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Linux exit signals and error codes |
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Linux exit signals
From the signal manual: `man 7 signal`.
linux supports the standard signals listed below. Several signal numbers are architecture-dependent, as indicated in the "Value" column. (Where three values are given, the first one is usually valid for alpha and sparc, the
middle one for x86, arm, and most other architectures, and the last one for mips. (Values for parisc are not shown; see the Linux kernel source for signal numbering on that architecture.) A dash (-) denotes that a signal is
absent on the corresponding architecture.
First the signals described in the original POSIX.1-1990 standard.
Signal Value Action Comment
──────────────────────────────────────────────────────────────────────
SIGHUP 1 Term Hangup detected on controlling terminal
or death of controlling process
SIGINT 2 Term Interrupt from keyboard
SIGQUIT 3 Core Quit from keyboard
SIGILL 4 Core Illegal Instruction
SIGABRT 6 Core Abort signal from abort(3)
SIGFPE 8 Core Floating-point exception
SIGKILL 9 Term Kill signal, cannot be caught, blocked or ignored
SIGSEGV 11 Core Invalid memory reference
SIGPIPE 13 Term Broken pipe: write to pipe with no
readers; see pipe(7)
SIGALRM 14 Term Timer signal from alarm(2)
SIGTERM 15 Term Termination signal
SIGUSR1 30,10,16 Term User-defined signal 1
SIGUSR2 31,12,17 Term User-defined signal 2
SIGCHLD 20,17,18 Ign Child stopped or terminated
SIGCONT 19,18,25 Cont Continue if stopped
SIGSTOP 17,19,23 Stop Stop process, cannot be caught, blocked or ignored
SIGTSTP 18,20,24 Stop Stop typed at terminal
SIGTTIN 21,21,26 Stop Terminal input for background process
SIGTTOU 22,22,27 Stop Terminal output for background process
Next the signals not in the POSIX.1-1990 standard but described in SUSv2 and POSIX.1-2001.
Signal Value Action Comment
────────────────────────────────────────────────────────────────────
SIGBUS 10,7,10 Core Bus error (bad memory access)
SIGPOLL Term Pollable event (Sys V).
Synonym for SIGIO
SIGPROF 27,27,29 Term Profiling timer expired
SIGSYS 12,31,12 Core Bad system call (SVr4);
see also seccomp(2)
SIGTRAP 5 Core Trace/breakpoint trap
SIGURG 16,23,21 Ign Urgent condition on socket (4.2BSD)
SIGVTALRM 26,26,28 Term Virtual alarm clock (4.2BSD)
SIGXCPU 24,24,30 Core CPU time limit exceeded (4.2BSD);
see setrlimit(2)
SIGXFSZ 25,25,31 Core File size limit exceeded (4.2BSD);
see setrlimit(2)
Up to and including Linux 2.2, the default behavior for SIGSYS, SIGXCPU, SIGXFSZ, and (on architectures other than SPARC and MIPS) SIGBUS was to terminate the process (without a core dump). (On some other UNIX systems the
default action for SIGXCPU and SIGXFSZ is to terminate the process without a core dump.) Linux 2.4 conforms to the POSIX.1-2001 requirements for these signals, terminating the process with a core dump.
Next various other signals.
Signal Value Action Comment
────────────────────────────────────────────────────────────────────
SIGIOT 6 Core IOT trap. A synonym for SIGABRT
SIGEMT 7,-,7 Term Emulator trap
SIGSTKFLT -,16,- Term Stack fault on coprocessor (unused)
SIGIO 23,29,22 Term I/O now possible (4.2BSD)
SIGCLD -,-,18 Ign A synonym for SIGCHLD
SIGPWR 29,30,19 Term Power failure (System V)
SIGINFO 29,-,- A synonym for SIGPWR
SIGLOST -,-,- Term File lock lost (unused)
SIGWINCH 28,28,20 Ign Window resize signal (4.3BSD, Sun)
SIGUNUSED -,31,- Core Synonymous with SIGSYS
(Signal 29 is SIGINFO / SIGPWR on an alpha but SIGLOST on a sparc.)
