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A command line tool and library for transferring data with URL syntax, supporting DICT, FILE, FTP, FTPS, GOPHER, GOPHERS, HTTP, HTTPS, IMAP, IMAPS, LDAP, LDAPS, MQTT, POP3, POP3S, RTMP, RTMPS, RTSP, SCP, SFTP, SMB, SMBS, SMTP, SMTPS, TELNET, TFTP, WS and WSS. libcurl offers a myriad of powerful features
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Viktor Szakats 10bac43b87
tests/server: drop unsafe open() override in signal handler (Windows) 
Turns out the signal handler on Windows still wasn't signal safe after
the previous round of fix. There is an `open()` call made from there,
and `open` happens to be unconditionally overridden via `curl_setup.h`
on Windows, to its local implementation (`curlx_win32_open()`), which
does memory allocations and potentially other things that are not signal
safe.

This is a temporary fix, till avoiding the override of system symbols
`open` and `stat` on Windows.

FTR this did not fix the CI 2304 errors, diskspace fail or job hangs due
to 0xC0000142 fork failure (it's rare all three occurs in the same run):
https://github.com/curl/curl/actions/runs/18110523584?pr=18774

Ref: #18634
Follow-up e95f509c66 #16852
Closes #18774
2025-09-30 01:10:35 +02:00
.circleci CI: make pip use tests/requirements.txt in Circle CI 2025-09-28 00:43:24 +02:00
.github GHA/linux-old: make one cmake v3.7.2 job verbose 2025-09-28 12:33:06 +02:00
CMake vssh: drop support for wolfSSH 2025-09-24 22:59:33 +02:00
docs tidy-up: miscellaneous 2025-09-27 12:59:07 +02:00
include krb5: drop support for Kerberos FTP 2025-09-20 23:58:28 +02:00
lib cmake: use more COMPILER_OPTIONS, LINK_OPTIONS / LINK_FLAGS 2025-09-29 13:07:14 +02:00
LICENSES krb5: drop support for Kerberos FTP 2025-09-20 23:58:28 +02:00
m4 autotools: capitalize 'Rustls' in the log output 2025-09-22 10:11:31 +02:00
packages OS400: fix a use-after-free/double-free case 2025-09-25 10:18:22 +02:00
plan9 copyright: update all copyright lines and remove year ranges 2023-01-03 09:19:21 +01:00
projects build: drop the winbuild build system 2025-09-20 01:20:25 +02:00
scripts perlcheck: parallelize 2025-09-26 23:50:53 +02:00
src cmake: use more COMPILER_OPTIONS, LINK_OPTIONS / LINK_FLAGS 2025-09-29 13:07:14 +02:00
tests tests/server: drop unsafe open() override in signal handler (Windows) 2025-09-30 01:10:35 +02:00
.dir-locals.el copyright: update all copyright lines and remove year ranges 2023-01-03 09:19:21 +01:00
.editorconfig .editorconfig: add 2025-09-02 08:36:40 +02:00
.git-blame-ignore-revs copyright: update all copyright lines and remove year ranges 2023-01-03 09:19:21 +01:00
.gitattributes winbuild: MS-DOS batch tidy-ups 2024-07-02 19:26:15 +02:00
.gitignore build: drop the winbuild build system 2025-09-20 01:20:25 +02:00
.mailmap mailmap: unify on James 2025-09-08 09:26:22 +02:00
acinclude.m4 autotools: fix duplicate UNIX and BSD flags in buildinfo.txt 2025-09-21 18:51:11 +02:00
appveyor.sh build: drop the winbuild build system 2025-09-20 01:20:25 +02:00
appveyor.yml build: drop the winbuild build system 2025-09-20 01:20:25 +02:00
buildconf copyright: update all copyright lines and remove year ranges 2023-01-03 09:19:21 +01:00
CHANGES.md CHANGES: rename to CHANGES.md, no longer generated 2024-08-01 13:37:12 +02:00
CMakeLists.txt vssh: drop support for wolfSSH 2025-09-24 22:59:33 +02:00
configure.ac tidy-up: miscellaneous 2025-09-27 12:59:07 +02:00
COPYING COPYING: bump copyright year range to 1996 - 2025 2025-01-01 21:12:12 +01:00
curl-config.in curl-config: remove X prefix use 2025-08-04 10:01:07 +02:00
Dockerfile Dockerfile: update debian:bookworm-slim Docker digest to df52e55 2025-09-09 15:28:00 +02:00
GIT-INFO.md build: drop tool_hugehelp.c.cvs, tidy up macros, drop buildconf.bat 2025-01-26 14:22:49 +01:00
libcurl.pc.in configure: do not echo most inherited LDFLAGS to config files 2024-11-14 09:55:45 +01:00
Makefile.am vssh: drop support for wolfSSH 2025-09-24 22:59:33 +02:00
README krb5: drop support for Kerberos FTP 2025-09-20 23:58:28 +02:00
README.md krb5: drop support for Kerberos FTP 2025-09-20 23:58:28 +02:00
RELEASE-NOTES RELEASE-NOTES: synced 2025-09-25 23:35:31 +02:00
renovate.json ci: fix ldap install location and add renovate rule for openldap 2025-07-15 14:54:44 +01:00
REUSE.toml build: avoid overriding system symbols for socket functions 2025-09-20 13:44:59 +02:00
SECURITY.md docs: Clarify OpenSSF Best Practices vs Scorecard 2024-08-22 11:50:20 +02:00

README.md

curl logo

curl is a command-line tool for transferring data specified with URL syntax. Learn how to use curl by reading the manpage or everything curl.

Find out how to install curl by reading the INSTALL document.

libcurl is the library curl is using to do its job. It is readily available to be used by your software. Read the libcurl manpage to learn how.

Open Source

curl is Open Source and is distributed under an MIT-like license.

Contact

Contact us on a suitable mailing list or use GitHub issues/ pull requests/ discussions.

All contributors to the project are listed in the THANKS document.

Commercial support

For commercial support, maybe private and dedicated help with your problems or applications using (lib)curl visit the support page.

Website

Visit the curl website for the latest news and downloads.

Source code

Download the latest source from the Git server:

git clone https://github.com/curl/curl.git

Security problems

Report suspected security problems via our HackerOne page and not in public.

Backers

Thank you to all our backers 🙏 Become a backer.

Sponsors

Support this project by becoming a sponsor.