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top(1): use more modern signal code

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Rather than manually build signal masks use functions designed for that
reason. Also use sigprocmask instead of sigblock.
This commit is contained in:
Eitan Adler 2018-06-18 02:06:16 +00:00
parent 755e4b7936
commit 6bb0d5cf77
1 changed files with 8 additions and 7 deletions
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15
usr.bin/top/top.c
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@ -50,10 +50,6 @@ typedef void sigret_t;
/* The buffer that stdio will use */
static char stdoutbuf[Buffersize];
/* build Signal masks */
#define Smask(s) (1 << ((s) - 1))
static int fmt_flags = 0;
int pcpu_stats = false;
@ -233,7 +229,7 @@ main(int argc, char *argv[])
static char tempbuf1[50];
static char tempbuf2[50];
int old_sigmask; /* only used for BSD-style signals */
sigset_t old_sigmask, new_sigmask;
int topn = Infinity;
double delay = 2;
int displays = 0; /* indicates unspecified */
@ -591,13 +587,18 @@ main(int argc, char *argv[])
}
/* hold interrupt signals while setting up the screen and the handlers */
old_sigmask = sigblock(Smask(SIGINT) | Smask(SIGQUIT) | Smask(SIGTSTP));
sigemptyset(&new_sigmask);
sigaddset(&new_sigmask, SIGINT);
sigaddset(&new_sigmask, SIGQUIT);
sigaddset(&new_sigmask, SIGTSTP);
sigprocmask(SIG_BLOCK, &new_sigmask, &old_sigmask);
init_screen();
signal(SIGINT, leave);
signal(SIGQUIT, leave);
signal(SIGTSTP, tstop);
signal(SIGWINCH, top_winch);
sigsetmask(old_sigmask);
sigprocmask(SIG_SETMASK, &old_sigmask, NULL);
if (warnings)
{
fputs("....", stderr);