gcc下的“段错误”是怎么回事？

tuboshu · 发表于 2003-4-18 09:06:35

编译命令我用的是 gcc -Wall -o * *.c
没有错误提示，
但在执行 ./* 命令时它告诉我是“段错误”。
这是怎么回事？

mikeshi · 发表于 2003-4-18 10:16:38

编程错误，可能的原因爆多，看看是不是出现了类似
int a;
scanf("%d",a);
这样的错误，这个错误就会引发这个segment fault的。

Dragonfly · 发表于 2003-4-18 11:06:34

this is nothing to do with the gcc, its the problem in u code. the most frequent error is pointer error. if u code is not so long, post it online.

tuboshu · 发表于 2003-4-19 10:08:50

我写的是个关于数值分析的程序，代码比较长，
我检查了一遍没有出现 mikeshi 兄说的那种错误，
也没有用到指针。

Dragonfly · 发表于 2003-4-19 10:14:59

can u download a valgrind and use it to detect the illlegal memory use in u program? it is easy to use.

tuboshu · 发表于 2003-4-19 11:12:00

thank you.
but where I can find it ?

Dragonfly · 发表于 2003-4-19 11:17:57

search from web. pls

tuboshu · 发表于 2003-4-19 11:53:35

"Program received signal SIGSEGV, Segmentation fault."

when I run the program in gdb. It show me this sentence.
what does the word "SIGSEGV" mean ?
Thank you !

Dragonfly · 发表于 2003-4-19 12:00:05

that is u program has illegal operation, so system send such a signal to u. u can add some print to see where u segment fault. i forget, but there is a way to run gdb and break u program when have such illegal access.
i still suggest u to search and download this valgrind, it can generate a report to show which one is wrong.

Dragonfly · 发表于 2003-4-19 12:02:07

can u check u array index. do u malloc the mem for pointer? or u can find some info from web to check how to utilize that core dump.

Dragonfly · 发表于 2003-4-19 12:13:03

try this
http://www-acs.ucsd.edu/offerings/userhelp/HTML/dbx.debug.main,d.html#label1

mikeshi · 发表于 2003-4-19 13:47:57

[quote:fc1014fc7b="tuboshu"]我写的是个关于数值分析的程序，代码比较长，
我检查了一遍没有出现 mikeshi 兄说的那种错误，
也没有用到指针。[/quote]
我只是举个例子，引起这个错误的有很多可能，甚至，比如在dos3.0下的软件有些在6.22下使用也会有这个错误

tuboshu · 发表于 2003-4-19 16:11:52

[quote:b4f4fe8732="cheungming"]that is u program has illegal operation, so system send such a signal to u. u can add some print to see where u segment fault. i forget, but there is a way to run gdb and break u program when have such illegal access.
i still suggest u to search and download this valgrind, it can generate a report to show which one is wrong.[/quote]
Thank you!

tuboshu · 发表于 2003-4-19 16:14:07

[quote:e14e57010b="mikeshi"][quote:e14e57010b="tuboshu"]我写的是个关于数值分析的程序，代码比较长，
我检查了一遍没有出现 mikeshi 兄说的那种错误，
也没有用到指针。[/quote]
我只是举个例子，引起这个错误的有很多可能，甚至，比如在dos3.0下的软件有些在6.22下使用也会有这个错误[/quote]
没错！我在BC 3.1 下面编译了一下
它只是告诉我程序出现而中断运行

andot · 发表于 2003-4-19 16:43:09

我昨天用rm删除一个目录还出现段错误呢，然后整个系统就不能用了。后来发现好象那个分区的文件分配表坏了(我的home分区，惨啊)，只好备份，格式化，重建用户，恢复备份才解决这个问题。
所以谁知道段错误是个什么错误啊，大概就是说你的系统隔屁了。

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