SIGEMT is not specified in POSIX.1-2001, but nevertheless appears on most other UNIX systems, where its default action is typically to terminate the process with a core dump.
SIGPWR (which is not specified in POSIX.1-2001) is typically ignored by default on those other UNIX systems where it appears.
SIGIO (which is not specified in POSIX.1-2001) is ignored by default on several other UNIX systems.
Where defined, SIGUNUSED is synonymous with SIGSYS on most architectures.
Linux error codes
From include/uapi/asm-generic/errno-base.h, include/uapi/asm-generic/errno.h, and include/linux/errno.h in the Linux 4.19 kernel.
Definition |
Value |
Description |
EPERM | 1 | Operation not permitted |
ENOENT | 2 | No such file or directory |
ESRCH | 3 | No such process |
EINTR | 4 | Interrupted system call |
EIO | 5 | I/O error |
ENXIO | 6 | No such device or address |
E2BIG | 7 | Argument list too long |
ENOEXEC | 8 | Exec format error |
EBADF | 9 | Bad file number |
ECHILD | 10 | No child processes |
EAGAIN | 11 | Try again |
ENOMEM | 12 | Out of memory |
EACCES | 13 | Permission denied |
EFAULT | 14 | Bad address |
ENOTBLK | 15 | Block device required |
EBUSY | 16 | Device or resource busy |
EEXIST | 17 | File exists |
EXDEV | 18 | Cross-device link |
ENODEV | 19 | No such device |
ENOTDIR | 20 | Not a directory |
EISDIR | 21 | Is a directory |
EINVAL | 22 | Invalid argument |
ENFILE | 23 | File table overflow |
EMFILE | 24 | Too many open files |
ENOTTY | 25 | Not a typewriter |
ETXTBSY | 26 | Text file busy |
EFBIG | 27 | File too large |
ENOSPC | 28 | No space left on device |
ESPIPE | 29 | Illegal seek |
EROFS | 30 | Read-only file system |
EMLINK | 31 | Too many links |
EPIPE | 32 | Broken pipe |
EDOM | 33 | Math argument out of domain of func |
ERANGE | 34 | Math result not representable |
EDEADLK | 35 | Resource deadlock would occur |
ENAMETOOLONG | 36 | File name too long |
ENOLCK | 37 | No record locks available |
ENOSYS | 38 | Invalid system call number |
ENOTEMPTY | 39 | Directory not empty |
ELOOP | 40 | Too many symbolic links encountered |
EWOULDBLOCK | EAGAIN | Operation would block |
ENOMSG | 42 | No message of desired type |
EIDRM | 43 | Identifier removed |
ECHRNG | 44 | Channel number out of range |
EL2NSYNC | 45 | Level 2 not synchronized |
EL3HLT | 46 | Level 3 halted |
EL3RST | 47 | Level 3 reset |
ELNRNG | 48 | Link number out of range |
EUNATCH | 49 | Protocol driver not attached |
ENOCSI | 50 | No CSI structure available |
EL2HLT | 51 | Level 2 halted |
EBADE | 52 | Invalid exchange |
EBADR | 53 | Invalid request descriptor |
EXFULL | 54 | Exchange full |
ENOANO | 55 | No anode |
EBADRQC | 56 | Invalid request code |
EBADSLT | 57 | Invalid slot |
EDEADLOCK | EDEADLK | |
EBFONT | 59 | Bad font file format |
ENOSTR | 60 | Device not a stream |
ENODATA | 61 | No data available |
ETIME | 62 | Timer expired |
ENOSR | 63 | Out of streams resources |
ENONET | 64 | Machine is not on the network |
ENOPKG | 65 | Package not installed |
EREMOTE | 66 | Object is remote |
ENOLINK | 67 | Link has been severed |
EADV | 68 | Advertise error |
ESRMNT | 69 | Srmount error |
ECOMM | 70 | Communication error on send |
EPROTO | 71 | Protocol error |
EMULTIHOP | 72 | Multihop attempted |
EDOTDOT | 73 | RFS specific error |
EBADMSG | 74 | Not a data message |
EOVERFLOW | 75 | Value too large for defined data type |
ENOTUNIQ | 76 | Name not unique on network |
