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psignal(3) [osx man page]

PSIGNAL(3)						   BSD Library Functions Manual 						PSIGNAL(3)

NAME
psignal, strsignal, sys_siglist, sys_signame -- system signal messages LIBRARY
Standard C Library (libc, -lc) SYNOPSIS
#include <signal.h> void psignal(unsigned sig, const char *s); extern const char * const sys_siglist[]; extern const char * const sys_signame[]; #include <string.h> char * strsignal(int sig); DESCRIPTION
The psignal() and strsignal() functions locate the descriptive message string for a signal number. The strsignal() function accepts a signal number argument sig and returns a pointer to the corresponding message string. The psignal() function accepts a signal number argument sig and writes it to the standard error. If the argument s is non-NULL and does not point to the null character, s is written to the standard error file descriptor prior to the message string, immediately followed by a colon and a space. If the signal number is not recognized (sigaction(2)), the string ``Unknown signal'' is produced. The message strings can be accessed directly through the external array sys_siglist, indexed by recognized signal numbers. The external array sys_signame is used similarly and contains short, lower-case abbreviations for signals which are useful for recognizing signal names in user input. The defined variable NSIG contains a count of the strings in sys_siglist and sys_signame. RETURN VALUES
strsignal() a pointer to the desired message or a NULL value indicating an error. This string is not to be freed by the caller. Beginning with Mac OSX 10.7, this string is unique to each thread. ERRORS
strsignal() will fail and no additional memory will be allocated if one of the following are true: [ENOMEM] There was insufficient memory to allocate storage space for the return value in the running thread. SEE ALSO
sigaction(2), perror(3), strerror(3) HISTORY
The psignal() function appeared in 4.2BSD. BSD
February 27, 1995 BSD

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PSIGNAL(3)						     Linux Programmer's Manual							PSIGNAL(3)

NAME
psignal, psiginfo - print signal message SYNOPSIS
#include <signal.h> void psignal(int sig, const char *s); void psiginfo(const siginfo_t *pinfo, const char *s); extern const char *const sys_siglist[]; Feature Test Macro Requirements for glibc (see feature_test_macros(7)): psignal(): _SVID_SOURCE || _BSD_SOURCE psiginfo(): _XOPEN_SOURCE >= 700 || _POSIX_C_SOURCE >= 200809L sys_siglist: _BSD_SOURCE 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 information about the signal described by pinfo, which should point to a valid siginfo_t structure. As well as the signal description, psiginfo() 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)). The array sys_siglist holds the signal description strings indexed by signal number. RETURN VALUE
The psignal() and psiginfo() functions return no value. VERSIONS
The psiginfo() function was added to glibc in version 2.10. CONFORMING TO
POSIX.1-2008, 4.3BSD. BUGS
In glibc versions up to 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) COLOPHON
This page is part of release 3.44 of the Linux man-pages project. A description of the project, and information about reporting bugs, can be found at http://www.kernel.org/doc/man-pages/. GNU
2010-10-06 PSIGNAL(3)

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