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How to debug CGI over fcgiwrap/nginx
Nginx & fcgiwrap, logging perl errors to error logIn Nginx, how can I rewrite all http requests to https while maintaining sub-domain?Nginx + PHP FASTCGI FAILS - how to debug?How does nginx support cgi?CGI permissions with NGINX & FastCGInginx + fcgiwrap: how come order of fastcgi_param matters?Nginx returning 408 error with XHR2 file uploads during mid-uploadnginx can't find cgi two levels deepphp servers without apache/nginx/cgi stackNginx serving C++ cgi script: response is binary formatNginx and fcgiwrap, incremental output problems
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I serve executable scripts (mainly in C) through fcgiwrap connected with nginx. Since the scripts are complied, I can get the coding errors during compilation, but sometimes I receive CGI errors simply stating
An error occurred while reading CGI reply (no response received)
Is there any debugging approach to identify what is wrong with the CGI request/proces?
How can I set a debugging system to deliver the errors into the nginx log?
nginx fastcgi cgi debugging
asked Aug 21 '13 at 5:08
GooglebotGooglebot
52321127
add a comment |
I serve executable scripts (mainly in C) through fcgiwrap connected with nginx. Since the scripts are complied, I can get the coding errors during compilation, but sometimes I receive CGI errors simply stating
An error occurred while reading CGI reply (no response received)
Is there any debugging approach to identify what is wrong with the CGI request/proces?
How can I set a debugging system to deliver the errors into the nginx log?
nginx fastcgi cgi debugging
asked Aug 21 '13 at 5:08
GooglebotGooglebot
52321127
Had the same error a few days ago. In my case this was caused by a segfault in the c++-program. Unfortunately the nginx-logs aren't very helpful, so I have to use my internal logger.
– jvlkr
Apr 19 '16 at 7:22
add a comment |
I serve executable scripts (mainly in C) through fcgiwrap connected with nginx. Since the scripts are complied, I can get the coding errors during compilation, but sometimes I receive CGI errors simply stating
An error occurred while reading CGI reply (no response received)
Is there any debugging approach to identify what is wrong with the CGI request/proces?
How can I set a debugging system to deliver the errors into the nginx log?
nginx fastcgi cgi debugging
asked Aug 21 '13 at 5:08
GooglebotGooglebot
52321127
I serve executable scripts (mainly in C) through fcgiwrap connected with nginx. Since the scripts are complied, I can get the coding errors during compilation, but sometimes I receive CGI errors simply stating
An error occurred while reading CGI reply (no response received)
Is there any debugging approach to identify what is wrong with the CGI request/proces?
How can I set a debugging system to deliver the errors into the nginx log?
nginx fastcgi cgi debugging
nginx fastcgi cgi debugging
asked Aug 21 '13 at 5:08
GooglebotGooglebot
52321127
asked Aug 21 '13 at 5:08
GooglebotGooglebot
52321127
asked Aug 21 '13 at 5:08
GooglebotGooglebot
52321127
asked Aug 21 '13 at 5:08
GooglebotGooglebot
52321127
asked Aug 21 '13 at 5:08
GooglebotGooglebot
52321127
52321127
Had the same error a few days ago. In my case this was caused by a segfault in the c++-program. Unfortunately the nginx-logs aren't very helpful, so I have to use my internal logger.
– jvlkr
Apr 19 '16 at 7:22
add a comment |
Had the same error a few days ago. In my case this was caused by a segfault in the c++-program. Unfortunately the nginx-logs aren't very helpful, so I have to use my internal logger.
– jvlkr
Apr 19 '16 at 7:22
Had the same error a few days ago. In my case this was caused by a segfault in the c++-program. Unfortunately the nginx-logs aren't very helpful, so I have to use my internal logger.
– jvlkr
Apr 19 '16 at 7:22
Had the same error a few days ago. In my case this was caused by a segfault in the c++-program. Unfortunately the nginx-logs aren't very helpful, so I have to use my internal logger.
– jvlkr
Apr 19 '16 at 7:22
add a comment |
1 Answer
1
active
oldest
votes
I put a sleep(10); in my C program. Start GDB with your program and set a breakpoint to the command behind the sleep. Then submit your cgi programm in a browser and enter ps axu | grep prog. Type attach <pid> in gdb, you need to do this fast, you have only 10 seconds. Then you can debug your program.
answered May 26 '18 at 16:08
Jochen BuchholzJochen Buchholz
11
add a comment |
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1 Answer
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1 Answer
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active
oldest
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votes
I put a sleep(10); in my C program. Start GDB with your program and set a breakpoint to the command behind the sleep. Then submit your cgi programm in a browser and enter ps axu | grep prog. Type attach <pid> in gdb, you need to do this fast, you have only 10 seconds. Then you can debug your program.
answered May 26 '18 at 16:08
Jochen BuchholzJochen Buchholz
11
add a comment |
I put a sleep(10); in my C program. Start GDB with your program and set a breakpoint to the command behind the sleep. Then submit your cgi programm in a browser and enter ps axu | grep prog. Type attach <pid> in gdb, you need to do this fast, you have only 10 seconds. Then you can debug your program.
answered May 26 '18 at 16:08
Jochen BuchholzJochen Buchholz
11
add a comment |
I put a sleep(10); in my C program. Start GDB with your program and set a breakpoint to the command behind the sleep. Then submit your cgi programm in a browser and enter ps axu | grep prog. Type attach <pid> in gdb, you need to do this fast, you have only 10 seconds. Then you can debug your program.
answered May 26 '18 at 16:08
Jochen BuchholzJochen Buchholz
11
I put a sleep(10); in my C program. Start GDB with your program and set a breakpoint to the command behind the sleep. Then submit your cgi programm in a browser and enter ps axu | grep prog. Type attach <pid> in gdb, you need to do this fast, you have only 10 seconds. Then you can debug your program.
answered May 26 '18 at 16:08
Jochen BuchholzJochen Buchholz
11
answered May 26 '18 at 16:08
Jochen BuchholzJochen Buchholz
11
answered May 26 '18 at 16:08
Jochen BuchholzJochen Buchholz
11
answered May 26 '18 at 16:08
Jochen BuchholzJochen Buchholz
11
11
add a comment |
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Had the same error a few days ago. In my case this was caused by a segfault in the c++-program. Unfortunately the nginx-logs aren't very helpful, so I have to use my internal logger.
– jvlkr
Apr 19 '16 at 7:22