f4d7f9100d
A thread is a struct proc that shares three counted objects with others of its group: the address space (struct mm: page tables, heap top, VMAs and a lock for changing them), the descriptor table, and the signal dispositions. clone() shares what its flags say and fork() copies. - clone(): pthread_create's shape (VM, FILES, SIGHAND, THREAD, SETTLS, PARENT_SETTID, CHILD_CLEARTID) and posix_spawn's (VM, VFORK, a stack). - futex: WAIT, WAIT_BITSET with timeouts, WAKE, REQUEUE, CMP_REQUEUE, keyed by the word's kernel address so shared pages meet. set_tid_address keeps the word that exit zeroes and wakes, for pthread_join. - exit ends a thread; exit_group, a fatal signal, or the leader exiting ends them all. reapd frees exited threads; the leader is reaped by its parent once the rest are gone. getpid is the group, gettid the thread. - Stops and resumes reach every thread; other process signals the leader. - exec kills the other threads and unshares the dispositions. - No TLB shootdown, so pages unmapped from a shared address space are freed only once every CPU has reloaded CR3 or is idle. - procfs: /proc lists processes, task/ lists threads, comm, Threads:, Tgid. - The console honours VMIN 0 / VTIME (btop's input drain hung on it). Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01S1giNvrHTrPMPw7V6x1kQ4
68 lines
3.4 KiB
C
68 lines
3.4 KiB
C
// Error numbers, matching the Linux x86_64 ABI values so that musl-linked
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// programs interpret syscall failures correctly. Kernel code returns these
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// negated (e.g. `return -ENOSYS;`), exactly like Linux does internally.
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#ifndef SCHOS_ERRNO_H
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#define SCHOS_ERRNO_H
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#define EPERM 1 // Operation not permitted
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#define ENOENT 2 // No such file or directory
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#define ESRCH 3 // No such process
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#define EINTR 4 // Interrupted system call
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#define EIO 5 // I/O error
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#define ENXIO 6 // No such device or address
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#define E2BIG 7 // Argument list too long
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#define ENOEXEC 8 // Exec format error
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#define EBADF 9 // Bad file descriptor
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#define ECHILD 10 // No child processes
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#define EAGAIN 11 // Try again
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#define ENOMEM 12 // Out of memory
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#define EACCES 13 // Permission denied
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#define EFAULT 14 // Bad address
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#define ENOTBLK 15 // Block device required
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#define EBUSY 16 // Device or resource busy
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#define EEXIST 17 // File exists
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#define EXDEV 18 // Cross-device link
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#define ENODEV 19 // No such device
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#define ENOTDIR 20 // Not a directory
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#define EISDIR 21 // Is a directory
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#define EINVAL 22 // Invalid argument
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#define ENFILE 23 // File table overflow
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#define EMFILE 24 // Too many open files
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#define ENOTTY 25 // Not a typewriter
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#define EFBIG 27 // File too large
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#define ENOSPC 28 // No space left on device
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#define ESPIPE 29 // Illegal seek
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#define EROFS 30 // Read-only file system
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#define EMLINK 31 // Too many links
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#define EPIPE 32 // Broken pipe
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#define ERANGE 34 // Math result not representable
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#define ENAMETOOLONG 36 // File name too long
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#define ENOLCK 37 // No record locks available
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#define ENOSYS 38 // Function not implemented
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#define ETIMEDOUT 110 // Connection timed out (and a futex wait that ran out)
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#define ENOTEMPTY 39 // Directory not empty
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#define ELOOP 40 // Too many symbolic links encountered
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// Sockets. Same Linux x86_64 values, so strerror() in a musl-linked program
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// prints the message the programmer expected rather than a neighbouring one.
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#define ENOTSOCK 88 // Socket operation on non-socket
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#define EDESTADDRREQ 89 // Destination address required
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#define EMSGSIZE 90 // Message too long
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#define EPROTOTYPE 91 // Protocol wrong type for socket
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#define ENOPROTOOPT 92 // Protocol not available
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#define EPROTONOSUPPORT 93 // Protocol not supported
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#define EOPNOTSUPP 95 // Operation not supported on transport endpoint
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#define EAFNOSUPPORT 97 // Address family not supported by protocol
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#define EADDRINUSE 98 // Address already in use
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#define EADDRNOTAVAIL 99 // Cannot assign requested address
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#define ECONNRESET 104 // Connection reset by peer
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#define EISCONN 106 // Transport endpoint is already connected
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#define ENODATA 61 // No data available -- no such attribute
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#define ENOBUFS 105 // No buffer space available
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#define ENOTSUP 95 // Operation not supported
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#define ENETDOWN 100 // Network is down
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#define ENETUNREACH 101 // Network is unreachable
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#define ENOTCONN 107 // Transport endpoint is not connected
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#define ECONNREFUSED 111 // Connection refused
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#endif // SCHOS_ERRNO_H
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