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tmux 2.4

    1: /* $OpenBSD$ */
    2: 
    3: /*
    4:  * Copyright (c) 2009 Nicholas Marriott <nicholas.marriott@gmail.com>
    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/stat.h>
   22: #include <sys/sysctl.h>
   23: #include <sys/user.h>
   24: 
   25: #include <err.h>
   26: #include <errno.h>
   27: #include <event.h>
   28: #include <stdint.h>
   29: #include <stdlib.h>
   30: #include <string.h>
   31: #include <unistd.h>
   32: #include <libutil.h>
   33: 
   34: struct kinfo_proc	*cmp_procs(struct kinfo_proc *, struct kinfo_proc *);
   35: char			*osdep_get_name(int, char *);
   36: char			*osdep_get_cwd(int);
   37: struct event_base	*osdep_event_init(void);
   38: 
   39: #ifndef nitems
   40: #define nitems(_a) (sizeof((_a)) / sizeof((_a)[0]))
   41: #endif
   42: 
   43: #define is_runnable(p) \
   44: 	((p)->ki_stat == SRUN || (p)->ki_stat == SIDL)
   45: #define is_stopped(p) \
   46: 	((p)->ki_stat == SSTOP || (p)->ki_stat == SZOMB)
   47: 
   48: struct kinfo_proc *
   49: cmp_procs(struct kinfo_proc *p1, struct kinfo_proc *p2)
   50: {
   51: 	if (is_runnable(p1) && !is_runnable(p2))
   52: 		return (p1);
   53: 	if (!is_runnable(p1) && is_runnable(p2))
   54: 		return (p2);
   55: 
   56: 	if (is_stopped(p1) && !is_stopped(p2))
   57: 		return (p1);
   58: 	if (!is_stopped(p1) && is_stopped(p2))
   59: 		return (p2);
   60: 
   61: 	if (p1->ki_estcpu > p2->ki_estcpu)
   62: 		return (p1);
   63: 	if (p1->ki_estcpu < p2->ki_estcpu)
   64: 		return (p2);
   65: 
   66: 	if (p1->ki_slptime < p2->ki_slptime)
   67: 		return (p1);
   68: 	if (p1->ki_slptime > p2->ki_slptime)
   69: 		return (p2);
   70: 
   71: 	if (strcmp(p1->ki_comm, p2->ki_comm) < 0)
   72: 		return (p1);
   73: 	if (strcmp(p1->ki_comm, p2->ki_comm) > 0)
   74: 		return (p2);
   75: 
   76: 	if (p1->ki_pid > p2->ki_pid)
   77: 		return (p1);
   78: 	return (p2);
   79: }
   80: 
   81: char *
   82: osdep_get_name(int fd, char *tty)
   83: {
   84: 	int		 mib[4] = { CTL_KERN, KERN_PROC, KERN_PROC_PGRP, 0 };
   85: 	struct stat	 sb;
   86: 	size_t		 len;
   87: 	struct kinfo_proc *buf, *newbuf, *bestp;
   88: 	u_int		 i;
   89: 	char		*name;
   90: 
   91: 	buf = NULL;
   92: 
   93: 	if (stat(tty, &sb) == -1)
   94: 		return (NULL);
   95: 	if ((mib[3] = tcgetpgrp(fd)) == -1)
   96: 		return (NULL);
   97: 
   98: retry:
   99: 	if (sysctl(mib, nitems(mib), NULL, &len, NULL, 0) == -1)
  100: 		return (NULL);
  101: 	len = (len * 5) / 4;
  102: 
  103: 	if ((newbuf = realloc(buf, len)) == NULL)
  104: 		goto error;
  105: 	buf = newbuf;
  106: 
  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 (buf[i].ki_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->ki_comm);
  126: 
  127: 	free(buf);
  128: 	return (name);
  129: 
  130: error:
  131: 	free(buf);
  132: 	return (NULL);
  133: }
  134: 
  135: static char *
  136: osdep_get_cwd_fallback(int fd)
  137: {
  138: 	static char		 wd[PATH_MAX];
  139: 	struct kinfo_file	*info = NULL;
  140: 	pid_t			 pgrp;
  141: 	int			 nrecords, i;
  142: 
  143: 	if ((pgrp = tcgetpgrp(fd)) == -1)
  144: 		return (NULL);
  145: 
  146: 	if ((info = kinfo_getfile(pgrp, &nrecords)) == NULL)
  147: 		return (NULL);
  148: 
  149: 	for (i = 0; i < nrecords; i++) {
  150: 		if (info[i].kf_fd == KF_FD_TYPE_CWD) {
  151: 			strlcpy(wd, info[i].kf_path, sizeof wd);
  152: 			free(info);
  153: 			return (wd);
  154: 		}
  155: 	}
  156: 
  157: 	free(info);
  158: 	return (NULL);
  159: }
  160: 
  161: #ifdef KERN_PROC_CWD
  162: char *
  163: osdep_get_cwd(int fd)
  164: {
  165: 	static struct kinfo_file	info;
  166: 	static int			fallback;
  167: 	int	name[] = { CTL_KERN, KERN_PROC, KERN_PROC_CWD, 0 };
  168: 	size_t	len = sizeof info;
  169: 
  170: 	if (fallback)
  171: 		return (osdep_get_cwd_fallback(fd));
  172: 
  173: 	if ((name[3] = tcgetpgrp(fd)) == -1)
  174: 		return (NULL);
  175: 
  176: 	if (sysctl(name, 4, &info, &len, NULL, 0) == -1) {
  177: 		if (errno == ENOENT) {
  178: 			fallback = 1;
  179: 			return (osdep_get_cwd_fallback(fd));
  180: 		}
  181: 		return (NULL);
  182: 	}
  183: 	return (info.kf_path);
  184: }
  185: #else /* !KERN_PROC_CWD */
  186: char *
  187: osdep_get_cwd(int fd)
  188: {
  189: 	return (osdep_get_cwd_fallback(fd));
  190: }
  191: #endif /* KERN_PROC_CWD */
  192: 
  193: struct event_base *
  194: osdep_event_init(void)
  195: {
  196: 	/*
  197: 	 * On some versions of FreeBSD, kqueue doesn't work properly on tty
  198: 	 * file descriptors. This is fixed in recent FreeBSD versions.
  199: 	 */
  200: 	setenv("EVENT_NOKQUEUE", "1", 1);
  201: 	return (event_init());
  202: }