904c148f1c
Previously we invoked the sysctl with a NULL buffer to query the size, allocated a buffer, then invoked it again to fetch the data. As we only handle the case where the sysctl provides data of the expected size we can just allocate a correctly-sized buffer to begin with. Reported by: Thomas Hurst via Twitter Reviewed by: kevans MFC after: 1 week Sponsored by: The FreeBSD Foundation Differential Revision: https://reviews.freebsd.org/D35140
72 lines
2.1 KiB
C
72 lines
2.1 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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*
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* Copyright (c) 2009 Ulf Lilleengen
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/sysctl.h>
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#include <sys/user.h>
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#include <stdlib.h>
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#include <string.h>
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#include "libutil.h"
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struct kinfo_proc *
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kinfo_getproc(pid_t pid)
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{
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struct kinfo_proc *kipp;
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int mib[4];
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size_t len;
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len = sizeof(*kipp);
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kipp = malloc(len);
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if (kipp == NULL)
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return (NULL);
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mib[0] = CTL_KERN;
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mib[1] = KERN_PROC;
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mib[2] = KERN_PROC_PID;
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mib[3] = pid;
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if (sysctl(mib, nitems(mib), kipp, &len, NULL, 0) < 0)
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goto bad;
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if (len != sizeof(*kipp))
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goto bad;
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if (kipp->ki_structsize != sizeof(*kipp))
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goto bad;
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if (kipp->ki_pid != pid)
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goto bad;
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return (kipp);
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bad:
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free(kipp);
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return (NULL);
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}
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