psignal(3) Library Functions Manual psignal(3)
NAME
psignal, psiginfo - print signal description
LIBRARY
Standard C library (libc, -lc)
SYNOPSIS
#include <signal.h>
void psignal(int sig, const char *s);
void psiginfo(const siginfo_t *pinfo, const char *s);
Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
psignal():
Since glibc 2.19:
_DEFAULT_SOURCE
glibc 2.19 and earlier:
_BSD_SOURCE || _SVID_SOURCE
psiginfo():
_POSIX_C_SOURCE >= 200809L
DESCRIPTION
The psignal() function displays a message on stderr consisting of the
string s, a colon, a space, a string describing the signal number sig,
and a trailing newline. If the string s is NULL or empty, the colon
and space are omitted. If sig is invalid, the message displayed will
indicate an unknown signal.
The psiginfo() function is like psignal(), except that it displays in-
formation about the signal described by pinfo, which should point to a
valid siginfo_t structure. As well as the signal description, psig-
info() displays information about the origin of the signal, and other
information relevant to the signal (e.g., the relevant memory address
for hardware-generated signals, the child process ID for SIGCHLD, and
the user ID and process ID of the sender, for signals set using kill(2)
or sigqueue(3)).
RETURN VALUE
The psignal() and psiginfo() functions return no value.
VERSIONS
The psiginfo() function was added in glibc 2.10.
ATTRIBUTES
For an explanation of the terms used in this section, see at-
tributes(7).
┌─────────────────────────────────────┬───────────────┬────────────────┐
│Interface │ Attribute │ Value │
├─────────────────────────────────────┼───────────────┼────────────────┤
│psignal(), psiginfo() │ Thread safety │ MT-Safe locale │
└─────────────────────────────────────┴───────────────┴────────────────┘
STANDARDS
POSIX.1-2008, 4.3BSD.
BUGS
Up to glibc 2.12, psiginfo() had the following bugs:
• In some circumstances, a trailing newline is not printed.
• Additional details are not displayed for real-time signals.
SEE ALSO
sigaction(2), perror(3), strsignal(3), signal(7)
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