Add dontthrow attribute to most libc functions

This will help C++ code that uses exceptions to be tinier. For example,
this change shaves away 1000 lines of assembly code from LLVM's libcxx,
which is 0.7% of all assembly instructions in the entire library.

libc/calls/struct/cpuset.h

@@ -9,33 +9,33 @@ typedef struct cpu_set_t {
   uint64_t __bits[16];
 } cpu_set_t;
 
-int sched_getcpu(void);
-int sched_getaffinity(int, size_t, cpu_set_t *);
-int sched_setaffinity(int, size_t, const cpu_set_t *);
+int sched_getcpu(void) libcesque;
+int sched_getaffinity(int, size_t, cpu_set_t *) libcesque;
+int sched_setaffinity(int, size_t, const cpu_set_t *) libcesque;
 
 #define CPU_SET(i, s)   ((s)->__bits[(i) / 64] |= 1ull << ((i) % 64))
 #define CPU_CLR(i, s)   ((s)->__bits[(i) / 64] &= ~(1ull << ((i) % 64)))
 #define CPU_ISSET(i, s) (!!((s)->__bits[(i) / 64] & (1ull << ((i) % 64))))
 
-void CPU_ZERO(cpu_set_t *);
+void CPU_ZERO(cpu_set_t *) libcesque;
 #define CPU_ZERO(x) CPU_ZERO(x)
 
-int CPU_COUNT(cpu_set_t *);
+int CPU_COUNT(cpu_set_t *) libcesque;
 #define CPU_COUNT(x) CPU_COUNT(x)
 
-int CPU_EQUAL(cpu_set_t *, cpu_set_t *);
+int CPU_EQUAL(cpu_set_t *, cpu_set_t *) libcesque;
 #define CPU_EQUAL(x, y) CPU_EQUAL(x, y)
 
-void CPU_AND(cpu_set_t *, cpu_set_t *, cpu_set_t *);
+void CPU_AND(cpu_set_t *, cpu_set_t *, cpu_set_t *) libcesque;
 #define CPU_AND(x, y, z) CPU_AND(x, y, z)
 
-void CPU_OR(cpu_set_t *, cpu_set_t *, cpu_set_t *);
+void CPU_OR(cpu_set_t *, cpu_set_t *, cpu_set_t *) libcesque;
 #define CPU_OR(x, y, z) CPU_OR(x, y, z)
 
-void CPU_XOR(cpu_set_t *, cpu_set_t *, cpu_set_t *);
+void CPU_XOR(cpu_set_t *, cpu_set_t *, cpu_set_t *) libcesque;
 #define CPU_XOR(x, y, z) CPU_XOR(x, y, z)
 
-int CPU_COUNT_S(size_t, const cpu_set_t *);
+int CPU_COUNT_S(size_t, const cpu_set_t *) libcesque;
 #define CPU_COUNT_S(x, y) CPU_COUNT_S(x, y)
 
 #define CPU_ALLOC_SIZE(n) \

libc/calls/struct/dirent.h

@@ -13,19 +13,19 @@ struct dirent {      /* linux getdents64 abi */
 struct dirstream;
 typedef struct dirstream DIR;
 
-DIR *fdopendir(int) __wur;
-DIR *opendir(const char *) __wur;
-int closedir(DIR *);
-int dirfd(DIR *);
-long telldir(DIR *);
-struct dirent *readdir(DIR *);
-int readdir_r(DIR *, struct dirent *, struct dirent **);
-void rewinddir(DIR *);
-void seekdir(DIR *, long);
-int alphasort(const struct dirent **, const struct dirent **);
-int versionsort(const struct dirent **, const struct dirent **);
+DIR *fdopendir(int) libcesque __wur;
+DIR *opendir(const char *) libcesque __wur;
+int closedir(DIR *) libcesque;
+int dirfd(DIR *) libcesque;
+long telldir(DIR *) libcesque;
+struct dirent *readdir(DIR *) libcesque;
+int readdir_r(DIR *, struct dirent *, struct dirent **) libcesque;
+void rewinddir(DIR *) libcesque;
+void seekdir(DIR *, long) libcesque;
+int alphasort(const struct dirent **, const struct dirent **) libcesque;
+int versionsort(const struct dirent **, const struct dirent **) libcesque;
 int scandir(const char *, struct dirent ***, int (*)(const struct dirent *),
-            int (*)(const struct dirent **, const struct dirent **));
+            int (*)(const struct dirent **, const struct dirent **)) libcesque;
 
 COSMOPOLITAN_C_END_
 #endif /* COSMOPOLITAN_LIBC_CALLS_STRUCT_DIRENT_H_ */

libc/calls/struct/iovec.h

@@ -7,11 +7,11 @@ struct iovec {
   size_t iov_len;
 };
 
