diff options
Diffstat (limited to 'usr.bin/gcore/gcore.c')
| -rw-r--r-- | usr.bin/gcore/gcore.c | 313 |
1 files changed, 313 insertions, 0 deletions
diff --git a/usr.bin/gcore/gcore.c b/usr.bin/gcore/gcore.c new file mode 100644 index 0000000..2ecca18 --- /dev/null +++ b/usr.bin/gcore/gcore.c @@ -0,0 +1,313 @@ +/*- + * Copyright (c) 1992, 1993 + * The Regents of the University of California. All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. All advertising materials mentioning features or use of this software + * must display the following acknowledgement: + * This product includes software developed by the University of + * California, Berkeley and its contributors. + * 4. Neither the name of the University nor the names of its contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + */ + +#ifndef lint +static char copyright[] = +"@(#) Copyright (c) 1992, 1993\n\ + The Regents of the University of California. All rights reserved.\n"; +#endif /* not lint */ + +#ifndef lint +static char sccsid[] = "@(#)gcore.c 8.2 (Berkeley) 9/23/93"; +#endif /* not lint */ + +/* + * Originally written by Eric Cooper in Fall 1981. + * Inspired by a version 6 program by Len Levin, 1978. + * Several pieces of code lifted from Bill Joy's 4BSD ps. + * Most recently, hacked beyond recognition for 4.4BSD by Steven McCanne, + * Lawrence Berkeley Laboratory. + * + * Portions of this software were developed by the Computer Systems + * Engineering group at Lawrence Berkeley Laboratory under DARPA + * contract BG 91-66 and contributed to Berkeley. + */ +#include <sys/param.h> +#include <sys/time.h> +#include <sys/stat.h> +#include <sys/proc.h> +#include <sys/user.h> +#include <sys/sysctl.h> + +#include <machine/vmparam.h> + +#include <a.out.h> +#include <fcntl.h> +#include <kvm.h> +#include <limits.h> +#include <signal.h> +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <unistd.h> + +#include "extern.h" + +void core __P((int, int, struct kinfo_proc *)); +void datadump __P((int, int, struct proc *, u_long, int)); +void usage __P((void)); +void userdump __P((int, struct proc *, u_long, int)); + +kvm_t *kd; +/* XXX undocumented routine, should be in kvm.h? */ +ssize_t kvm_uread __P((kvm_t *, struct proc *, u_long, char *, size_t)); + +static int data_offset; + +int +main(argc, argv) + int argc; + char *argv[]; +{ + register struct proc *p; + struct kinfo_proc *ki; + struct exec exec; + int ch, cnt, efd, fd, pid, sflag, uid; + char *corefile, errbuf[_POSIX2_LINE_MAX], fname[MAXPATHLEN + 1]; + + sflag = 0; + corefile = NULL; + while ((ch = getopt(argc, argv, "c:s")) != EOF) { + switch (ch) { + case 'c': + corefile = optarg; + break; + case 's': + sflag = 1; + break; + default: + usage(); + break; + } + } + argv += optind; + argc -= optind; + + if (argc != 2) + usage(); + + kd = kvm_openfiles(0, 0, 0, O_RDONLY, errbuf); + if (kd == NULL) + err(1, "%s", errbuf); + + uid = getuid(); + pid = atoi(argv[1]); + + ki = kvm_getprocs(kd, KERN_PROC_PID, pid, &cnt); + if (ki == NULL || cnt != 1) + err(1, "%d: not found", pid); + + p = &ki->kp_proc; + if (ki->kp_eproc.e_pcred.p_ruid != uid && uid != 0) + err(1, "%d: not owner", pid); + + if (p->p_stat == SZOMB) + err(1, "%d: zombie", pid); + + if (p->p_flag & P_WEXIT) + err(0, "process exiting"); + if (p->p_flag & P_SYSTEM) /* Swapper or pagedaemon. */ + err(1, "%d: system process"); + + if (corefile == NULL) { + (void)snprintf(fname, sizeof(fname), "core.