NAME

raise - send a signal to the executing process

SYNOPSIS

#include <signal.h>

int raise(int sig);


DESCRIPTION

^[CX] The functionality described on this reference page is aligned with the ISO C standard. Any conflict between the requirements described here and the ISO C standard is unintentional. This volume of IEEE Std 1003.1-2001 defers to the ISO C standard.

The raise() function shall send the signal sig to the executing ^[CX]  thread or process. If a signal handler is called, the raise() function shall not return until after the signal handler does.

^[THR] If the implementation supports the Threads option, the effect of the raise() function shall be equivalent to calling:

pthread_kill(pthread_self(), sig);

^[CX] Otherwise, the effect of the raise() function shall be equivalent to calling:

kill(getpid(), sig);

RETURN VALUE

Upon successful completion, 0 shall be returned. Otherwise, a non-zero value shall be returned ^[CX]  and errno shall be set to indicate the error.

ERRORS

The raise() function shall fail if:

[EINVAL]

^[CX] The value of the sig argument is an invalid signal number.

EXAMPLES

None.

APPLICATION USAGE

None.

RATIONALE

The term "thread" is an extension to the ISO C standard.

FUTURE DIRECTIONS

None.

SEE ALSO

kill(), sigaction(), the Base Definitions volume of IEEE Std 1003.1-2001, <signal.h>, <sys/types.h>

CHANGE HISTORY

First released in Issue 4. Derived from the ANSI C standard.

Issue 5

The DESCRIPTION is updated for alignment with the POSIX Threads Extension.

Issue 6

Extensions beyond the ISO C standard are marked.

The following new requirements on POSIX implementations derive from alignment with the Single UNIX Specification:

• In the RETURN VALUE section, the requirement to set errno on error is added.

• The [EINVAL] error condition is added.