-ssize_t preadv(int, struct iovec *, int, int64_t);
-ssize_t pwritev(int, const struct iovec *, int, int64_t);
-ssize_t readv(int, const struct iovec *, int);
-ssize_t vmsplice(int, const struct iovec *, int64_t, uint32_t);
-ssize_t writev(int, const struct iovec *, int);
+ssize_t preadv(int, struct iovec *, int, int64_t) libcesque;
+ssize_t pwritev(int, const struct iovec *, int, int64_t) libcesque;
+ssize_t readv(int, const struct iovec *, int) libcesque;
+ssize_t vmsplice(int, const struct iovec *, int64_t, uint32_t) libcesque;
+ssize_t writev(int, const struct iovec *, int) libcesque;
 
 COSMOPOLITAN_C_END_
 #endif /* COSMOPOLITAN_LIBC_CALLS_STRUCT_IOVEC_H_ */

libc/calls/struct/rlimit.h

@@ -7,8 +7,8 @@ struct rlimit {
   uint64_t rlim_max; /* maximum limit in bytes */
 };
 
-int getrlimit(int, struct rlimit *);
-int setrlimit(int, const struct rlimit *);
+int getrlimit(int, struct rlimit *) libcesque;
+int setrlimit(int, const struct rlimit *) libcesque;
 
 COSMOPOLITAN_C_END_
 #endif /* COSMOPOLITAN_LIBC_CALLS_STRUCT_RLIMIT_H_ */

libc/calls/struct/rusage.h

@@ -22,10 +22,10 @@ struct rusage {
   int64_t ru_nivcsw;       /* involuntary context switches */
 };
 
-int getrusage(int, struct rusage *);
-int wait3(int *, int, struct rusage *);
-int wait4(int, int *, int, struct rusage *);
-void rusage_add(struct rusage *, const struct rusage *);
+int getrusage(int, struct rusage *) libcesque;
+int wait3(int *, int, struct rusage *) libcesque;
+int wait4(int, int *, int, struct rusage *) libcesque;
+void rusage_add(struct rusage *, const struct rusage *) libcesque;
 
 COSMOPOLITAN_C_END_
 #endif /* COSMOPOLITAN_LIBC_CALLS_STRUCT_RUSAGE_H_ */

libc/calls/struct/sched_param.h

@@ -7,13 +7,13 @@ struct sched_param {
   int32_t sched_priority;
 };
 
-int sched_get_priority_max(int);
-int sched_get_priority_min(int);
-int sched_getparam(int, struct sched_param *);
-int sched_getscheduler(int);
-int sched_rr_get_interval(int, struct timespec *);
-int sched_setparam(int, const struct sched_param *);
-int sched_setscheduler(int, int, const struct sched_param *);
+int sched_get_priority_max(int) libcesque;
+int sched_get_priority_min(int) libcesque;
+int sched_getparam(int, struct sched_param *) libcesque;
+int sched_getscheduler(int) libcesque;
+int sched_rr_get_interval(int, struct timespec *) libcesque;
+int sched_setparam(int, const struct sched_param *) libcesque;
+int sched_setscheduler(int, int, const struct sched_param *) libcesque;
 
 COSMOPOLITAN_C_END_
 #endif /* COSMOPOLITAN_LIBC_CALLS_STRUCT_SCHED_PARAM_H_ */

libc/calls/struct/sigaction.h

@@ -17,8 +17,8 @@ struct sigaction {
   sigset_t sa_mask;
 };
 
-sighandler_t signal(int, sighandler_t);
-int sigaction(int, const struct sigaction *, struct sigaction *);
+sighandler_t signal(int, sighandler_t) libcesque;
+int sigaction(int, const struct sigaction *, struct sigaction *) libcesque;
 
 COSMOPOLITAN_C_END_
 #endif /* COSMOPOLITAN_LIBC_CALLS_STRUCT_SIGACTION_H_ */

libc/calls/struct/sigaltstack.h

@@ -10,7 +10,7 @@ struct sigaltstack {
 
 typedef struct sigaltstack stack_t;
 
-int sigaltstack(const struct sigaltstack *, struct sigaltstack *);
+int sigaltstack(const struct sigaltstack *, struct sigaltstack *) libcesque;
 
 COSMOPOLITAN_C_END_
 #endif /* COSMOPOLITAN_LIBC_CALLS_STRUCT_SIGALTSTACK_H_ */

libc/calls/struct/siginfo.h

@@ -57,8 +57,8 @@ struct siginfo {
 typedef struct siginfo siginfo_t;
 
 #ifdef _COSMO_SOURCE
-void __minicrash(int, siginfo_t *, void *);
-char __is_stack_overflow(siginfo_t *, void *);
+void __minicrash(int, siginfo_t *, void *) libcesque;
+char __is_stack_overflow(siginfo_t *, void *) libcesque;
 #endif
 
 COSMOPOLITAN_C_END_

libc/calls/struct/statfs.h

@@ -20,8 +20,8 @@ struct statfs {       /* cosmo abi */
   char f_fstypename[16];
 };
 
-int statfs(const char *, struct statfs *);
-int fstatfs(int, struct statfs *);
+int statfs(const char *, struct statfs *) libcesque;
+int fstatfs(int, struct statfs *) libcesque;
 
