Bump fork from 0.3.1 to 0.6.0

[dependabot]

Bumps fork from 0.3.1 to 0.6.0.

Release notes

Sourced from fork's releases.

Release 0.6.0

Full Changelog: immortal/fork@0.5.0...0.6.0

Changelog

Sourced from fork's changelog.

0.6.0

Breaking Changes

• getpgrp() signature changed - Now returns libc::pid_t directly instead of io::Result<libc::pid_t>
  • getpgrp() always succeeds per POSIX specification and cannot fail
  • Migration guide:
    • Change getpgrp()? to getpgrp()
    • Change getpgrp().expect("...") to getpgrp()
    • Change match getpgrp() { Ok(pgid) => ... } to let pgid = getpgrp();
  • Rationale: Aligns with POSIX.1 specification and matches getpid()/getppid() patterns
  • Verified on Linux, macOS, FreeBSD, OpenBSD per POSIX.1 specification
  • Updated all tests and documentation to reflect this guarantee

Improved

• Enhanced documentation - Comprehensive improvements to library documentation
  • Added "Common Patterns" section with practical examples:
    • Process supervisor using HashMap with Fork
    • Inter-process communication via pipes
    • Daemon with PID file creation
  • Added "Safety and Best Practices" guidelines
  • Added detailed "Common Pitfalls and Safety Considerations" to fork():
    • Mutexes and locks (deadlock risks)
    • File descriptors (shared state issues)
    • Signal handlers (inheritance behavior)
    • Async-signal-safety between fork and exec
    • Memory usage (copy-on-write behavior)
  • Enhanced Fork enum documentation with helper method examples
  • Added "Platform Compatibility" information
• Test quality improvements
  • Replaced deprecated signal() with sigaction() in EINTR tests
  • More portable signal handling for cross-platform compatibility
  • Renamed test_getpgrp_returns_io_error_type to test_getpgrp_returns_pid_type
  • Updated test README to reflect current test descriptions

Fixed

• Documentation warnings - Resolved doctest warnings about main function wrapping
• EINTR resilience - close_fd and redirect_stdio now retry on EINTR for close/open/dup2, preventing spurious failures under signal-heavy conditions on Linux, macOS, and BSD
• Daemon exit safety - Replaced std::process::exit in post-fork parents with libc::_exit to avoid running non-async-signal-safe destructors, preventing undefined behavior between fork() and exec()

Code Quality

• Modernized C string handling - Replaced runtime CString::new() allocations with compile-time c"" string literals (Rust 2024 feature)
  • chdir() now uses c"/" instead of CString::new("/")
  • redirect_stdio() now uses c"/dev/null" instead of CString::new("/dev/null")
  • Benefits: Eliminated dead error handling code, zero runtime overhead, compile-time validation
  • No API changes, fully backward compatible
• Enhanced code clarity - Added clarifying comments to redirect_stdio() error handling logic explaining conditional cleanup of file descriptors
• Comprehensive test coverage - Added 12 dedicated tests for chdir() function (346 lines)
  • Tests idempotent behavior, process isolation, concurrent usage
  • Validates modern c"" string literal implementation
  • Tests integration with setsid() (daemon pattern)

... (truncated)

Commits

• 4916145 bump version to 0.6.0
• bb9c329 cargo +nightly test --all-targets;
• e495a34 coveralls badge
• 733a49d chdir() now uses
• 9cbe315 close_retry tests
• 239713f using libc::_exit()
• c8388ba pre-0.6.0
• b0fdc4a clippy fix
• 0d8897a 0.5.0
• 8f5c30b braking changes waitpid() returns lib::c_int pre 0.5.0
• Additional commits viewable in compare view

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