8fcfb01a81
The copyrights of the source files were all out of date and were not the same format. This has been corrected. The source of the authors was examining the git log for each file. Signed-off-by: Craig Small <csmall@dropbear.xyz>
55 lines
1.5 KiB
C
55 lines
1.5 KiB
C
/*
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* wchan.c - kernel symbol handling
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*
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* Copyright © 2015-2023 Jim Warner <james.warner@comcast.net>
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* Copyright © 1998-2003 Albert Cahalan
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include <stdio.h>
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#include <string.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <sys/stat.h>
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#include "wchan.h" // to verify prototype
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const char *lookup_wchan (int pid) {
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static __thread char buf[64];
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const char *ret = buf;
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ssize_t num;
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int fd;
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snprintf(buf, sizeof buf, "/proc/%d/wchan", pid);
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fd = open(buf, O_RDONLY);
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if (fd==-1) return "?";
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num = read(fd, buf, sizeof buf - 1);
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close(fd);
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if (num<1) return "?"; // allow for "0"
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buf[num] = '\0';
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if (buf[0]=='0' && buf[1]=='\0') return "-";
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// lame ppc64 has a '.' in front of every name
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if (*ret=='.') ret++;
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while(*ret=='_') ret++;
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return ret;
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}
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