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* Merge branch 'jk/a-thread-only-dies-once'Junio C Hamano2013-04-19
|\ | | | | | | | | | | | | | | | | A regression fix for the logic to detect die() handler triggering itself recursively. * jk/a-thread-only-dies-once: run-command: use thread-aware die_is_recursing routine usage: allow pluggable die-recursion checks
| * usage: allow pluggable die-recursion checksJeff King2013-04-16
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | When any git code calls die or die_errno, we use a counter to detect recursion into the die functions from any of the helper functions. However, such a simple counter is not good enough for threaded programs, which may call die from a sub-thread, killing only the sub-thread (but incrementing the counter for everyone). Rather than try to deal with threads ourselves here, let's just allow callers to plug in their own recursion-detection function. This is similar to how we handle the die routine (the caller plugs in a die routine which may kill only the sub-thread). Signed-off-by: Jeff King <peff@peff.net> Signed-off-by: Junio C Hamano <gitster@pobox.com>
* | make error()'s constant return value more visibleJeff King2012-12-15
|/ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | When git is compiled with "gcc -Wuninitialized -O3", some inlined calls provide an additional opportunity for the compiler to do static analysis on variable initialization. For example, with two functions like this: int get_foo(int *foo) { if (something_that_might_fail() < 0) return error("unable to get foo"); *foo = 0; return 0; } void some_fun(void) { int foo; if (get_foo(&foo) < 0) return -1; printf("foo is %d\n", foo); } If get_foo() is not inlined, then when compiling some_fun, gcc sees only that a pointer to the local variable is passed, and must assume that it is an out parameter that is initialized after get_foo returns. However, when get_foo() is inlined, the compiler may look at all of the code together and see that some code paths in get_foo() do not initialize the variable. As a result, it prints a warning. But what the compiler can't see is that error() always returns -1, and therefore we know that either we return early from some_fun, or foo ends up initialized, and the code is safe. The warning is a false positive. If we can make the compiler aware that error() will always return -1, it can do a better job of analysis. The simplest method would be to inline the error() function. However, this doesn't work, because gcc will not inline a variadc function. We can work around this by defining a macro. This relies on two gcc extensions: 1. Variadic macros (these are present in C99, but we do not rely on that). 2. Gcc treats the "##" paste operator specially between a comma and __VA_ARGS__, which lets our variadic macro work even if no format parameters are passed to error(). Since we are using these extra features, we hide the macro behind an #ifdef. This is OK, though, because our goal was just to help gcc. Signed-off-by: Jeff King <peff@peff.net> Signed-off-by: Junio C Hamano <gitster@pobox.com>
* usage.c: detect recursion in die routines and bail out immediatelyBrandon Casey2012-11-15
| | | | | | | | | | It is theoretically possible for a die handler to get into a state of infinite recursion. For example, if a die handler called another function which itself called die(). Let's at least detect this situation, inform the user, and call exit. Signed-off-by: Brandon Casey <bcasey@nvidia.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
* error_routine: use parent's stderr if exec failsClemens Buchacher2011-07-31
| | | | | | | | | | The new process's error output may be redirected elsewhere, but if the exec fails, output should still go to the parent's stderr. This has already been done for the die_routine. Do the same for error_routine. Signed-off-by: Clemens Buchacher <drizzd@aon.at> Signed-off-by: Junio C Hamano <gitster@pobox.com>
* Fix sparse warningsStephen Boyd2011-03-22
