/* pgrep.c - pgrep and pkill implementation * * Copyright 2012 Madhur Verma <mad.flexi@gmail.com> * Copyright 2013 Kyungwan Han <asura321@gmail.com> * USE_PGREP(NEWTOY(pgrep, "?P# s# xvonlf[!sP]", TOYFLAG_USR|TOYFLAG_BIN)) USE_PGREP(OLDTOY(pkill, pgrep, OPTSTR_pgrep, TOYFLAG_USR|TOYFLAG_BIN)) config PGREP bool "pgrep" default n help usage: pgrep [-flnovx] [-s SID|-P PPID|PATTERN] pkill [-l|-SIGNAL] [-fnovx] [-s SID|-P PPID|PATTERN] -l Show command name too / List all signals -f Match against entire command line -n Show/Signal the newest process only -o Show/Signal the oldest process only -v Negate the match -x Match whole name (not substring) -s Match session ID (0 for current) -P Match parent process ID */ #define FOR_pgrep #include "toys.h" #include <regex.h> #define flag_get(f,v,d) ((toys.optflags & f) ? v : d) #define flag_chk(f) ((toys.optflags & f) ? 1 : 0) GLOBALS( long sid; //-s long ppid; //-P char *signame; ) static int exec_action(unsigned pid, char *name, int signal) { if (toys.which->name[1] == 'g') { printf("%d", pid); if (flag_chk(FLAG_l)) printf(" %s", name); printf("\n"); } else { kill(pid, signal); } return 0; } static int regex_match(regex_t *rp, char *tar, char *patt) { regmatch_t rm[1]; int len = strlen(tar); if (regexec(rp, tar, 1, rm, 0) == 0) { if (flag_chk(FLAG_x)) { if ((rm[0].rm_so == 0) && ((rm[0].rm_eo - rm[0].rm_so) == len)) return 1; } else return 1; } return 0; } void pgrep_main(void) { int signum=0, eval=0, ret=1; DIR *dp=NULL; struct dirent *entry=NULL; regex_t rp; unsigned pid=0, ppid=0, sid=0, latest_pid=0; char *cmdline=NULL, *latest_cmdline = NULL; pid_t self = getpid(); if (!(dp = opendir("/proc"))) perror_exit("OPENDIR: failed to open /proc"); setlinebuf(stdout); if (toys.which->name[1] == 'k') { if (flag_chk(FLAG_l)) { sig_to_num(NULL); return; } if (!TT.signame && *toys.optargs && **toys.optargs == '-') { TT.signame = *(toys.optargs++) + 1; } if (TT.signame) { char *arg; int i = strtol(TT.signame, &arg, 10); if (!*arg) arg = num_to_sig(i); else arg = TT.signame; if (!arg || (signum = sig_to_num(arg)) == -1) error_exit("Unknown signal '%s'", arg); } else signum = SIGTERM; } if (!(flag_chk(FLAG_s) || flag_chk(FLAG_P)) && !*toys.optargs) { toys.exithelp++; error_exit("missing argument"); } if (*(toys.optargs+1) && !(flag_chk(FLAG_s) || flag_chk(FLAG_P))) { toys.exithelp++; error_exit("max argument > 1"); } if (*toys.optargs) { /* compile regular expression(PATTERN) */ if ((eval = regcomp(&rp, *toys.optargs, REG_EXTENDED | REG_NOSUB)) != 0) { char errbuf[256]; (void) regerror(eval, &rp, errbuf, sizeof(errbuf)); error_exit("%s", errbuf); } } if (flag_chk(FLAG_s)&&(TT.sid==0)) TT.sid = getsid(0); while ((entry = readdir(dp))) { int fd = -1, n = 0; if (!isdigit(*entry->d_name)) continue; pid = strtol(entry->d_name, NULL, 10); if (pid == self) continue; snprintf(toybuf, sizeof(toybuf), "/proc/%s/cmdline", entry->d_name); if ((fd = open(toybuf, O_RDONLY)) == -1) goto cmdline_fail; n = read(fd, toybuf, sizeof(toybuf)); close(fd); toybuf[n--] = '\0'; if (n < 0) { cmdline_fail: snprintf(toybuf, sizeof(toybuf), "/proc/%s/comm", entry->d_name); if ((fd = open(toybuf, O_RDONLY)) == -1) continue; n = read(fd, toybuf, sizeof(toybuf)); close(fd); toybuf[--n] = '\0'; if (n < 1) continue; } if (flag_chk(FLAG_f)) { while (--n) if (toybuf[n] < ' ') toybuf[n] = ' '; } if (cmdline) free(cmdline); cmdline = xstrdup(toybuf); if (flag_chk(FLAG_s) || flag_chk(FLAG_P)) { snprintf(toybuf, sizeof(toybuf), "/proc/%s/stat", entry->d_name); if ((fd = open(toybuf, O_RDONLY)) == -1) continue; n = read(fd, toybuf, sizeof(toybuf)); close(fd); if (n<1) continue; n = sscanf(toybuf, "%*u %*s %*c %u %*u %u", &ppid, &sid); if (flag_chk(FLAG_s)) if (sid != TT.sid) continue; if (flag_chk(FLAG_P)) if (ppid != TT.ppid) continue; } if (!*toys.optargs || (regex_match(&rp, cmdline, *toys.optargs)^flag_chk(FLAG_v))) { if (flag_chk(FLAG_n)) { if (latest_cmdline) free(latest_cmdline); latest_cmdline = xstrdup(cmdline); latest_pid = pid; } else exec_action(pid, cmdline, signum); ret = 0; if (flag_chk(FLAG_o)) break; } } if (cmdline) free(cmdline); if (latest_cmdline) { exec_action(latest_pid, latest_cmdline, signum); free(latest_cmdline); } if (*toys.optargs) regfree(&rp); closedir(dp); toys.exitval = ret; }