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Annotation of src/usr.bin/tmux/procname.c, Revision 1.16

1.16    ! nicm        1: /* $OpenBSD: procname.c,v 1.15 2016/01/19 15:59:12 nicm Exp $ */
1.1       nicm        2:
                      3: /*
1.15      nicm        4:  * Copyright (c) 2009 Nicholas Marriott <nicholas.marriott@gmail.com>
1.1       nicm        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:
1.14      deraadt    19: #include <sys/param.h> /* MAXCOMLEN */
                     20: #include <sys/types.h>
1.10      millert    21: #include <sys/proc.h>
1.1       nicm       22: #include <sys/sysctl.h>
                     23: #include <sys/stat.h>
                     24:
                     25: #include <errno.h>
                     26: #include <stdlib.h>
                     27: #include <string.h>
                     28: #include <unistd.h>
                     29:
1.2       nicm       30: #ifndef nitems
1.1       nicm       31: #define nitems(_a) (sizeof((_a)) / sizeof((_a)[0]))
1.2       nicm       32: #endif
1.1       nicm       33:
                     34: #define is_runnable(p) \
                     35:        ((p)->p_stat == SRUN || (p)->p_stat == SIDL || (p)->p_stat == SONPROC)
                     36: #define is_stopped(p) \
1.13      guenther   37:        ((p)->p_stat == SSTOP || (p)->p_stat == SDEAD)
1.1       nicm       38:
1.16    ! nicm       39: static struct kinfo_proc *cmp_procs(struct kinfo_proc *, struct kinfo_proc *);
        !            40: char   *get_proc_name(int, char *);
1.4       nicm       41:
1.16    ! nicm       42: static struct kinfo_proc *
1.7       guenther   43: cmp_procs(struct kinfo_proc *p1, struct kinfo_proc *p2)
1.4       nicm       44: {
                     45:        if (is_runnable(p1) && !is_runnable(p2))
                     46:                return (p1);
                     47:        if (!is_runnable(p1) && is_runnable(p2))
                     48:                return (p2);
                     49:
                     50:        if (is_stopped(p1) && !is_stopped(p2))
                     51:                return (p1);
                     52:        if (!is_stopped(p1) && is_stopped(p2))
                     53:                return (p2);
                     54:
                     55:        if (p1->p_estcpu > p2->p_estcpu)
                     56:                return (p1);
                     57:        if (p1->p_estcpu < p2->p_estcpu)
                     58:                return (p2);
                     59:
                     60:        if (p1->p_slptime < p2->p_slptime)
                     61:                return (p1);
                     62:        if (p1->p_slptime > p2->p_slptime)
                     63:                return (p2);
                     64:
                     65:        if ((p1->p_flag & P_SINTR) && !(p2->p_flag & P_SINTR))
                     66:                return (p1);
                     67:        if (!(p1->p_flag & P_SINTR) && (p2->p_flag & P_SINTR))
                     68:                return (p2);
                     69:
                     70:        if (strcmp(p1->p_comm, p2->p_comm) < 0)
                     71:                return (p1);
                     72:        if (strcmp(p1->p_comm, p2->p_comm) > 0)
                     73:                return (p2);
                     74:
                     75:        if (p1->p_pid > p2->p_pid)
                     76:                return (p1);
                     77:        return (p2);
                     78: }
1.1       nicm       79:
                     80: char *
                     81: get_proc_name(int fd, char *tty)
                     82: {
1.7       guenther   83:        int              mib[6] = { CTL_KERN, KERN_PROC, KERN_PROC_PGRP, 0,
                     84:                                    sizeof(struct kinfo_proc), 0 };
1.1       nicm       85:        struct stat      sb;
                     86:        size_t           len;
1.7       guenther   87:        struct kinfo_proc *buf, *newbuf, *bestp;
1.1       nicm       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)
1.12      nicm      100:                goto error;
1.1       nicm      101:        len = (len * 5) / 4;
                    102:
1.4       nicm      103:        if ((newbuf = realloc(buf, len)) == NULL)
                    104:                goto error;
1.1       nicm      105:        buf = newbuf;
                    106:
1.7       guenther  107:        mib[5] = (int)(len / sizeof(struct kinfo_proc));
1.1       nicm      108:        if (sysctl(mib, nitems(mib), buf, &len, NULL, 0) == -1) {
                    109:                if (errno == ENOMEM)
                    110:                        goto retry;
1.4       nicm      111:                goto error;
1.1       nicm      112:        }
                    113:
                    114:        bestp = NULL;
1.7       guenther  115:        for (i = 0; i < len / sizeof (struct kinfo_proc); i++) {
1.6       guenther  116:                if ((dev_t)buf[i].p_tdev != sb.st_rdev)
1.1       nicm      117:                        continue;
1.4       nicm      118:                if (bestp == NULL)
1.6       guenther  119:                        bestp = &buf[i];
1.4       nicm      120:                else
1.6       guenther  121:                        bestp = cmp_procs(&buf[i], bestp);
1.1       nicm      122:        }
                    123:
                    124:        name = NULL;
                    125:        if (bestp != NULL)
                    126:                name = strdup(bestp->p_comm);
                    127:
                    128:        free(buf);
                    129:        return (name);
1.4       nicm      130:
                    131: error:
                    132:        free(buf);
                    133:        return (NULL);
1.1       nicm      134: }