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Author: Jan Christoph Nordholz <hesso@pool.math.tu-berlin.de>
Description: Add lookup code for the creation time of each session.
Requires digging in /proc/$pid and /proc/uptime, though, so it's
definitely no candidate for the Beautiful C contest.
.
Affects screen's behaviour in the following situations:
.
* 'screen -ls' lists available sessions sorted chronologically
* 'screen -RR' now picks the youngest session instead of an
arbitrary one
.
Patch 2/3: new utility functions
Bug-Debian: https://bugs.debian.org/206572
Forwarded: not-yet
--- a/extern.h
+++ b/extern.h
@@ -395,6 +395,8 @@
#else
extern int xsnprintf __P(());
#endif
+extern time_t SessionCreationTime __P((const char *));
+extern time_t GetUptime __P((void));
/* acl.c */
--- a/misc.c
+++ b/misc.c
@@ -30,6 +30,7 @@
#include <sys/types.h>
#include <sys/stat.h> /* mkdir() declaration */
#include <signal.h>
+#include <fcntl.h>
#include "config.h"
#include "screen.h"
@@ -720,3 +721,40 @@
}
#endif
+
+time_t SessionCreationTime(const char *fifo) {
+ char ppath[20];
+ int pfd;
+ char pdata[512];
+ char *jiffies;
+
+ int pid = atoi(fifo);
+ if (pid <= 0) return 0;
+ sprintf(ppath, "/proc/%u/stat", pid);
+ pfd = open(ppath, O_RDONLY);
+ if (pfd < 0) return 0;
+ while (1) {
+ int R=0, RR;
+ RR = read(pfd, pdata + R, 512-R);
+ if (RR < 0) {close(pfd); return 0;}
+ else if (RR == 0) break;
+ }
+ close(pfd);
+
+ for (pfd=21, jiffies=pdata; pfd; --pfd) {
+ jiffies = strchr(jiffies, ' ');
+ if (!jiffies) break; else ++jiffies;
+ }
+ if (!jiffies) return 0;
+
+ return atol(jiffies) / 100;
+}
+
+time_t GetUptime(void) {
+ char uptimestr[32];
+ int fd = open("/proc/uptime", O_RDONLY);
+ if (fd < 0) return 0;
+ (void)read(fd, uptimestr, 32);
+ close(fd);
+ return atol(uptimestr);
+}
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