 COSMOPOLITAN_C_END_
 #endif /* COSMOPOLITAN_LIBC_CALLS_STRUCT_STATFS_H_ */

libc/calls/struct/sysinfo.h

@@ -19,7 +19,7 @@ struct sysinfo {
   uint32_t mem_unit;  /* ram stuff above is multiples of this */
 };
 
-int sysinfo(struct sysinfo *);
+int sysinfo(struct sysinfo *) libcesque;
 
 COSMOPOLITAN_C_END_
 #endif /* COSMOPOLITAN_LIBC_CALLS_STRUCT_SYSINFO_H_ */

libc/calls/struct/timespec.h

@@ -8,35 +8,38 @@ struct timespec {
   int64_t tv_nsec; /* nanoseconds */
 };
 
-int clock_getres(int, struct timespec *);
-int clock_gettime(int, struct timespec *);
-int clock_settime(int, const struct timespec *);
+int clock_getres(int, struct timespec *) libcesque;
+int clock_gettime(int, struct timespec *) libcesque;
+int clock_settime(int, const struct timespec *) libcesque;
 int clock_nanosleep(int, int, const struct timespec *, struct timespec *);
-int futimens(int, const struct timespec[2]);
-int nanosleep(const struct timespec *, struct timespec *);
-int utimensat(int, const char *, const struct timespec[2], int);
-int timespec_getres(struct timespec *, int);
-int timespec_get(struct timespec *, int);
+int futimens(int, const struct timespec[2]) libcesque;
+int nanosleep(const struct timespec *, struct timespec *) libcesque;
+int utimensat(int, const char *, const struct timespec[2], int) libcesque;
+int timespec_getres(struct timespec *, int) libcesque;
+int timespec_get(struct timespec *, int) libcesque;
 
 #ifdef _COSMO_SOURCE
 /* cosmopolitan libc's non-posix timespec library
    removed by default due to emacs codebase clash */
 #define timespec_zero ((struct timespec){0})
 #define timespec_max  ((struct timespec){0x7fffffffffffffff, 999999999})
-int timespec_cmp(struct timespec, struct timespec) pureconst;
-int64_t timespec_tomicros(struct timespec) pureconst;
-int64_t timespec_tomillis(struct timespec) pureconst;
-int64_t timespec_tonanos(struct timespec) pureconst;
-struct timespec timespec_add(struct timespec, struct timespec) pureconst;
-struct timespec timespec_fromnanos(int64_t) pureconst;
-struct timespec timespec_frommicros(int64_t) pureconst;
-struct timespec timespec_frommillis(int64_t) pureconst;
-struct timespec timespec_real(void);
-struct timespec timespec_mono(void);
-struct timespec timespec_sleep(struct timespec);
-int timespec_sleep_until(struct timespec);
-struct timespec timespec_sub(struct timespec, struct timespec) pureconst;
-struct timespec timespec_subz(struct timespec, struct timespec) pureconst;
+libcesque int timespec_cmp(struct timespec, struct timespec) pureconst;
+libcesque int64_t timespec_tomicros(struct timespec) pureconst;
+libcesque int64_t timespec_tomillis(struct timespec) pureconst;
+libcesque int64_t timespec_tonanos(struct timespec) pureconst;
+libcesque struct timespec timespec_add(struct timespec,
+                                       struct timespec) pureconst;
+libcesque struct timespec timespec_fromnanos(int64_t) pureconst;
+libcesque struct timespec timespec_frommicros(int64_t) pureconst;
+libcesque struct timespec timespec_frommillis(int64_t) pureconst;
+libcesque struct timespec timespec_real(void) libcesque;
+libcesque struct timespec timespec_mono(void) libcesque;
+libcesque struct timespec timespec_sleep(struct timespec) libcesque;
+libcesque int timespec_sleep_until(struct timespec) libcesque;
+libcesque struct timespec timespec_sub(struct timespec,
+                                       struct timespec) pureconst;
+libcesque struct timespec timespec_subz(struct timespec,
+                                        struct timespec) pureconst;
 int sys_futex(int *, int, int, const struct timespec *, int *);
 static inline struct timespec timespec_fromseconds(int64_t __x) {
   return (struct timespec){__x};

libc/calls/struct/tms.h

@@ -9,7 +9,7 @@ struct tms {
   int64_t tms_cstime; /* children kernelspace time */
 };
 
-long times(struct tms *);
+long times(struct tms *) libcesque;
 
 COSMOPOLITAN_C_END_
 #endif /* COSMOPOLITAN_LIBC_CALLS_STRUCT_TMS_H_ */

libc/calls/struct/utsname.h

@@ -14,7 +14,7 @@ struct utsname {             /* cosmo abi */
   char domainname[SYS_NMLN]; /* domain name */
 };
 
-int uname(struct utsname *);
+int uname(struct utsname *) libcesque;
 
 COSMOPOLITAN_C_END_
 #endif /* COSMOPOLITAN_LIBC_CALLS_STRUCT_UTSNAME_H_ */