записать информацию о сигнале в стандартную ошибку (write signal information to standard error)
Пролог (Prolog)
This manual page is part of the POSIX Programmer's Manual. The
Linux implementation of this interface may differ (consult the
corresponding Linux manual page for details of Linux behavior),
or the interface may not be implemented on Linux.
Имя (Name)
psiginfo, psignal — write signal information to standard error
Синопсис (Synopsis)
#include <signal.h>
void psiginfo(const siginfo_t *pinfo, const char *message);
void psignal(int signum, const char *message);
Описание (Description)
The psiginfo() and psignal() functions shall write a language-
dependent message associated with a signal number to the standard
error stream as follows:
* First, if message is not a null pointer and is not the empty
string, the string pointed to by the message argument shall
be written, followed by a <colon> and a <space>.
* Then the signal description string associated with signum or
with the signal indicated by pinfo shall be written, followed
by a <newline>.
For psiginfo(), the application shall ensure that 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.
Возвращаемое значение (Return value)
These functions shall not return a value.
Ошибки (Error)
Refer to fputc(3p).
The following sections are informative.
Примеры (Examples)
None.
Использование в приложениях (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 psignal(), then if ferror(stderr) returns non-zero, the value
of errno indicates which error occurred.
Обоснование (Rationale)
System V historically has psignal() and psiginfo() in
<siginfo.h>. However, the <siginfo.h> header is not specified in
the Base Definitions volume of POSIX.1‐2017, and the type
siginfo_t is defined in <signal.h>.
Будущие направления (Future directions)
None.
Смотри также (See also)
fputc(3p), perror(3p), strsignal(3p)
The Base Definitions volume of POSIX.1‐2017, signal.h(0p)
