mirror of
https://github.com/tmux/tmux.git
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174 lines
3.6 KiB
C
174 lines
3.6 KiB
C
/* $OpenBSD$ */
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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>
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#include <sys/proc.h>
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#include <sys/stat.h>
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#include <sys/sysctl.h>
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#include <errno.h>
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#include <event.h>
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#include <limits.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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#include "tmux.h"
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#define is_runnable(p) \
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((p)->p_stat == LSRUN || (p)->p_stat == SIDL)
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#define is_stopped(p) \
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((p)->p_stat == SSTOP || (p)->p_stat == SZOMB)
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struct kinfo_proc2 *cmp_procs(struct kinfo_proc2 *, struct kinfo_proc2 *);
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char *osdep_get_name(int, char *);
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char *osdep_get_cwd(int);
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struct event_base *osdep_event_init(void);
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struct kinfo_proc2 *
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cmp_procs(struct kinfo_proc2 *p1, struct kinfo_proc2 *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_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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osdep_get_name(int fd, __unused char *tty)
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{
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int mib[6];
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struct stat sb;
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size_t len, i;
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struct kinfo_proc2 *buf, *newbuf, *bestp;
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char *name;
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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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buf = NULL;
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len = sizeof bestp;
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mib[0] = CTL_KERN;
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mib[1] = KERN_PROC2;
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mib[2] = KERN_PROC_PGRP;
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mib[4] = sizeof *buf;
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retry:
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mib[5] = 0;
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if (sysctl(mib, __arraycount(mib), NULL, &len, NULL, 0) == -1)
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return (NULL);
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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] = len / (sizeof *buf);
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if (sysctl(mib, __arraycount(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 *buf); i++) {
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if (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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}
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char *
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osdep_get_cwd(int fd)
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{
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static char target[PATH_MAX + 1];
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pid_t pgrp;
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#ifdef KERN_PROC_CWD
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int mib[4];
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size_t len;
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#else
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char *path;
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ssize_t n;
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#endif
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if ((pgrp = tcgetpgrp(fd)) == -1)
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return (NULL);
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#ifdef KERN_PROC_CWD
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mib[0] = CTL_KERN;
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mib[1] = KERN_PROC_ARGS;
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mib[2] = pgrp;
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mib[3] = KERN_PROC_CWD;
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len = sizeof(target);
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if (sysctl(mib, __arraycount(mib), target, &len, NULL, 0) == 0)
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return (target);
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#else
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xasprintf(&path, "/proc/%lld/cwd", (long long) pgrp);
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n = readlink(path, target, sizeof(target) - 1);
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free(path);
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if (n > 0) {
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target[n] = '\0';
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return (target);
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}
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#endif
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return (NULL);
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}
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struct event_base *
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osdep_event_init(void)
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{
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return (event_init());
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}
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