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/* $OpenBSD: procname.c,v 1.16 2016/10/10 21:29:23 nicm Exp $ */ |
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/* |
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* Copyright (c) 2009 Nicholas Marriott <nicholas.marriott@gmail.com> |
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* |
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* Permission to use, copy, modify, and distribute this software for any |
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* purpose with or without fee is hereby granted, provided that the above |
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* copyright notice and this permission notice appear in all copies. |
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* |
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES |
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF |
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR |
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES |
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* WHATSOEVER RESULTING FROM LOSS OF MIND, USE, DATA OR PROFITS, WHETHER |
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* IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING |
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* OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. |
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*/ |
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#include <sys/param.h> /* MAXCOMLEN */ |
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#include <sys/types.h> |
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#include <sys/proc.h> |
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#include <sys/sysctl.h> |
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#include <sys/stat.h> |
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#include <errno.h> |
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#include <stdlib.h> |
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#include <string.h> |
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#include <unistd.h> |
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#ifndef nitems |
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#define nitems(_a) (sizeof((_a)) / sizeof((_a)[0])) |
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#endif |
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#define is_runnable(p) \ |
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((p)->p_stat == SRUN || (p)->p_stat == SIDL || (p)->p_stat == SONPROC) |
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#define is_stopped(p) \ |
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((p)->p_stat == SSTOP || (p)->p_stat == SDEAD) |
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static struct kinfo_proc *cmp_procs(struct kinfo_proc *, struct kinfo_proc *); |
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char *get_proc_name(int, char *); |
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static struct kinfo_proc * |
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cmp_procs(struct kinfo_proc *p1, struct kinfo_proc *p2) |
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{ |
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if (is_runnable(p1) && !is_runnable(p2)) |
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return (p1); |
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if (!is_runnable(p1) && is_runnable(p2)) |
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return (p2); |
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if (is_stopped(p1) && !is_stopped(p2)) |
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return (p1); |
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if (!is_stopped(p1) && is_stopped(p2)) |
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return (p2); |
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if (p1->p_estcpu > p2->p_estcpu) |
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return (p1); |
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if (p1->p_estcpu < p2->p_estcpu) |
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return (p2); |
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if (p1->p_slptime < p2->p_slptime) |
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return (p1); |
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if (p1->p_slptime > p2->p_slptime) |
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return (p2); |
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if ((p1->p_flag & P_SINTR) && !(p2->p_flag & P_SINTR)) |
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return (p1); |
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if (!(p1->p_flag & P_SINTR) && (p2->p_flag & P_SINTR)) |
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return (p2); |
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if (strcmp(p1->p_comm, p2->p_comm) < 0) |
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return (p1); |
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if (strcmp(p1->p_comm, p2->p_comm) > 0) |
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return (p2); |
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if (p1->p_pid > p2->p_pid) |
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return (p1); |
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return (p2); |
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} |
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char * |
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get_proc_name(int fd, char *tty) |
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{ |
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int mib[6] = { CTL_KERN, KERN_PROC, KERN_PROC_PGRP, 0, |
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sizeof(struct kinfo_proc), 0 }; |
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struct stat sb; |
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size_t len; |
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struct kinfo_proc *buf, *newbuf, *bestp; |
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u_int i; |
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char *name; |
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buf = NULL; |
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if (stat(tty, &sb) == -1) |
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return (NULL); |
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if ((mib[3] = tcgetpgrp(fd)) == -1) |
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return (NULL); |
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retry: |
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if (sysctl(mib, nitems(mib), NULL, &len, NULL, 0) == -1) |
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goto error; |
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len = (len * 5) / 4; |
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if ((newbuf = realloc(buf, len)) == NULL) |
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goto error; |
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buf = newbuf; |
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mib[5] = (int)(len / sizeof(struct kinfo_proc)); |
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if (sysctl(mib, nitems(mib), buf, &len, NULL, 0) == -1) { |
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if (errno == ENOMEM) |
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goto retry; |
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goto error; |
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} |
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bestp = NULL; |
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for (i = 0; i < len / sizeof (struct kinfo_proc); i++) { |
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if ((dev_t)buf[i].p_tdev != sb.st_rdev) |
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continue; |
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if (bestp == NULL) |
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bestp = &buf[i]; |
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else |
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bestp = cmp_procs(&buf[i], bestp); |
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} |
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name = NULL; |
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if (bestp != NULL) |
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name = strdup(bestp->p_comm); |
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free(buf); |
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return (name); |
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error: |
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free(buf); |
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return (NULL); |
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} |