 if (stat(tty, &sb) == -1) 93 return (NULL); 94 if ((mib[3] = tcgetpgrp(fd)) == -1) 95 return (NULL); 96 97 retry: 98 if (sysctl(mib, nitems(mib), NULL, &len, NULL, 0) == -1) 99 goto error; 100 len = (len * 5) / 4; 101 102 if ((newbuf = realloc(buf, len)) == NULL) 103 goto error; 104 buf = newbuf; 105 106 mib[5] = (int)(len / sizeof(struct kinfo_proc)); 107 if (sysctl(mib, nitems(mib), buf, &len, NULL, 0) == -1) { 108 if (errno == ENOMEM) 109 goto retry; 110 goto error; 111 } 112 113 bestp = NULL; 114 for (i = 0; i < len / sizeof (struct kinfo_proc); i++) { 115 if ((dev_t)buf[i].p_tdev != sb.st_rdev) 116 continue; 117 if (bestp == NULL) 118 bestp = &buf[i]; 119 else 120 bestp = cmp_procs(&buf[i], bestp); 121 } 122 123 name = NULL; 124 if (bestp != NULL) 125 name = strdup(bestp->p_comm); 126 127 free(buf); 128 return (name); 129 130 error: 131 free(buf); 132 return (NULL); 133 } 134