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Fix warnings from 'make check'. - These files don't include 'builtin.h' causing sparse to complain that cmd_* isn't declared: builtin/clone.c:364, builtin/fetch-pack.c:797, builtin/fmt-merge-msg.c:34, builtin/hash-object.c:78, builtin/merge-index.c:69, builtin/merge-recursive.c:22 builtin/merge-tree.c:341, builtin/mktag.c:156, builtin/notes.c:426 builtin/notes.c:822, builtin/pack-redundant.c:596, builtin/pack-refs.c:10, builtin/patch-id.c:60, builtin/patch-id.c:149, builtin/remote.c:1512, builtin/remote-ext.c:240, builtin/remote-fd.c:53, builtin/reset.c:236, builtin/send-pack.c:384, builtin/unpack-file.c:25, builtin/var.c:75 - These files have symbols which should be marked static since they're only file scope: submodule.c:12, diff.c:631, replace_object.c:92, submodule.c:13, submodule.c:14, trace.c:78, transport.c:195, transport-helper.c:79, unpack-trees.c:19, url.c:3, url.c:18, url.c:104, url.c:117, url.c:123, url.c:129, url.c:136, thread-utils.c:21, thread-utils.c:48 - These files redeclare symbols to be different types: builtin/index-pack.c:210, parse-options.c:564, parse-options.c:571, usage.c:49, usage.c:58, usage.c:63, usage.c:72 - These files use a literal integer 0 when they really should use a NULL pointer: daemon.c:663, fast-import.c:2942, imap-send.c:1072, notes-merge.c:362 While we're in the area, clean up some unused #includes in builtin files (mostly exec_cmd.h). Signed-off-by: Stephen Boyd <bebarino@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
* Make report() from usage.c public as vreportf() and use it.Johannes Sixt2010-03-07
| | | | | | | | There exist already a number of static functions named 'report', therefore, the function name was changed. Signed-off-by: Johannes Sixt <j6t@kdbg.org> Signed-off-by: Junio C Hamano <gitster@pobox.com>
* Fix truncated usage messagesBjörn Gustavsson2009-11-22
| | | | | | | | | | | | | | | | The usage messages for some commands (such as 'git diff-tree') are truncated because they don't fit in a fixed buffer of 1024 bytes. It would be tempting to eliminate the buffer and the problem once and for all by doing the output in three steps, but doing so could (according to commit d048a96e) increase the likelyhood of messing up the display. So we just increase the size of the buffer. Signed-off-by: Björn Gustavsson <bgustavsson@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
* Introduce usagef() that takes a printf-style formatJonathan Nieder2009-11-10
| | | | | | | | | | | | | | | | | | Some new callers would want to use printf-like formatting, when issuing their usage messages. An option is to change usage() itself also be like printf(), which would make it similar to die() and warn(). But usage() is typically fixed, as opposed to die() and warn() that gives diagnostics depending on the situation. Indeed, the majority of strings given by existing callsites to usage() are fixed strings. If we were to make usage() take printf-style format, they all need to be changed to have "%s" as their first argument. So instead, introduce usagef() so that limited number of callers can use it. Signed-off-by: Jonathan Nieder <jrnieder@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
* add NORETURN_PTR for function pointersErik Faye-Lund2009-10-01
| | | | | | | | | | | | Some compilers (including at least MSVC and ARM RVDS) supports NORETURN on function declarations, but not on function pointers. This patch makes it possible to define NORETURN for these compilers, by splitting the NORETURN macro into two - one for function declarations and one for function pointers. Signed-off-by: Erik Faye-Lund <kusmabite@gmail.com> Signed-off-by: Jeff King <peff@peff.net>
* increase portability of NORETURN declarationsErik Faye-Lund2009-10-01
| | | | | | | | | | | Some compilers (including at least MSVC) support NORETURN on function declarations, but only before the function-name. This patch makes it possible to define NORETURN to something meaningful for those compilers. Signed-off-by: Erik Faye-Lund <kusmabite@gmail.com> Signed-off-by: Jeff King <peff@peff.net>
* die_errno(): double % in strerror() output just in caseJunio C Hamano2009-06-27
| | | | | | | | [tr: handle border case where % is placed at end of buffer] Signed-off-by: Junio C Hamano <gitster@pobox.com> Signed-off-by: Thomas Rast <trast@student.ethz.ch> Signed-off-by: Junio C Hamano <gitster@pobox.com>
* Introduce die_errno() that appends strerror(errno) to die()Thomas Rast2009-06-27
| | | | | | | | | | | | | | | | | | There are many calls to die() that do, or should, report strerror(errno) to indicate how the syscall they guard failed. Introduce a small helper function for this case. Note: - POSIX says vsnprintf can modify errno in some unlikely cases, so we have to use errno early. - We take some care to pass the original format to die_routine(), in case someone wants to call die_errno() with custom format characters. Signed-off-by: Thomas Rast <trast@student.ethz.ch> Signed-off-by: Junio C Hamano <gitster@pobox.com>
* Increase the size of the die/warning buffer to avoid truncationShawn O. Pearce2009-03-24
| | | | | | | | | Long messages like those from lockfile.c when a lock can't be obtained truncate with only 256 bytes in the message buffer. Bump it to 1024 to give more space for these longer cases. Signed-off-by: Shawn O. Pearce <spearce@spearce.org> Signed-off-by: Junio C Hamano <gitster@pobox.com>
