X-Git-Url: https://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?a=blobdiff_plain;f=src%2Fshared%2Futil.c;h=4eb1d27069a59ce0dfe99b4d490dd3c2503ca1be;hb=52306a952075183d4bdb20d9dc446cf26ef3deac;hp=d17359abd0a340fc81706a3777da1a12fb1f65bf;hpb=ad0a762293c307fa9a4bb71afe63168496a4dbb8;p=elogind.git diff --git a/src/shared/util.c b/src/shared/util.c index d17359abd..4eb1d2706 100644 --- a/src/shared/util.c +++ b/src/shared/util.c @@ -93,6 +93,7 @@ #include "random-util.h" #include "terminal-util.h" #include "hostname-util.h" +#include "signal-util.h" /* Put this test here for a lack of better place */ assert_cc(EAGAIN == EWOULDBLOCK); @@ -572,13 +573,12 @@ const char* split(const char **state, size_t *l, const char *separator, bool quo char quotechars[2] = {*current, '\0'}; *l = strcspn_escaped(current + 1, quotechars); - if (current[*l + 1] == '\0' || + if (current[*l + 1] == '\0' || current[*l + 1] != quotechars[0] || (current[*l + 2] && !strchr(separator, current[*l + 2]))) { /* right quote missing or garbage at the end */ *state = current; return NULL; } - assert(current[*l + 1] == quotechars[0]); *state = current++ + *l + 2; } else if (quoted) { *l = strcspn_escaped(current, separator); @@ -751,41 +751,6 @@ int readlink_and_canonicalize(const char *p, char **r) { return 0; } -int reset_all_signal_handlers(void) { - int sig, r = 0; - - for (sig = 1; sig < _NSIG; sig++) { - struct sigaction sa = { - .sa_handler = SIG_DFL, - .sa_flags = SA_RESTART, - }; - - /* These two cannot be caught... */ - if (sig == SIGKILL || sig == SIGSTOP) - continue; - - /* On Linux the first two RT signals are reserved by - * glibc, and sigaction() will return EINVAL for them. */ - if ((sigaction(sig, &sa, NULL) < 0)) - if (errno != EINVAL && r == 0) - r = -errno; - } - - return r; -} - -int reset_signal_mask(void) { - sigset_t ss; - - if (sigemptyset(&ss) < 0) - return -errno; - - if (sigprocmask(SIG_SETMASK, &ss, NULL) < 0) - return -errno; - - return 0; -} - char *strstrip(char *s) { char *e; @@ -1541,59 +1506,6 @@ int flush_fd(int fd) { } } -int sigaction_many(const struct sigaction *sa, ...) { - va_list ap; - int r = 0, sig; - - va_start(ap, sa); - while ((sig = va_arg(ap, int)) > 0) - if (sigaction(sig, sa, NULL) < 0) - r = -errno; - va_end(ap); - - return r; -} - -int ignore_signals(int sig, ...) { - struct sigaction sa = { - .sa_handler = SIG_IGN, - .sa_flags = SA_RESTART, - }; - va_list ap; - int r = 0; - - if (sigaction(sig, &sa, NULL) < 0) - r = -errno; - - va_start(ap, sig); - while ((sig = va_arg(ap, int)) > 0) - if (sigaction(sig, &sa, NULL) < 0) - r = -errno; - va_end(ap); - - return r; -} - -int default_signals(int sig, ...) { - struct sigaction sa = { - .sa_handler = SIG_DFL, - .sa_flags = SA_RESTART, - }; - va_list ap; - int r = 0; - - if (sigaction(sig, &sa, NULL) < 0) - r = -errno; - - va_start(ap, sig); - while ((sig = va_arg(ap, int)) > 0) - if (sigaction(sig, &sa, NULL) < 0) - r = -errno; - va_end(ap); - - return r; -} - void safe_close_pair(int p[]) { assert(p); @@ -1907,35 +1819,6 @@ void rename_process(const char name[8]) { } } -void sigset_add_many(sigset_t *ss, ...) { - va_list ap; - int sig; - - assert(ss); - - va_start(ap, ss); - while ((sig = va_arg(ap, int)) > 0) - assert_se(sigaddset(ss, sig) == 0); - va_end(ap); -} - -int sigprocmask_many(int how, ...) { - va_list ap; - sigset_t ss; - int sig; - - assert_se(sigemptyset(&ss) == 0); - - va_start(ap, how); - while ((sig = va_arg(ap, int)) > 0) - assert_se(sigaddset(&ss, sig) == 0); - va_end(ap); - - if (sigprocmask(how, &ss, NULL) < 0) - return -errno; - - return 0; -} char *lookup_uid(uid_t uid) { long bufsize; char *name; @@ -2324,18 +2207,6 @@ DIR *xopendirat(int fd, const char *name, int flags) { return d; } -int signal_from_string_try_harder(const char *s) { - int signo; - assert(s); - - signo = signal_from_string(s); - if (signo <= 0) - if (startswith(s, "SIG")) - return signal_from_string(s+3); - - return signo; -} - static char *tag_to_udev_node(const char *tagvalue, const char *by) { _cleanup_free_ char *t = NULL, *u = NULL; size_t enc_len; @@ -3292,81 +3163,6 @@ static const char* const ip_tos_table[] = { DEFINE_STRING_TABLE_LOOKUP_WITH_FALLBACK(ip_tos, int, 0xff); -static const char *const __signal_table[] = { - [SIGHUP] = "HUP", - [SIGINT] = "INT", - [SIGQUIT] = "QUIT", - [SIGILL] = "ILL", - [SIGTRAP] = "TRAP", - [SIGABRT] = "ABRT", - [SIGBUS] = "BUS", - [SIGFPE] = "FPE", - [SIGKILL] = "KILL", - [SIGUSR1] = "USR1", - [SIGSEGV] = "SEGV", - [SIGUSR2] = "USR2", - [SIGPIPE] = "PIPE", - [SIGALRM] = "ALRM", - [SIGTERM] = "TERM", -#ifdef SIGSTKFLT - [SIGSTKFLT] = "STKFLT", /* Linux on SPARC doesn't know SIGSTKFLT */ -#endif - [SIGCHLD] = "CHLD", - [SIGCONT] = "CONT", - [SIGSTOP] = "STOP", - [SIGTSTP] = "TSTP", - [SIGTTIN] = "TTIN", - [SIGTTOU] = "TTOU", - [SIGURG] = "URG", - [SIGXCPU] = "XCPU", - [SIGXFSZ] = "XFSZ", - [SIGVTALRM] = "VTALRM", - [SIGPROF] = "PROF", - [SIGWINCH] = "WINCH", - [SIGIO] = "IO", - [SIGPWR] = "PWR", - [SIGSYS] = "SYS" -}; - -DEFINE_PRIVATE_STRING_TABLE_LOOKUP(__signal, int); - -const char *signal_to_string(int signo) { - static thread_local char buf[sizeof("RTMIN+")-1 + DECIMAL_STR_MAX(int) + 1]; - const char *name; - - name = __signal_to_string(signo); - if (name) - return name; - - if (signo >= SIGRTMIN && signo <= SIGRTMAX) - snprintf(buf, sizeof(buf), "RTMIN+%d", signo - SIGRTMIN); - else - snprintf(buf, sizeof(buf), "%d", signo); - - return buf; -} - -int signal_from_string(const char *s) { - int signo; - int offset = 0; - unsigned u; - - signo = __signal_from_string(s); - if (signo > 0) - return signo; - - if (startswith(s, "RTMIN+")) { - s += 6; - offset = SIGRTMIN; - } - if (safe_atou(s, &u) >= 0) { - signo = (int) u + offset; - if (signo > 0 && signo < _NSIG) - return signo; - } - return -EINVAL; -} - bool kexec_loaded(void) { bool loaded = false; char *s; @@ -5815,6 +5611,71 @@ int fd_setcrtime(int fd, usec_t usec) { return 0; } +int same_fd(int a, int b) { + struct stat sta, stb; + pid_t pid; + int r, fa, fb; + + assert(a >= 0); + assert(b >= 0); + + /* Compares two file descriptors. Note that semantics are + * quite different depending on whether we have kcmp() or we + * don't. If we have kcmp() this will only return true for + * dup()ed file descriptors, but not otherwise. If we don't + * have kcmp() this will also return true for two fds of the same + * file, created by separate open() calls. Since we use this + * call mostly for filtering out duplicates in the fd store + * this difference hopefully doesn't matter too much. */ + + if (a == b) + return true; + + /* Try to use kcmp() if we have it. */ + pid = getpid(); + r = kcmp(pid, pid, KCMP_FILE, a, b); + if (r == 0) + return true; + if (r > 0) + return false; + if (errno != ENOSYS) + return -errno; + + /* We don't have kcmp(), use fstat() instead. */ + if (fstat(a, &sta) < 0) + return -errno; + + if (fstat(b, &stb) < 0) + return -errno; + + if ((sta.st_mode & S_IFMT) != (stb.st_mode & S_IFMT)) + return false; + + /* We consider all device fds different, since two device fds + * might refer to quite different device contexts even though + * they share the same inode and backing dev_t. */ + + if (S_ISCHR(sta.st_mode) || S_ISBLK(sta.st_mode)) + return false; + + if (sta.st_dev != stb.st_dev || sta.st_ino != stb.st_ino) + return false; + + /* The fds refer to the same inode on disk, let's also check + * if they have the same fd flags. This is useful to + * distinguish the read and write side of a pipe created with + * pipe(). */ + fa = fcntl(a, F_GETFL); + if (fa < 0) + return -errno; + + fb = fcntl(b, F_GETFL); + if (fb < 0) + return -errno; + + return fa == fb; +} + int chattr_fd(int fd, unsigned value, unsigned mask) { unsigned old_attr, new_attr; struct stat st;