SIGSYS
From Wikipedia, the free encyclopedia
| Description: | Bad argument to routine (SVID) |
|---|---|
| Default action: | Abnormal termination of the process |
| SA_SIGINFO macros | |
| None | |
On POSIX-compliant platforms, SIGSYS is the signal thrown by computer programs when a bad argument is passed to a system call. The symbolic constant for SIGSYS is defined in the header file signal.h. Symbolic signal names are used because signal numbers can vary across platforms.
[edit] Etymology
SIG is a common prefix for signal names. SYS refers to a system call.
[edit] Usage
Theoretically, in POSIX SIGSYS may be sent when a process supplies an incorrect argument to a system call. In practice, conforming implementations return ENOSYS if a code number does not correspond to a system call, or another error if a later argument is invalid (e.g. EBADF if a file descriptor does not exist). POSIX.1 has this to say about SIGSYS:
- There is very little that a conforming POSIX.1 application can do by catching, ignoring or masking ... SIGSYS. ...
- One portable use that does exist ... is that a command interpreter can recognize them as the cause of a process's termination.
[edit] See also
| POSIX Signals |
| SIGABRT | SIGALRM | SIGFPE | SIGHUP | SIGILL | SIGINT | SIGKILL | SIGPIPE | SIGQUIT | SIGSEGV | SIGTERM | SIGUSR1 | SIGUSR2 | SIGCHLD | SIGCONT | SIGSTOP | SIGTSTP | SIGTTIN | SIGTTOU | SIGBUS | SIGPOLL | SIGPROF | SIGSYS | SIGTRAP | SIGURG | SIGVTALRM | SIGXCPU | SIGXFSZ | Realtime Signals are user definable—SIGRTMIN+n through SIGRTMAX. |
| Common non-POSIX signals and synonyms |
| SIGIOT | SIGEMT | SIGSTKFLT | SIGIO | SIGCLD | SIGINFO | SIGPWR (SIGINFO) | SIGLOST | SIGWINCH | SIGUNUSED |
