DragonFly On-Line Manual Pages

Search: Section:  

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


psignal, psiginfo, strsignal, sys_siglist, sys_signame, sys_nsig -- sys- tem signal messages


Standard C Library (libc, -lc)


#include <signal.h> void psignal(unsigned 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);


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 abbrevia- tions 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.


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


The psignal() function appeared in 4.2BSD. The psiginfo() function appeared in DragonFly 4.1. DragonFly 4.7 January 2, 2015 DragonFly 4.7

Search: Section: