DragonFly On-Line Manual Pages

PSIGNAL(3)            DragonFly Library Functions Manual            PSIGNAL(3)

NAME
     psignal, psiginfo, strsignal, sys_siglist, sys_signame, sys_nsig - system
     signal messages

LIBRARY
     Standard C Library (libc, -lc)

SYNOPSIS
     #include <signal.h>

     void
     psignal(int sig, const char *s);

     void
     psiginfo(const siginfo_t *si, const char *s);

     extern const char * const sys_siglist[];
     extern const char * const sys_signame[];
     extern const int sys_nsig;

     #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 psiginfo() function is similar to psignal(), except that the signal
     number information is taken from the si argument which is a siginfo_t
     structure.

     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 external variable sys_nsig contains a count of the
     strings in sys_siglist and sys_signame.  Note that the defined variable
     NSIG will typically be the same as sys_nsig, but might be different due
     to newer or older kernels and newer or older libc libraries.  For maximum
     portability you must use sys_nsig to limit-check the above arrays.
     Additionally, you should check for NULL array entries and generate a
     generic signal name in those cases.

SEE ALSO
     sigaction(2), perror(3), strerror(3)

HISTORY
     The psignal() function appeared in 4.2BSD.  The psiginfo() function
     appeared in DragonFly 4.1.

DragonFly 5.7-DEVELOPMENT     September 12, 2019     DragonFly 5.7-DEVELOPMENT