大约有 6,900 项符合查询结果（耗时：0.0320秒） [XML]
How to automatically generate a stacktrace when my program crashes
...e_symbols_fd(array, size, STDERR_FILENO);
exit(1);
}
void baz() {
int *foo = (int*)-1; // make a bad pointer
printf("%d\n", *foo); // causes segfault
}
void bar() { baz(); }
void foo() { bar(); }
int main(int argc, char **argv) {
signal(SIGSEGV, handler); // install our handler
...
Clean code to printf size_t in C++ (or: Nearest equivalent of C99's %z in C++)
...you can still combine it with IOStreams to get type-safe behavior:
size_t foo = bar;
ostringstream os;
os << foo;
printf("%s", os.str().c_str());
It's not super-efficient, but your case above deals with file I/O, so that's your bottleneck, not this string formatting code.
...
Moving from CVS to Git: $Id$ equivalent?
...sion like I expected. You have to re-co the file, for example,
git commit foo.sh
rm foo.sh
git co foo.sh
And then you will see the expansion, for example:
$ head foo.sh
#!/bin/sh
# $Id: e184834e6757aac77fd0f71344934b1cd774e6d4 $
Some good information is in How do I enable the ident string for...
Most lightweight way to create a random string and a random hexadecimal number
...n xrange(30))", "import random")
>>> t2 = timeit.Timer("binascii.b2a_hex(os.urandom(15))", "import os, binascii")
>>> t3 = timeit.Timer("'%030x' % random.randrange(16**30)", "import random")
>>> for t in t1, t2, t3:
... t.timeit()
...
28.165037870407104
9.029273986816...
Can two different strings generate the same MD5 hash code?
...84bf36e8e4b55b35f427593d849676da0d1d55d8360fb5f07fea2 | fold -w2)
--- /dev/fd/63 2016-02-05 12:55:04.000000000 +0000
+++ /dev/fd/62 2016-02-05 12:55:04.000000000 +0000
@@ -33,7 +33,7 @@
af
bf
a2
-00
+02
a8
28
4b
@@ -53,7 +53,7 @@
6d
a0
d1
-55
+d5
5d
83
60
Above collision example is t...
What characters do I need to escape in XML documents?
... as &amp; unless & is starting an &entity;.
Attribute Values (9% important to remember)
attr=" 'Single quotes' are ok within double quotes."
attr=' "Double quotes" are ok within single quotes.'
Escape " as &quot; and ' as &apos; otherwise.
Comments, CDATA, and Processing Inst...
Which characters need to be escaped when using Bash?
... in a format that can be reused as shell input.
Some samples:
read foo
Hello world
printf "%q\n" "$foo"
Hello\ world
printf "%q\n" $'Hello world!\n'
$'Hello world!\n'
This could be used through variables too:
printf -v var "%q" "$foo
"
echo "$var"
$'Hello world\n'
Quick check with all (12...
What is a bus error?
... ftruncate */
#include <sys/mman.h> /* mmap */
int main() {
int fd;
int *map;
int size = sizeof(int);
char *name = "/a";
shm_unlink(name);
fd = shm_open(name, O_RDWR | O_CREAT, (mode_t)0600);
/* THIS is the cause of the problem. */
/*ftruncate(fd, size);*/
...
Redirect STDERR / STDOUT of a process AFTER it's been started, using command line?
...it
e.g.:
$ tail -f /var/log/lastlog &
[1] 5636
$ ls -l /proc/5636/fd
total 0
lrwx------ 1 myuser myuser 64 Feb 27 07:36 0 -> /dev/pts/0
lrwx------ 1 myuser myuser 64 Feb 27 07:36 1 -> /dev/pts/0
lrwx------ 1 myuser myuser 64 Feb 27 07:36 2 -> /dev/pts/0
lr-x------ 1 myuser myuser 6...
Git 工具 - 子模块(submodule)：一个仓库包含另一个仓库 - 开源 & Github -...
...
$ git diff
diff --git a/.gitmodules b/.gitmodules
index 6fc0b3d..fd1cc29 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -1,3 +1,4 @@
[submodule "DbConnector"]
path = DbConnector
url = https://github.com/chaconinc/DbConnector
+ branch = stable
Submodule DbConn...