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library/wchan.c
54 строки
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Craig Small
misc: Update the copyrights of files
07 фев 2023, 13:09
07 фев 2023, 13:09
8fcfb01
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/* * wchan.c - kernel symbol handling * * Copyright © 2015-2023 Jim Warner <james.warner@comcast.net> * Copyright © 1998-2003 Albert Cahalan * * This library is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2.1 of the License, or (at your option) any later version. * * This library is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with this library; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ #include <stdio.h> #include <string.h> #include <fcntl.h> #include <unistd.h> #include <sys/stat.h> #include "wchan.h" // to verify prototype const char *lookup_wchan (int pid) { static __thread char buf[64]; const char *ret = buf; ssize_t num; int fd; snprintf(buf, sizeof buf, "/proc/%d/wchan", pid); fd = open(buf, O_RDONLY); if (fd==-1) return "?"; num = read(fd, buf, sizeof buf - 1); close(fd); if (num<1) return "?"; // allow for "0" buf[num] = '\0'; if (buf[0]=='0' && buf[1]=='\0') return "-"; // lame ppc64 has a '.' in front of every name if (*ret=='.') ret++; while(*ret=='_') ret++; return ret; }