strsignal(3p) [posix man page]

STRSIGNAL(3P)						     POSIX Programmer's Manual						     STRSIGNAL(3P)

PROLOG

       This  manual page is part of the POSIX Programmer's Manual.  The Linux implementation of this interface may differ (consult the correspond-
       ing Linux manual page for details of Linux behavior), or the interface may not be implemented on Linux.

NAME

       strsignal -- get name of signal

SYNOPSIS

       #include <string.h>

       char *strsignal(int signum);

DESCRIPTION

       The strsignal() function shall map the signal number in signum to an implementation-defined string and shall return a pointer  to  it.	It
       shall use the same set of messages as the psignal() function.

       The  application shall not modify the string returned. The returned pointer might be invalidated or the string content might be overwritten
       by a subsequent call to strsignal() or setlocale().

       The contents of the message strings returned by strsignal() should be determined by the setting of the LC_MESSAGES category in the  current
       locale.

       The implementation shall behave as if no function defined in this standard calls strsignal().

       Since  no  return  value is reserved to indicate an error, an application wishing to check for error situations should set errno to 0, then
       call strsignal(), then check errno.

       The strsignal() function need not be thread-safe.

RETURN VALUE

       Upon successful completion, strsignal() shall return a pointer to a string. Otherwise, if signum is not a valid signal number,  the  return
       value is unspecified.

ERRORS

       No errors are defined.

       The following sections are informative.

EXAMPLES

       None.

APPLICATION USAGE

       None.

RATIONALE

       If  signum is not a valid signal number, some implementations return NULL, while for others the strsignal() function returns a pointer to a
       string containing an unspecified message denoting an unknown signal. POSIX.1-2008 leaves this return value unspecified.

FUTURE DIRECTIONS

       None.

SEE ALSO

       psiginfo(), setlocale()

       The Base Definitions volume of POSIX.1-2008, <string.h>

COPYRIGHT

       Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1, 2013 Edition, Standard for Information Technol-
       ogy  --	Portable  Operating  System  Interface (POSIX), The Open Group Base Specifications Issue 7, Copyright (C) 2013 by the Institute of
       Electrical and Electronics Engineers, Inc and The Open Group.  (This is POSIX.1-2008 with the 2013 Technical Corrigendum 1 applied.) In the
       event of any discrepancy between this version and the original IEEE and The Open Group Standard, the original IEEE and The Open Group Stan-
       dard is the referee document. The original Standard can be obtained online at http://www.unix.org/online.html .

       Any typographical or formatting errors that appear in this page are most likely to have been introduced during the conversion of the source
       files to man page format. To report such errors, see https://www.kernel.org/doc/man-pages/reporting_bugs.html .

IEEE
/The Open Group						       2013							     STRSIGNAL(3P)

PSIGINFO(3P)						     POSIX Programmer's Manual						      PSIGINFO(3P)

PROLOG

       This  manual page is part of the POSIX Programmer's Manual.  The Linux implementation of this interface may differ (consult the correspond-
       ing Linux manual page for details of Linux behavior), or the interface may not be implemented on Linux.

NAME

       psiginfo, psignal -- print signal information to standard error

SYNOPSIS

       #include <signal.h>

       void psiginfo(const siginfo_t *pinfo, const char *message);
       void psignal(int signum, const char *message);

DESCRIPTION

       The psiginfo() and psignal() functions shall print a message out on stderr associated with a signal number. If message is not null  and	is
       not  the empty string, then the string pointed to by the message argument shall be printed first, followed by a <colon>, a <space>, and the
       signal description string indicated by signum, or by the signal associated with pinfo.  If the message argument is null	or  points  to	an
       empty string, then only the signal description shall be printed. For psiginfo(), the argument pinfo references a valid siginfo_t structure.
       For psignal(), if signum is not a valid signal number, the behavior is implementation-defined.

       The psiginfo() and psignal() functions shall not change the orientation of the standard error stream.

       The psiginfo() and psignal() functions shall mark for update the last data modification and last file status change timestamps of the  file
       associated  with  the  standard	error  stream  at  some time between their successful completion and exit(), abort(), or the completion of
       fflush() or fclose() on stderr.

       The psiginfo() and psignal() functions shall not change the setting of errno if successful.

       On error, the psiginfo() and psignal() functions shall set the error indicator for the stream to which stderr points, and shall	set  errno
       to indicate the error.

       Since  no value is returned, an application wishing to check for error situations should set errno to 0, then call psiginfo() or psignal(),
       then check errno.

RETURN VALUE

       These functions shall not return a value.

ERRORS

       Refer to fputc().

       The following sections are informative.

EXAMPLES

       None.

APPLICATION USAGE

       As an alternative to setting errno to zero before the call and checking if it is non-zero afterwards,  applications  can  use  ferror()	to
       detect whether psiginfo() or psignal() encountered an error.

       An  application	wishing  to  use this method to check for error situations should call clearerr(stderr) before calling psiginfo() or psig-
       nal(), then if ferror(stderr) returns non-zero, the value of errno indicates which error occurred.

RATIONALE

       System V historically has psignal() and psiginfo() in <siginfo.h>.  However, the <siginfo.h> header is not specified in	the  Base  Defini-
       tions volume of POSIX.1-2008, and the type siginfo_t is defined in <signal.h>.

FUTURE DIRECTIONS

       None.

SEE ALSO

       fputc(), perror(), strsignal()

       The Base Definitions volume of POSIX.1-2008, <signal.h>

COPYRIGHT

       Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1, 2013 Edition, Standard for Information Technol-
       ogy -- Portable Operating System Interface (POSIX), The Open Group Base Specifications Issue 7, Copyright (C)  2013  by	the  Institute	of
       Electrical and Electronics Engineers, Inc and The Open Group.  (This is POSIX.1-2008 with the 2013 Technical Corrigendum 1 applied.) In the
       event of any discrepancy between this version and the original IEEE and The Open Group Standard, the original IEEE and The Open Group Stan-
       dard is the referee document. The original Standard can be obtained online at http://www.unix.org/online.html .

       Any typographical or formatting errors that appear in this page are most likely to have been introduced during the conversion of the source
       files to man page format. To report such errors, see https://www.kernel.org/doc/man-pages/reporting_bugs.html .

IEEE
/The Open Group						       2013							      PSIGINFO(3P)