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Don't require an executable file name. If no executable image is
specified, use /proc/<pid>/file. Document it. PR: bin/7915 Suggested-By: Wolfram Schneider <wosch@panke.de.freebsd.org>
This commit is contained in:
Dag-Erling Smørgrav
parent
30173cb8aa
commit
49ee7af69e
Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=39164
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@ -42,7 +42,7 @@ static const char copyright[] =
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static char sccsid[] = "@(#)gcore.c 8.2 (Berkeley) 9/23/93";
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#endif
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static const char rcsid[] =
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"$Id: gcore.c,v 1.7 1997/11/18 03:50:25 jdp Exp $";
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"$Id: gcore.c,v 1.8 1998/08/24 16:25:30 wosch Exp $";
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#endif /* not lint */
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/*
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@ -99,7 +99,8 @@ main(argc, argv)
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struct kinfo_proc *ki;
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struct exec exec;
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int ch, cnt, efd, fd, pid, sflag, uid;
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char *corefile, errbuf[_POSIX2_LINE_MAX], fname[MAXPATHLEN + 1];
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char *binfile, *corefile;
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char errbuf[_POSIX2_LINE_MAX], fname[MAXPATHLEN + 1];
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sflag = 0;
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corefile = NULL;
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@ -119,15 +120,27 @@ main(argc, argv)
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argv += optind;
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argc -= optind;
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if (argc != 2)
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/* XXX we should check that the pid argument is really a number */
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switch (argc) {
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case 1:
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pid = atoi(argv[0]);
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asprintf(&binfile, "/proc/%d/file", pid);
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if (binfile == NULL)
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errx(1, "allocation failure");
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break;
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case 2:
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pid = atoi(argv[1]);
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binfile = argv[0];
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break;
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default:
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usage();
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}
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kd = kvm_openfiles(0, 0, 0, O_RDONLY, errbuf);
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if (kd == NULL)
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errx(1, "%s", errbuf);
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uid = getuid();
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pid = atoi(argv[1]);
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ki = kvm_getprocs(kd, KERN_PROC_PID, pid, &cnt);
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if (ki == NULL || cnt != 1)
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@ -153,21 +166,21 @@ main(argc, argv)
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if (fd < 0)
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err(1, "%s", corefile);
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efd = open(argv[0], O_RDONLY, 0);
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efd = open(binfile, O_RDONLY, 0);
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if (efd < 0)
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err(1, "%s", argv[0]);
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err(1, "%s", binfile);
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cnt = read(efd, &exec, sizeof(exec));
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if (cnt != sizeof(exec))
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errx(1, "%s exec header: %s",
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argv[0], cnt > 0 ? strerror(EIO) : strerror(errno));
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binfile, cnt > 0 ? strerror(EIO) : strerror(errno));
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/* check the text segment size of the executable and the process */
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if (exec.a_text != ptoa(ki->kp_eproc.e_vm.vm_tsize))
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errx(1,
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"The executable %s does not belong to process %d!\n"
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"Text segment size (in bytes): executable %d, process %d",
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argv[0], pid, exec.a_text,
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binfile, pid, exec.a_text,
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ptoa(ki->kp_eproc.e_vm.vm_tsize));
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data_offset = N_DATOFF(exec);
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@ -41,7 +41,8 @@
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.Nm
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.Op Fl s
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.Op Fl c Ar core
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.Ar exec pid
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.Op Ar exec
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.Ar pid
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.Sh DESCRIPTION
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.Nm Gcore
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creates a core image of the specified process,
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@ -49,11 +50,13 @@ suitable for use with
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.Xr gdb 1 .
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By default, the core is written to the file
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.Dq Pa core.<pid> .
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Both the executable image,
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.Ar exec ,
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and the process identifier,
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The process identifier,
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.Ar pid ,
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must be given on the command line.
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must be given on the command line. If no executable image is
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specified,
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.Nm
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will use
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.Dq Pa /proc/<pid>/file .
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.Pp
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The options are:
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.Bl -tag -width indent
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@ -72,6 +75,8 @@ The same effect can be achieved manually with
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.Bl -tag -width /var/log/messages -compact
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.It Pa core.<pid>
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The core image.
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.It Pa /proc/<pid>/file
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The executable image.
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.EL
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.Dp
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.Sh HISTORY
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@ -90,8 +95,3 @@ to temporarily stop the target process.
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is not compatible with the original
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.Bx 4.2
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version.
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In particular,
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.Bx 4.4
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requires the
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.Ar exec
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argument.
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@ -42,7 +42,7 @@ static const char copyright[] =
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static char sccsid[] = "@(#)gcore.c 8.2 (Berkeley) 9/23/93";
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#endif
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static const char rcsid[] =
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"$Id: gcore.c,v 1.7 1997/11/18 03:50:25 jdp Exp $";
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"$Id: gcore.c,v 1.8 1998/08/24 16:25:30 wosch Exp $";
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#endif /* not lint */
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/*
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@ -99,7 +99,8 @@ main(argc, argv)
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struct kinfo_proc *ki;
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struct exec exec;
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int ch, cnt, efd, fd, pid, sflag, uid;
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char *corefile, errbuf[_POSIX2_LINE_MAX], fname[MAXPATHLEN + 1];
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char *binfile, *corefile;
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char errbuf[_POSIX2_LINE_MAX], fname[MAXPATHLEN + 1];
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sflag = 0;
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corefile = NULL;
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@ -119,15 +120,27 @@ main(argc, argv)
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argv += optind;
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argc -= optind;
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if (argc != 2)
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/* XXX we should check that the pid argument is really a number */
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switch (argc) {
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case 1:
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pid = atoi(argv[0]);
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asprintf(&binfile, "/proc/%d/file", pid);
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if (binfile == NULL)
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errx(1, "allocation failure");
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break;
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case 2:
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pid = atoi(argv[1]);
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binfile = argv[0];
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break;
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default:
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usage();
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}
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kd = kvm_openfiles(0, 0, 0, O_RDONLY, errbuf);
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if (kd == NULL)
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errx(1, "%s", errbuf);
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uid = getuid();
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pid = atoi(argv[1]);
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ki = kvm_getprocs(kd, KERN_PROC_PID, pid, &cnt);
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if (ki == NULL || cnt != 1)
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@ -153,21 +166,21 @@ main(argc, argv)
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if (fd < 0)
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err(1, "%s", corefile);
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efd = open(argv[0], O_RDONLY, 0);
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efd = open(binfile, O_RDONLY, 0);
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if (efd < 0)
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err(1, "%s", argv[0]);
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err(1, "%s", binfile);
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cnt = read(efd, &exec, sizeof(exec));
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if (cnt != sizeof(exec))
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errx(1, "%s exec header: %s",
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argv[0], cnt > 0 ? strerror(EIO) : strerror(errno));
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binfile, cnt > 0 ? strerror(EIO) : strerror(errno));
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/* check the text segment size of the executable and the process */
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if (exec.a_text != ptoa(ki->kp_eproc.e_vm.vm_tsize))
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errx(1,
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"The executable %s does not belong to process %d!\n"
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"Text segment size (in bytes): executable %d, process %d",
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argv[0], pid, exec.a_text,
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binfile, pid, exec.a_text,
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ptoa(ki->kp_eproc.e_vm.vm_tsize));
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data_offset = N_DATOFF(exec);
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