* usage.c: remove unused functionsNanako Shiraishi2008-09-29
| | | | | | | | This removes three functions that are not used anywhere. Signed-off-by: Nanako Shiraishi <nanako3@lavabit.com> Acked-by: Lars Hjemli <hjemli@gmail.com> Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
* print warning/error/fatal messages in one shotNicolas Pitre2007-11-09
| | | | | | | | Not doing so is likely to create a messed up display when sent over the sideband protocol. Signed-off-by: Nicolas Pitre <nico@cam.org> Signed-off-by: Junio C Hamano <gitster@pobox.com>
* Rename warn() to warning() to fix symbol conflicts on BSD and Mac OSTheodore Ts'o2007-03-31
| | | | | | | | | | | | | | | | | This fixes a problem reported by Randal Schwartz: >I finally tracked down all the (albeit inconsequential) errors I was getting >on both OpenBSD and OSX. It's the warn() function in usage.c. There's >warn(3) in BSD-style distros. It'd take a "great rename" to change it, but if >someone with better C skills than I have could do that, my linker and I would >appreciate it. It was annoying to me, too, when I was doing some mergetool testing on Mac OS X, so here's a fix. Signed-off-by: "Theodore Ts'o" <tytso@mit.edu> Cc: "Randal L. Schwartz" <merlyn@stonehenge.com> Signed-off-by: Junio C Hamano <junkio@cox.net>
* Introduce a global level warn() function.Shawn O. Pearce2006-12-21
| | | | | | | | | | | | | | Like the existing error() function the new warn() function can be used to describe a situation that probably should not be occuring, but which the user (and Git) can continue to work around without running into too many problems. An example situation is a bad commit SHA1 found in a reflog. Attempting to read this record out of the reflog isn't really an error as we have skipped over it in the past. Signed-off-by: Shawn O. Pearce <spearce@spearce.org> Signed-off-by: Junio C Hamano <junkio@cox.net>
* usage: minimum type fix.Junio C Hamano2006-06-24
| | | | Signed-off-by: Junio C Hamano <junkio@cox.net>
* Customizable error handlersPetr Baudis2006-06-24
| | | | | | | | | | | | | | This patch makes the usage(), die() and error() handlers customizable. Nothing in the git code itself uses that but many other libgit users (like Git.pm) will. This is implemented using the mutator functions primarily because you cannot directly modifying global variables of libgit from a program that dlopen()ed it, apparently. But having functions for that is a better API anyway. Signed-off-by: Petr Baudis <pasky@suse.cz> Signed-off-by: Junio C Hamano <junkio@cox.net>
* Clean up compatibility definitions.Junio C Hamano2005-12-05
| | | | | | | | | | | | | | | | | | This attempts to clean up the way various compatibility functions are defined and used. - A new header file, git-compat-util.h, is introduced. This looks at various NO_XXX and does necessary function name replacements, equivalent of -Dstrcasestr=gitstrcasestr in the Makefile. - Those function name replacements are removed from the Makefile. - Common features such as usage(), die(), xmalloc() are moved from cache.h to git-compat-util.h; cache.h includes git-compat-util.h itself. Signed-off-by: Junio C Hamano <junkio@cox.net>
* [PATCH] Better error reporting for "git status"Linus Torvalds2005-10-01
| | | | | | | | | | | | | | | | | | | | Instead of "git status" ignoring (and hiding) potential errors from the "git-update-index" call, make it exit if it fails, and show the error. In order to do this, use the "-q" flag (to ignore not-up-to-date files) and add a new "--unmerged" flag that allows unmerged entries in the index without any errors. This also avoids marking the index "changed" if an entry isn't actually modified, and makes sure that we exit with an understandable error message if the index is corrupt or unreadable. "read_cache()" no longer returns an error for the caller to check. Finally, make die() and usage() exit with recognizable error codes, if we ever want to check the failure reason in scripts. Signed-off-by: Linus Torvalds <torvalds@osdl.org> Signed-off-by: Junio C Hamano <junkio@cox.net>
* Include file cleanups..Linus Torvalds2005-05-22
| | | | | | | Add <limits.h> to the include files handled by "cache.h", and remove extraneous #include directives from various .c files. The rule is that "cache.h" gets all the basic stuff, so that we'll have as few system dependencies as possible.
* Split up read-cache.c into more logical clumps.Linus Torvalds2005-04-18
Do the usage and error reporting in "usage.c", and the sha1 file accesses in "sha1_file.c". Small, nice, easily separated parts. Good.