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Annotation of src/usr.bin/tmux/procname.c, Revision 1.6

1.6     ! guenther    1: /* $OpenBSD: procname.c,v 1.5 2009/08/09 15:17:50 nicm Exp $ */
1.1       nicm        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:
1.2       nicm       28: #ifndef nitems
1.1       nicm       29: #define nitems(_a) (sizeof((_a)) / sizeof((_a)[0]))
1.2       nicm       30: #endif
1.1       nicm       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:
1.6     ! guenther   37: struct kinfo_proc2     *cmp_procs(struct kinfo_proc2 *, struct kinfo_proc2 *);
1.4       nicm       38: char           *get_proc_name(int, char *);
                     39:
1.6     ! guenther   40: struct kinfo_proc2 *
        !            41: cmp_procs(struct kinfo_proc2 *p1, struct kinfo_proc2 *p2)
1.4       nicm       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: }
1.1       nicm       77:
                     78: char *
                     79: get_proc_name(int fd, char *tty)
                     80: {
1.6     ! guenther   81:        int              mib[6] = { CTL_KERN, KERN_PROC2, KERN_PROC_PGRP, 0,
        !            82:                                    sizeof(struct kinfo_proc2), 0 };
1.1       nicm       83:        struct stat      sb;
                     84:        size_t           len;
1.6     ! guenther   85:        struct kinfo_proc2 *buf, *newbuf, *bestp;
1.1       nicm       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:
1.4       nicm      101:        if ((newbuf = realloc(buf, len)) == NULL)
                    102:                goto error;
1.1       nicm      103:        buf = newbuf;
                    104:
1.6     ! guenther  105:        mib[5] = (int)(len / sizeof(struct kinfo_proc2));
1.1       nicm      106:        if (sysctl(mib, nitems(mib), buf, &len, NULL, 0) == -1) {
                    107:                if (errno == ENOMEM)
                    108:                        goto retry;
1.4       nicm      109:                goto error;
1.1       nicm      110:        }
                    111:
                    112:        bestp = NULL;
1.6     ! guenther  113:        for (i = 0; i < len / sizeof (struct kinfo_proc2); i++) {
        !           114:                if ((dev_t)buf[i].p_tdev != sb.st_rdev)
1.1       nicm      115:                        continue;
1.4       nicm      116:                if (bestp == NULL)
1.6     ! guenther  117:                        bestp = &buf[i];
1.4       nicm      118:                else
1.6     ! guenther  119:                        bestp = cmp_procs(&buf[i], bestp);
1.1       nicm      120:        }
                    121:
                    122:        name = NULL;
                    123:        if (bestp != NULL)
                    124:                name = strdup(bestp->p_comm);
                    125:
                    126:        free(buf);
                    127:        return (name);
1.4       nicm      128:
                    129: error:
                    130:        free(buf);
                    131:        return (NULL);
1.1       nicm      132: }