1PSIGINFO(3P) POSIX Programmer's Manual PSIGINFO(3P)
2
6 This manual page is part of the POSIX Programmer's Manual. The Linux
7 implementation of this interface may differ (consult the corresponding
8 Linux manual page for details of Linux behavior), or the interface may
9 not be implemented on Linux.
10
12 psiginfo, psignal — write signal information to standard error
13
15 #include <signal.h>
16 void psiginfo(const siginfo_t *pinfo, const char *message);
18 void psignal(int signum, const char *message);
19
21 The psiginfo() and psignal() functions shall write a language-dependent
22 message associated with a signal number to the standard error stream as
23 follows:
24 * First, if message is not a null pointer and is not the empty
26 string, the string pointed to by the message argument shall be
27 written, followed by a <colon> and a <space>.
28 * Then the signal description string associated with signum or with
30 the signal indicated by pinfo shall be written, followed by a <new‐
31 line>.
32 For psiginfo(), the application shall ensure that the argument pinfo
34 references a valid siginfo_t structure. For psignal(), if signum is not
35 a valid signal number, the behavior is implementation-defined.
36 The psiginfo() and psignal() functions shall not change the orientation
38 of the standard error stream.
39 The psiginfo() and psignal() functions shall mark for update the last
41 data modification and last file status change timestamps of the file
42 associated with the standard error stream at some time between their
43 successful completion and exit(), abort(), or the completion of
44 fflush() or fclose() on stderr.
45 The psiginfo() and psignal() functions shall not change the setting of
47 errno if successful.
48 On error, the psiginfo() and psignal() functions shall set the error
50 indicator for the stream to which stderr points, and shall set errno to
51 indicate the error.
52 Since no value is returned, an application wishing to check for error
54 situations should set errno to 0, then call psiginfo() or psignal(),
55 then check errno.
56
58 These functions shall not return a value.
59
61 Refer to fputc().
62 The following sections are informative.
64
66 None.
67
69 As an alternative to setting errno to zero before the call and checking
70 if it is non-zero afterwards, applications can use ferror() to detect
71 whether psiginfo() or psignal() encountered an error.
72 An application wishing to use this method to check for error situations
74 should call clearerr(stderr) before calling psiginfo() or psignal(),
75 then if ferror(stderr) returns non-zero, the value of errno indicates
76 which error occurred.
77
79 System V historically has psignal() and psiginfo() in <siginfo.h>.
80 However, the <siginfo.h> header is not specified in the Base Defini‐
81 tions volume of POSIX.1‐2017, and the type siginfo_t is defined in
82 <signal.h>.
83
85 None.
86
88 fputc(), perror(), strsignal()
89 The Base Definitions volume of POSIX.1‐2017, <signal.h>
91
93 Portions of this text are reprinted and reproduced in electronic form
94 from IEEE Std 1003.1-2017, Standard for Information Technology -- Por‐
95 table Operating System Interface (POSIX), The Open Group Base Specifi‐
96 cations Issue 7, 2018 Edition, Copyright (C) 2018 by the Institute of
97 Electrical and Electronics Engineers, Inc and The Open Group. In the
98 event of any discrepancy between this version and the original IEEE and
99 The Open Group Standard, the original IEEE and The Open Group Standard
100 is the referee document. The original Standard can be obtained online
101 at http://www.opengroup.org/unix/online.html .
102 Any typographical or formatting errors that appear in this page are
104 most likely to have been introduced during the conversion of the source
105 files to man page format. To report such errors, see https://www.ker‐
106 nel.org/doc/man-pages/reporting_bugs.html .
107IEEE/The Open Group 2017 PSIGINFO(3P)