mirror of
https://github.com/jart/cosmopolitan.git
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57 lines
2.8 KiB
C
57 lines
2.8 KiB
C
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
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│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│
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╞══════════════════════════════════════════════════════════════════════════════╡
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│ Copyright 2023 Justine Alexandra Roberts Tunney │
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│ │
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│ Permission to use, copy, modify, and/or distribute this software for │
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│ any purpose with or without fee is hereby granted, provided that the │
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│ above copyright notice and this permission notice appear in all copies. │
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│ │
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│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
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│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
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│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
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│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
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│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
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│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
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│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
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│ PERFORMANCE OF THIS SOFTWARE. │
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╚─────────────────────────────────────────────────────────────────────────────*/
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#include "libc/calls/calls.h"
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#include "libc/calls/internal.h"
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#include "libc/dce.h"
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#include "libc/log/log.h"
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#include "libc/sysv/consts/f.h"
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#include "libc/sysv/consts/o.h"
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static int __klog_fd;
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extern long __klog_handle;
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/**
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* Redirects kprintf(), `--strace`, etc. output to file.
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*
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* @param path is filename to append to; if null is specified then
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* this file logging facility will be disabled; when the empty
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* string is specified, then the default path shall be used
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* @return 0 on success, or -1 w/ errno
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*/
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int LogKprintfToFile(const char *path) {
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int fd, dd;
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if (!path) {
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if (__klog_fd) {
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__klog_handle = 0;
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close(__klog_fd);
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__klog_fd = 0;
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}
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return 0;
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}
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if (!*path) path = "/tmp/kprintf.log";
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fd = open(path, O_WRONLY | O_APPEND | O_CREAT, 0644);
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if (fd == -1) return -1;
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dd = fcntl(fd, F_DUPFD_CLOEXEC, 100);
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close(fd);
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if (dd == -1) return -1;
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if (__klog_fd) close(__klog_fd);
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__klog_fd = dd;
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__klog_handle = IsWindows() ? g_fds.p[dd].handle : dd;
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return 0;
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}
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