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3a0942598c
This avoids a potential race condition when async procedures are implemented as threads where release_pack_memory() can be called from different threads without locking under memory pressure. Signed-off-by: Johannes Sixt <j6t@kdbg.org> Signed-off-by: Junio C Hamano <gitster@pobox.com>
134 lines
3.6 KiB
C
134 lines
3.6 KiB
C
/*
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* GIT - The information manager from hell
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*
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* Copyright (C) 2000-2002 Michael R. Elkins <me@mutt.org>
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* Copyright (C) 2002-2004 Oswald Buddenhagen <ossi@users.sf.net>
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* Copyright (C) 2004 Theodore Y. Ts'o <tytso@mit.edu>
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* Copyright (C) 2006 Mike McCormack
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* Copyright (C) 2006 Christian Couder
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program 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
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include "cache.h"
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#include "quote.h"
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void do_nothing(size_t unused)
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{
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}
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/* Get a trace file descriptor from GIT_TRACE env variable. */
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static int get_trace_fd(int *need_close)
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{
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char *trace = getenv("GIT_TRACE");
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if (!trace || !strcmp(trace, "") ||
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!strcmp(trace, "0") || !strcasecmp(trace, "false"))
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return 0;
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if (!strcmp(trace, "1") || !strcasecmp(trace, "true"))
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return STDERR_FILENO;
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if (strlen(trace) == 1 && isdigit(*trace))
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return atoi(trace);
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if (is_absolute_path(trace)) {
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int fd = open(trace, O_WRONLY | O_APPEND | O_CREAT, 0666);
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if (fd == -1) {
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fprintf(stderr,
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"Could not open '%s' for tracing: %s\n"
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"Defaulting to tracing on stderr...\n",
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trace, strerror(errno));
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return STDERR_FILENO;
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}
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*need_close = 1;
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return fd;
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}
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fprintf(stderr, "What does '%s' for GIT_TRACE mean?\n", trace);
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fprintf(stderr, "If you want to trace into a file, "
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"then please set GIT_TRACE to an absolute pathname "
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"(starting with /).\n");
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fprintf(stderr, "Defaulting to tracing on stderr...\n");
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return STDERR_FILENO;
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}
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static const char err_msg[] = "Could not trace into fd given by "
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"GIT_TRACE environment variable";
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void trace_printf(const char *fmt, ...)
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{
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struct strbuf buf;
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va_list ap;
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int fd, len, need_close = 0;
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fd = get_trace_fd(&need_close);
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if (!fd)
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return;
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set_try_to_free_routine(do_nothing); /* is never reset */
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strbuf_init(&buf, 64);
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va_start(ap, fmt);
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len = vsnprintf(buf.buf, strbuf_avail(&buf), fmt, ap);
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va_end(ap);
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if (len >= strbuf_avail(&buf)) {
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strbuf_grow(&buf, len - strbuf_avail(&buf) + 128);
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va_start(ap, fmt);
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len = vsnprintf(buf.buf, strbuf_avail(&buf), fmt, ap);
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va_end(ap);
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if (len >= strbuf_avail(&buf))
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die("broken vsnprintf");
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}
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strbuf_setlen(&buf, len);
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write_or_whine_pipe(fd, buf.buf, buf.len, err_msg);
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strbuf_release(&buf);
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if (need_close)
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close(fd);
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}
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void trace_argv_printf(const char **argv, const char *fmt, ...)
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{
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struct strbuf buf;
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va_list ap;
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int fd, len, need_close = 0;
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fd = get_trace_fd(&need_close);
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if (!fd)
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return;
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set_try_to_free_routine(do_nothing); /* is never reset */
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strbuf_init(&buf, 64);
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va_start(ap, fmt);
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len = vsnprintf(buf.buf, strbuf_avail(&buf), fmt, ap);
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va_end(ap);
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if (len >= strbuf_avail(&buf)) {
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strbuf_grow(&buf, len - strbuf_avail(&buf) + 128);
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va_start(ap, fmt);
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len = vsnprintf(buf.buf, strbuf_avail(&buf), fmt, ap);
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va_end(ap);
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if (len >= strbuf_avail(&buf))
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die("broken vsnprintf");
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}
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strbuf_setlen(&buf, len);
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sq_quote_argv(&buf, argv, 0);
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strbuf_addch(&buf, '\n');
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write_or_whine_pipe(fd, buf.buf, buf.len, err_msg);
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strbuf_release(&buf);
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if (need_close)
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close(fd);
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}
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