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Top Forums Shell Programming and Scripting Cygwin script log redirection not working well Post 302731253 by Corona688 on Wednesday 14th of November 2012 03:04:35 PM
Old 11-14-2012
Quote:
Originally Posted by heykiran
I understand that the log will be mixed up as I am running the curl command in the background. But the echo request should be in the log for 20 times right?
Not necessarily.

Process 1 writes to the file.

Process 2 writes a fraction later, and isn't aware the file has been appended to, overwriting the section the previous one just wrote. Or worse, overwriting part of the section, since one may be longer than the other.

That code works "a lot of the time" doesn't mean it won't occasionally blow up in your face, in ways you can't predict. In short, don't make them compete for the file like that.
 

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CURLOPT_POSTREDIR(3)					     curl_easy_setopt options					      CURLOPT_POSTREDIR(3)

NAME
CURLOPT_POSTREDIR - how to act on a HTTP POST redirect SYNOPSIS
#include <curl/curl.h> CURLcode curl_easy_setopt(CURL *handle, CURLOPT_POSTREDIR, long bitmask); DESCRIPTION
Pass a bitmask to control how libcurl acts on redirects after POSTs that get a 301, 302 or 303 response back. A parameter with bit 0 set (value CURL_REDIR_POST_301) tells the library to respect RFC 7231 (section 6.4.2 to 6.4.4) and not convert POST requests into GET requests when following a 301 redirection. Setting bit 1 (value CURL_REDIR_POST_302) makes libcurl maintain the request method after a 302 redirect whilst setting bit 2 (value CURL_REDIR_POST_303) makes libcurl maintain the request method after a 303 redirect. The value CURL_REDIR_POST_ALL is a convenience define that sets all three bits. The non-RFC behaviour is ubiquitous in web browsers, so the library does the conversion by default to maintain consistency. However, a server may require a POST to remain a POST after such a redirection. This option is meaningful only when setting CURLOPT_FOLLOWLOCATION(3). DEFAULT
0 PROTOCOLS
HTTP(S) EXAMPLE
CURL *curl = curl_easy_init(); if(curl) { curl_easy_setopt(curl, CURLOPT_URL, "http://example.com"); /* a silly POST example */ curl_easy_setopt(curl, CURLOPT_POSTFIELDS, "data=true"); /* example.com is redirected, so we tell libcurl to send POST on 301, 302 and 303 HTTP response codes */ curl_easy_setopt(curl, CURLOPT_POSTREDIR, CURL_REDIR_POST_ALL); curl_easy_perform(curl); } AVAILABILITY
Added in 7.17.1. This option was known as CURLOPT_POST301 up to 7.19.0 as it only supported the 301 then. CURL_REDIR_POST_303 was added in 7.26.0. RETURN VALUE
Returns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION if not. SEE ALSO
CURLOPT_FOLLOWLOCATION(3), CURLOPT_POSTFIELDS(3), libcurl 7.54.0 February 03, 2016 CURLOPT_POSTREDIR(3)
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