%d", pid); + corefile = fname; + } + fd = open(corefile, O_RDWR|O_CREAT|O_TRUNC, DEFFILEMODE); + if (fd < 0) + err(1, "%s: %s\n", corefile, strerror(errno)); + + efd = open(argv[0], O_RDONLY, 0); + if (efd < 0) + err(1, "%s: %s\n", argv[0], strerror(errno)); + + cnt = read(efd, &exec, sizeof(exec)); + if (cnt != sizeof(exec)) + err(1, "%s exec header: %s", + argv[0], cnt > 0 ? strerror(EIO) : strerror(errno)); + + data_offset = N_DATOFF(exec); + + if (sflag && kill(pid, SIGSTOP) < 0) + err(0, "%d: stop signal: %s", pid, strerror(errno)); + + core(efd, fd, ki); + + if (sflag && kill(pid, SIGCONT) < 0) + err(0, "%d: continue signal: %s", pid, strerror(errno)); + (void)close(fd); + + exit(0); +} + +/* + * core -- + * Build the core file. + */ +void +core(efd, fd, ki) + int efd; + int fd; + struct kinfo_proc *ki; +{ + union { + struct user user; + char ubytes[ctob(UPAGES)]; + } uarea; + struct proc *p = &ki->kp_proc; + int tsize = ki->kp_eproc.e_vm.vm_tsize; + int dsize = ki->kp_eproc.e_vm.vm_dsize; + int ssize = ki->kp_eproc.e_vm.vm_ssize; + int cnt; + + /* Read in user struct */ + cnt = kvm_read(kd, (u_long)p->p_addr, &uarea, sizeof(uarea)); + if (cnt != sizeof(uarea)) + err(1, "read user structure: %s", + cnt > 0 ? strerror(EIO) : strerror(errno)); + + /* + * Fill in the eproc vm parameters, since these are garbage unless + * the kernel is dumping core or something. + */ + uarea.user.u_kproc = *ki; + + /* Dump user area */ + cnt = write(fd, &uarea, sizeof(uarea)); + if (cnt != sizeof(uarea)) + err(1, "write user structure: %s", + cnt > 0 ? strerror(EIO) : strerror(errno)); + + /* Dump data segment */ + datadump(efd, fd, p, USRTEXT + ctob(tsize), dsize); + + /* Dump stack segment */ + userdump(fd, p, USRSTACK - ctob(ssize), ssize); + + /* Dump machine dependent portions of the core. */ + md_core(kd, fd, ki); +} + +void +datadump(efd, fd, p, addr, npage) + register int efd; + register int fd; + struct proc *p; + register u_long addr; + register int npage; +{ + register int cc, delta; + char buffer[NBPG]; + + delta = data_offset - addr; + while (--npage >= 0) { + cc = kvm_uread(kd, p, addr, buffer, NBPG); + if (cc != NBPG) { + /* Try to read the page from the executable. */ + if (lseek(efd, (off_t)addr + delta, SEEK_SET) == -1) + err(1, "seek executable: %s", strerror(errno)); + cc = read(efd, buffer, sizeof(buffer)); + if (cc != sizeof(buffer)) + if (cc < 0) + err(1, "read executable: %s", + strerror(errno)); + else /* Assume untouched bss page. */ + bzero(buffer, sizeof(buffer)); + } + cc = write(fd, buffer, NBPG); + if (cc != NBPG) + err(1, "write data segment: %s", + cc > 0 ? strerror(EIO) : strerror(errno)); + addr += NBPG; + } +} + +void +userdump(fd, p, addr, npage) + register int fd; + struct proc *p; + register u_long addr; + register int npage; +{ + register int cc; + char buffer[NBPG]; + + while (--npage >= 0) { + cc = kvm_uread(kd, p, addr, buffer, NBPG); + if (cc != NBPG) + /* Could be an untouched fill-with-zero page. */ + bzero(buffer, NBPG); + cc = write(fd, buffer, NBPG); + if (cc != NBPG) + err(1, "write stack segment: %s", + cc > 0 ? strerror(EIO) : strerror(errno)); + addr += NBPG; + } +} + +void +usage() +{ + (void)fprintf(stderr, "usage: gcore [-s] [-c core] executable pid\n"); + exit(1); +} + +#if __STDC__ +#include <stdarg.h> +#else +#include <varargs.h> +#endif + +void +#if __STDC__ +err(int fatal, const char *fmt, ...) +#else +err(fatal, fmt, va_alist) + int fatal; + char *fmt; + va_dcl +#endif +{ + va_list ap; +#if __STDC__ + va_start(ap, fmt); +#else + va_start(ap); +#endif + (void)fprintf(stderr, "gcore: "); + (void)vfprintf(stderr, fmt, ap); + va_end(ap); + (void)fprintf(stderr, "\n"); + exit(1); + /* NOTREACHED */ +} |
