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//采用linux原函数 #include "apue.h" #define BUFFSIZE 1024 #include <limits.h> #include <signal.h> #include <stdlib.h> #include <stdio.h> #include <string.h> #include "sig2str.h" #ifndef SIGRTMIN # define SIGRTMIN 0 # undef SIGRTMAX #endif #ifndef SIGRTMAX # define SIGRTMAX (SIGRTMIN - 1) #endif #define NUMNAME(name) { SIG##name, #name } //需要有个地方定义相应信号常量，比如：#define SIGHUP 1 /* Signal names and numbers. Put the preferred name first. */ static struct numname { int num; char const name[8]; } numname_table[] = { /* Signals required by POSIX 1003.1-2001 base, listed in traditional numeric order. */ #ifdef SIGHUP NUMNAME (HUP), #endif #ifdef SIGINT NUMNAME (INT), #endif #ifdef SIGQUIT NUMNAME (QUIT), #endif #ifdef SIGILL NUMNAME (ILL), #endif #ifdef SIGTRAP NUMNAME (TRAP), #endif #ifdef SIGABRT NUMNAME (ABRT), #endif #ifdef SIGFPE NUMNAME (FPE), #endif #ifdef SIGKILL NUMNAME (KILL), #endif #ifdef SIGBUS NUMNAME (BUS), #endif #ifdef SIGSEGV NUMNAME (SEGV), #endif #ifdef SIGPIPE NUMNAME (PIPE), #endif #ifdef SIGALRM NUMNAME (ALRM), #endif #ifdef SIGTERM NUMNAME (TERM), #endif #ifdef SIGUSR1 NUMNAME (USR1), #endif #ifdef SIGUSR2 NUMNAME (USR2), #endif #ifdef SIGCHLD NUMNAME (CHLD), #endif #ifdef SIGURG NUMNAME (URG), #endif #ifdef SIGSTOP NUMNAME (STOP), #endif #ifdef SIGTSTP NUMNAME (TSTP), #endif #ifdef SIGCONT NUMNAME (CONT), #endif #ifdef SIGTTIN NUMNAME (TTIN), #endif #ifdef SIGTTOU NUMNAME (TTOU), #endif /* Signals required by POSIX 1003.1-2001 with the XSI extension. */ #ifdef SIGSYS NUMNAME (SYS), #endif #ifdef SIGPOLL NUMNAME (POLL), #endif #ifdef SIGVTALRM NUMNAME (VTALRM), #endif #ifdef SIGPROF NUMNAME (PROF), #endif #ifdef SIGXCPU NUMNAME (XCPU), #endif #ifdef SIGXFSZ NUMNAME (XFSZ), #endif /* Unix Version 7. */ #ifdef SIGIOT NUMNAME (IOT), /* Older name for ABRT. */ #endif #ifdef SIGEMT NUMNAME (EMT), #endif /* USG Unix. */ #ifdef SIGPHONE NUMNAME (PHONE), #endif #ifdef SIGWIND NUMNAME (WIND), #endif /* Unix System V. */ #ifdef SIGCLD NUMNAME (CLD), #endif #ifdef SIGPWR NUMNAME (PWR), #endif /* GNU/Linux 2.2 and Solaris 8. */ #ifdef SIGCANCEL NUMNAME (CANCEL), #endif #ifdef SIGLWP NUMNAME (LWP), #endif #ifdef SIGWAITING NUMNAME (WAITING), #endif #ifdef SIGFREEZE NUMNAME (FREEZE), #endif #ifdef SIGTHAW NUMNAME (THAW), #endif #ifdef SIGLOST NUMNAME (LOST), #endif #ifdef SIGWINCH NUMNAME (WINCH), #endif /* GNU/Linux 2.2. */ #ifdef SIGINFO NUMNAME (INFO), #endif #ifdef SIGIO NUMNAME (IO), #endif #ifdef SIGSTKFLT NUMNAME (STKFLT), #endif /* AIX 5L. */ #ifdef SIGDANGER NUMNAME (DANGER), #endif #ifdef SIGGRANT NUMNAME (GRANT), #endif #ifdef SIGMIGRATE NUMNAME (MIGRATE), #endif #ifdef SIGMSG NUMNAME (MSG), #endif #ifdef SIGPRE NUMNAME (PRE), #endif #ifdef SIGRETRACT NUMNAME (RETRACT), #endif #ifdef SIGSAK NUMNAME (SAK), #endif #ifdef SIGSOUND NUMNAME (SOUND), #endif /* Older AIX versions. */ #ifdef SIGALRM1 NUMNAME (ALRM1), /* unknown; taken from Bash 2.05 */ #endif #ifdef SIGKAP NUMNAME (KAP), /* Older name for SIGGRANT. */ #endif #ifdef SIGVIRT NUMNAME (VIRT), /* unknown; taken from Bash 2.05 */ #endif #ifdef SIGWINDOW NUMNAME (WINDOW), /* Older name for SIGWINCH. */ #endif /* BeOS */ #ifdef SIGKILLTHR NUMNAME (KILLTHR), #endif /* Older HP-UX versions. */ #ifdef SIGDIL NUMNAME (DIL), #endif /* Korn shell and Bash, of uncertain vintage. */ { 0, "EXIT" } }; #define NUMNAME_ENTRIES (sizeof numname_table / sizeof numname_table[0]) /* ISDIGIT differs from isdigit, as follows: - Its arg may be any int or unsigned int; it need not be an unsigned char or EOF. - It's typically faster. POSIX says that only '0' through '9' are digits. Prefer ISDIGIT to isdigit unless it's important to use the locale's definition of `digit' even when the host does not conform to POSIX. */ #define ISDIGIT(c) ((unsigned int) (c) - '0' <= 9) /* Convert the signal name SIGNAME to a signal number. Return the signal number if successful, -1 otherwise. */ static int str2signum (char const *signame) { if (ISDIGIT (*signame)) //如果signame的第一个字符是数字 { char *endp; long int n = strtol (signame, &endp, 10); //把signame转化为数字 if (! *endp && n <= SIGNUM_BOUND) return n; } else { unsigned int i; for (i = 0; i < NUMNAME_ENTRIES; i++) if (strcmp (numname_table[i].name, signame) == 0) return numname_table[i].num; { char *endp; int rtmin = SIGRTMIN; int rtmax = SIGRTMAX; if (0 < rtmin && strncmp (signame, "RTMIN", 5) == 0) { long int n = strtol (signame + 5, &endp, 10); if (! *endp && 0 <= n && n <= rtmax - rtmin) return rtmin + n; } else if (0 < rtmax && strncmp (signame, "RTMAX", 5) == 0) { long int n = strtol (signame + 5, &endp, 10); if (! *endp && rtmin - rtmax <= n && n <= 0) return rtmax + n; } } } return -1; } /* Convert the signal name SIGNAME to the signal number *SIGNUM. Return 0 if successful, -1 otherwise. */ int str2sig (char const *signame, int *signum) { *signum = str2signum (signame); return *signum < 0 ? -1 : 0; } /* Convert SIGNUM to a signal name in SIGNAME. SIGNAME must point to a buffer of at least SIG2STR_MAX bytes. Return 0 if successful, -1 otherwise. */ int sig2str (int signum, char *signame) { unsigned int i; for (i = 0; i < NUMNAME_ENTRIES; i++) if (numname_table[i].num == signum) { strcpy (signame, numname_table[i].name); //printf("signame = %s\n",signame); return 0; } { int rtmin = SIGRTMIN; int rtmax = SIGRTMAX; if (! (rtmin <= signum && signum <= rtmax)) return -1; if (signum <= rtmin + (rtmax - rtmin) / 2) { int delta = signum - rtmin; //printf("delta1 = %d\n",delta); sprintf (signame, delta ? "RTMIN+%d" : "RTMIN", delta); //printf("signame1 = %s\n",signame); } else { int delta = rtmax - signum; //printf("delta2 = %d\n",delta); sprintf (signame, delta ? "RTMAX-%d" : "RTMAX", delta); //printf("signame2 = %s\n",signame); } return 0; } } int main(void) { printf("SIGRTMIN=%d\n",SIGRTMIN); //34 printf("SIGRTMAX=%d\n",SIGRTMAX); //64 int signo; str2sig("11",&signo); //如果输入的是数字，则返回输入数字 printf("SIG no =%d\n",signo); str2sig("HUP",&signo); //如果输入的是信号名，则返回相应信号no printf("SIGHUP no =%d\n",signo); str2sig("USR1",&signo); printf("SIGUSR1 no =%d\n",signo); str2sig("SAK",&signo); printf("SIGSAK no =%d\n",signo); str2sig("RTMIN",&signo); //如果输入的是信号量界限，则返回信号量界限 printf("SIGRTMIN no =%d\n",signo); char temp[BUFFSIZE]; sig2str(63,temp); //测试上限 printf("temsignal = %s\n",temp); sig2str(35,temp); //测试下限 printf("temsignal = %s\n",temp); sig2str(34,temp); //测试下限 printf("temsignal = %s\n",temp); sig2str(32,temp); //测试正常值 printf("temsignal = %s\n",temp); sig2str(1,temp); printf("temsignal = %s\n",temp); sig2str(10,temp); printf("temsignal = %s\n",temp); int i =0; /* for(i; i<NUMNAME_ENTRIES; i++ ){ printf("the %d sig :%d,%s\n",i,numname_table[i].num,numname_table[i].name); } */ return 0; }
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