Mastering Linux Kernel Development

Signal-management APIs

Applications are provided with various APIs for managing signals; we shall take a look at few of the important ones:

1. Sigaction(): User-mode processes use the POSIX API sigaction() to examine or change the disposition of a signal. This API provides a variety of attribute flags that can further define the behavior of a signal:

 #include <signal.h> int sigaction(int signum, const struct sigaction *act, struct sigaction *oldact); The sigaction structure is defined as something like: struct sigaction { void (*sa_handler)(int); void (*sa_sigaction)(int, siginfo_t *, void *); sigset_t sa_mask; int sa_flags; void (*sa_restorer)(void); };

• int signum is the identifier number of a recognized signal. sigaction() examines and ...