EBADFD | 77 | File descriptor in bad state |
EREMCHG | 78 | Remote address changed |
ELIBACC | 79 | Can not access a needed shared library |
ELIBBAD | 80 | Accessing a corrupted shared library |
ELIBSCN | 81 | .lib section in a.out corrupted |
ELIBMAX | 82 | Attempting to link in too many shared libraries |
ELIBEXEC | 83 | Cannot exec a shared library directly |
EILSEQ | 84 | Illegal byte sequence |
ERESTART | 85 | Interrupted system call should be restarted |
ESTRPIPE | 86 | Streams pipe error |
EUSERS | 87 | Too many users |
ENOTSOCK | 88 | Socket operation on non-socket |
EDESTADDRREQ | 89 | Destination address required |
EMSGSIZE | 90 | Message too long |
EPROTOTYPE | 91 | Protocol wrong type for socket |
ENOPROTOOPT | 92 | Protocol not available |
EPROTONOSUPPORT | 93 | Protocol not supported |
ESOCKTNOSUPPORT | 94 | Socket type not supported |
EOPNOTSUPP | 95 | Operation not supported on transport endpoint |
EPFNOSUPPORT | 96 | Protocol family not supported |
EAFNOSUPPORT | 97 | Address family not supported by protocol |
EADDRINUSE | 98 | Address already in use |
EADDRNOTAVAIL | 99 | Cannot assign requested address |
ENETDOWN | 100 | Network is down |
ENETUNREACH | 101 | Network is unreachable |
ENETRESET | 102 | Network dropped connection because of reset |
ECONNABORTED | 103 | Software caused connection abort |
ECONNRESET | 104 | Connection reset by peer |
ENOBUFS | 105 | No buffer space available |
EISCONN | 106 | Transport endpoint is already connected |
ENOTCONN | 107 | Transport endpoint is not connected |
ESHUTDOWN | 108 | Cannot send after transport endpoint shutdown |
ETOOMANYREFS | 109 | Too many references: cannot splice |
ETIMEDOUT | 110 | Connection timed out |
ECONNREFUSED | 111 | Connection refused |
EHOSTDOWN | 112 | Host is down |
EHOSTUNREACH | 113 | No route to host |
EALREADY | 114 | Operation already in progress |
EINPROGRESS | 115 | Operation now in progress |
ESTALE | 116 | Stale file handle |
EUCLEAN | 117 | Structure needs cleaning |
ENOTNAM | 118 | Not a XENIX named type file |
ENAVAIL | 119 | No XENIX semaphores available |
EISNAM | 120 | Is a named type file |
EREMOTEIO | 121 | Remote I/O error |
EDQUOT | 122 | Quota exceeded |
ENOMEDIUM | 123 | No medium found |
EMEDIUMTYPE | 124 | Wrong medium type |
ECANCELED | 125 | Operation Canceled |
ENOKEY | 126 | Required key not available |
EKEYEXPIRED | 127 | Key has expired |
EKEYREVOKED | 128 | Key has been revoked |
EKEYREJECTED | 129 | Key was rejected by service |
EOWNERDEAD | 130 | Owner died |
ENOTRECOVERABLE | 131 | State not recoverable |
ERFKILL | 132 | Operation not possible due to RF-kill |
EHWPOISON | 133 | Memory page has hardware error |
ERESTARTSYS | 512 | |
ERESTARTNOINTR | 513 | |
ERESTARTNOHAND | 514 | restart if no handler.. |
ENOIOCTLCMD | 515 | No ioctl command |
EOPENSTALE | 518 | open found a stale dentry |
EBADHANDLE | 521 | Illegal NFS file handle |
ENOTSYNC | 522 | Update synchronization mismatch |
EBADCOOKIE | 523 | Cookie is stale |
ENOTSUPP | 524 | Operation is not supported |
ETOOSMALL | 525 | Buffer or request is too small |
ESERVERFAULT | 526 | An untranslatable error occurred |
EBADTYPE | 527 | Type not supported by server |
EJUKEBOX | 528 | Request initiated, but will not complete before timeout |
EIOCBQUEUED | 529 | iocb queued, will get completion event |
ERECALLCONFLICT | 530 | conflict with recalled state |